LT6230/LT6230-10 LT6231/LT6232 215MHz, Rail-to-Rail Output, 1.1nV/Hz, 3.5mA Op Amp Family Features Description Low Noise Voltage: 1.1nV/Hz n Low Supply Current: 3.5mA/Amp Max n Low Offset Voltage: 350V Max n Gain Bandwidth Product: LT6230: 215MHz; AV 1 LT6230-10: 1450MHz; AV 10 n Wide Supply Range: 3V to 12.6V n Output Swings Rail-to-Rail n Common Mode Rejection Ratio: 115dB Typ n Output Current: 30mA n Operating Temperature Range: -40C to 85C n LT6230 Shutdown to 10A Maximum n LT6230/LT6230-10 in a Low Profile (1mm) ThinSOTTM Package n Dual LT6231 in 8-Pin SO and Tiny DFN Packages n LT6232 in a 16-Pin SSOP Package The LT(R)6230/LT6231/LT6232 are single/dual/quad low noise, rail-to-rail output unity-gain stable op amps that feature 1.1nV/Hz noise voltage and draw only 3.5mA of supply current per amplifier. These amplifiers combine very low noise and supply current with a 215MHz gainbandwidth product, a 70V/s slew rate and are optimized for low supply voltage signal conditioning systems. The LT6230-10 is a single amplifier optimized for higher gain applications resulting in higher gain bandwidth and slew rate. The LT6230 and LT6230-10 include an enable pin that can be used to reduce the supply current to less than 10A. n Applications n n n n n Ultrasound Amplifiers Low Noise, Low Power Signal Processing Active Filters Driving A/D Converters Rail-to-Rail Buffer Amplifiers The amplifier family has an output that swings within 50mV of either supply rail to maximize the signal dynamic range in low supply applications and is specified on 3.3V, 5V and 5V supplies. The en * ISUPPLY product of 1.9 per amplifier is among the most noise efficient of any op amp. The LT6230/LT6230-10 are available in the 6-lead SOT23 package and the LT6231 dual is available in the 8-pin SO package with standard pinouts. For compact layouts, the dual is also available in a tiny dual fine pitch leadless package (DFN). The LT6232 is available in the 16-pin SSOP package. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical Application Noise Voltage and Unbalanced Noise Current vs Frequency Low Noise Low Power Instrumentation Amplifier 6 + R4 499 1/2 LT6231 - + LT6202 R3 196 - 1/2 LT6231 + VS- 5 VS+ R2 196 R1 10 IN- R6 499 VOUT - R5 499 VS- R7 499 NOISE VOLTAGE (nV/Hz) IN+ VS = 2.5V TA = 25C VCM = 0V 4 6 5 4 3 NOISE CURRENT 2 3 2 1 NOISE VOLTAGE 1 623012 TA01a AV = 40 BW = 5.1MHz VS = 1.5V to 5V IS = 10mA EN = 5.8VRMS INPUT REFERRED, MEASUREMENT BW = 8MHz 0 10 100 1k 10k FREQUENCY (Hz) UNBALANCED NOISE CURRENT (pA/Hz) VS+ 0 100k 623012 TA01b 623012fc 1 LT6230/LT6230-10 LT6231/LT6232 Absolute Maximum Ratings (Note 1) Total Supply Voltage (V+ to V-)............................... 12.6V Input Current (Note 2).......................................... 40mA Output Short-Circuit Duration (Note 3)............. Indefinite Operating Temperature Range (Note 4)....-40C to 85C Specified Temperature Range (Note 5).....-40C to 85C Junction Temperature............................................ 150C Junction Temperature (DD Package)..................... 125C Storage Temperature Range................... -65C to 150C Storage Temperature Range (DD Package)......................................... -65C to 125C Lead Temperature (Soldering, 10 sec).................... 300C Pin Configuration TOP VIEW TOP VIEW 6 V+ OUT 1 V- 2 5 ENABLE +IN 3 4 -IN S6 PACKAGE 6-LEAD PLASTIC TSOT-23 TJMAX = 150C, JA = 250C/W OUT A 1 -IN A 2 +IN A 3 V- 4 - + - + 8 V+ 7 OUT B 6 -IN B 5 +IN B DD PACKAGE 8-LEAD (3mm x 3mm) PLASTIC DFN TJMAX = 125C, JA = 160C/W UNDERSIDE METAL CONNECTED TO V- (PCB CONNECTION OPTIONAL) TOP VIEW OUT A 1 -IN A 2 +IN A 3 V- 4 - + - + 8 V+ 7 OUT B V 6 -IN B +IN B 5 +IN B -IN B 6 5 S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 150C, JA = 200C/W +IN A 3 + - + A 15 -IN D 14 +IN D D 4 OUT B 7 NC 8 OUT D - -IN A 2 OUT A 1 16 + TOP VIEW 13 V + -B + C- - 12 +IN C 11 -IN C 10 OUT C 9 NC GN PACKAGE 16-LEAD NARROW PLASTIC SSOP TJMAX = 150C, JA = 135C/W 623012fc 2 LT6230/LT6230-10 LT6231/LT6232 Order Information LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LT6230CS6#PBF LT6230CS6#TRPBF LTAFJ 6-Lead Plastic TS0T-23 0C to 70C LT6230IS6#PBF LT6230IS6#TRPBF LTAFJ 6-Lead Plastic TS0T-23 -40C to 85C LT6230CS6-10#PBF LT6230CS6-10#TRPBF LTAFK 6-Lead Plastic TS0T-23 0C to 70C LT6230IS6-10#PBF LT6230IS6-10#TRPBF LTAFK 6-Lead Plastic TS0T-23 -40C to 85C LT6231CS8#PBF LT6230CS8#TRPBF 6231 8-Lead Plastic SO 0C to 70C LT6231IS8#PBF LT6230IS8#TRPBF 6231I 8-Lead Plastic SO -40C to 85C LT6231CDD#PBF LT6231CDD#TRPBF LAEU 8-Lead (3mm x 3mm) Plastic DFN 0C to 70C LT6231IDD#PBF LT6231IDD#TRPBF LAEU 8-Lead (3mm x 3mm) Plastic DFN -40C to 85C LT6232CGN#PBF LT6232CGN#TRPBF 6232 16-Lead Narrow Plastic SSOP 0C to 70C LT6232IGN#PBF LT6232IGN#TRPBF 6232I 16-Lead Narrow Plastic SSOP -40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ Electrical Characteristics ENABLE = 0V, unless otherwise noted. SYMBOL PARAMETER VOS Input Offset Voltage TA = 25C, VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply, CONDITIONS MIN LT6230S6, LT6230S6-10 LT6231S8, LT6232GN LT6231DD Input Offset Voltage Match (Channel-to-Channel) (Note 6) IB IOS Input Bias Current TYP MAX UNITS 100 50 75 500 350 450 V V V 100 600 V 5 10 A IB Match (Channel-to-Channel) (Note 6) 0.1 0.9 A Input Offset Current 0.1 0.6 A 1.7 nV/Hz Input Noise Voltage 0.1Hz to 10Hz 180 en Input Noise Voltage Density f = 10kHz, VS = 5V 1.1 nVP-P in Input Noise Current Density, Balanced Source Input Noise Current Density, Unbalanced Source f = 10kHz, VS = 5V, RS = 10k f = 10kHz, VS = 5V, RS = 10k 1 2.4 pA/Hz pA/Hz Input Resistance Common Mode Differential Mode 6.5 7.5 M k CIN Input Capacitance Common Mode Differential Mode 2.9 7.7 pF pF AVOL Large-Signal Gain VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS/2 VS = 5V, VO = 0.5V to 4.5V, RL = 1k to VS/2 VS = 5V, VO = 1V to 4V, RL = 100 to VS/2 105 21 5.4 200 40 9 V/mV V/mV V/mV VS = 3.3V, VO = 0.65V to 2.65V, RL = 10k to VS/2 VS = 3.3V, VO = 0.65V to 2.65V, RL = 1k to VS/2 90 16.5 175 32 V/mV V/mV 1.5 1.15 VCM Input Voltage Range Guaranteed by CMRR, VS = 5V, 0V Guaranteed by CMRR, VS = 3.3V, 0V CMRR Common Mode Rejection Ratio VS = 5V, VCM = 1.5V to 4V VS = 3.3V, VCM = 1.15V to 2.65V 90 90 115 115 dB dB CMRR Match (Channel-to-Channel) (Note 6) VS = 5V, VCM = 1.5V to 4V 84 120 dB 4 2.65 V V 623012fc 3 LT6230/LT6230-10 LT6231/LT6232 Electrical Characteristics ENABLE = 0V, unless otherwise noted. TA = 25C, VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply, SYMBOL PARAMETER CONDITIONS MIN TYP PSRR Power Supply Rejection Ratio VS = 3V to 10V 90 115 dB PSRR Match (Channel-to-Channel) (Note 6) VS = 3V to 10V 84 115 dB Minimum Supply Voltage (Note 7) MAX 3 UNITS V VOL Output Voltage Swing Low (Note 8) No Load ISINK = 5mA VS = 5V, ISINK = 20mA VS = 3.3V, ISINK = 15mA 4 85 240 185 40 190 460 350 mV mV mV mV VOH Output Voltage Swing High (Note 8) No Load ISOURCE = 5mA VS = 5V, ISOURCE = 20mA VS = 3.3V, ISOURCE = 15mA 5 90 325 250 50 200 600 400 mV mV mV mV ISC Short-Circuit Current VS = 5V VS = 3.3V IS Supply Current per Amplifier Disabled Supply Current per Amplifier ENABLE = V+ - 0.35V 3.15 0.2 3.5 10 mA A IENABLE ENABLE Pin Current ENABLE = 0.3V -25 -75 A VL ENABLE Pin Input Voltage Low 0.3 V 10 A VH 30 25 45 40 mA mA V+ - 0.35V ENABLE Pin Input Voltage High V Output Leakage Current ENABLE = V+ - 0.35V, VO = 1.5V to 3.5V 0.2 tON Turn-On Time ENABLE = 5V to 0V, RL = 1k, VS = 5V 300 tOFF Turn-Off Time ENABLE = 0V to 5V, RL = 1k, VS = 5V GBW Gain-Bandwidth Product Frequency = 1MHz, VS = 5V LT6230-10 SR Slew Rate VS = 5V, A V = -1, RL = 1k, VO = 1.5V to 3.5V 41 42 LT6230-10, VS = 5V, AV = -10, RL = 1k, VO = 1.5V to 3.5V 4.8 ns s 200 1300 MHz MHz 60 V/s 250 V/s 6.3 MHz FPBW Full-Power Bandwidth VS = 5V, VOUT = 3VP-P (Note 9) LT6230-10, HD2 = HD3 = 1% 11 MHz tS Settling Time (LT6230, LT6231, LT6232) 0.1%, VS = 5V, VSTEP = 2V, AV = -1, RL = 1k 55 ns 623012fc 4 LT6230/LT6230-10 LT6231/LT6232 Electrical Characteristics The l denotes the specifications which apply over the 0C < TA < 70C temperature range. VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply, ENABLE = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage LT6230CS6, LT6230CS6-10 LT6231CS8, LT6232CGN LT6231CDD MIN Input Offset Voltage Match (Channel-to-Channel) (Note 6) VOS TC IB Input Offset Voltage Drift (Note 10) V V V l 800 V 0.5 l 3 V/C l 11 A l 1 A Input Offset Current Large-Signal Gain Input Voltage Range Common Mode Rejection Ratio 0.7 l VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS/2 VS = 5V, VO = 0.5V to 4.5V, RL = 1k to VS/2 VS = 5V, VO = 1V to 4V, RL = 100 to VS/2 A l l l 78 17 4.1 V/mV V/mV V/mV VS = 3.3V, VO = 0.65V to 2.65V, RL = 10k to VS/2 l VS = 3.3V, VO = 0.65V to 2.65V, RL = 1k to VS/2 l 66 13 V/mV V/mV Guaranteed by CMRR VS = 5V, 0V Vs = 3.3V, 0V l l 1.5 1.15 VS = 5V, VCM = 1.5V to 4V VS = 3.3V, VCM = 1.15V to 2.65V l l 90 85 dB dB l 84 dB CMRR Match (Channel-to-Channel) (Note 6) VS = 5V, VCM = 1.5V to 4V PSRR UNIT 600 450 550 Input Bias Current AVOL CMRR TYP IB Match (Channel-to-Channel) (Note 6) IOS VCM VCM = Half Supply MAX l l l 4 2.65 V V Power Supply Rejection Ratio VS = 3V to 10V l 85 dB PSRR Match (Channel-to-Channel) (Note 6) VS = 3V to 10V l 79 dB l 3 Minimum Supply Voltage (Note 7) V VOL Output Voltage Swing Low (Note 8) No Load ISINK = 5mA VS = 5V, ISINK = 20mA VS = 3.3V, ISINK = 15mA l l l l 50 200 500 380 mV mV mV mV VOH Output Voltage Swing High (Note 8) No Load ISOURCE = 5mA VS = 5V, ISOURCE = 20mA VS = 3.3V, ISOURCE = 15mA l l l l 60 215 650 430 mV mV mV mV ISC Short-Circuit Current VS = 5V VS = 3.3V l l IS Supply Current per Amplifier Disabled Supply Current per Amplifier ENABLE = V+ - 0.25V l l IENABLE ENABLE Pin Current ENABLE = 0.3V VL ENABLE Pin Input Voltage Low VH ENABLE Pin Input Voltage High 25 20 mA mA 4.2 mA A l -85 A l 0.3 V l 1 V+ - 0.25V V Output Leakage Current ENABLE = V+ - 0.25V, V l 1 A tON Turn-On Time ENABLE = 5V to 0V, RL = 1k, VS = 5V l 300 ns tOFF Turn-Off Time ENABLE = 0V to 5V, RL = 1k, VS = 5V l 65 s SR Slew Rate VS = 5V, AV = -1, RL = 1k, VO = 1.5V to 3.5V l 225 V/s O = 1.5V to 3.5V 35 LT6230-10, AV = -10, RL = 1k, VO = 1.5V to 3.5V l FPBW Full-Power Bandwidth (Note 9) VS = 5V, VOUT = 3VP-P; LT6230C, LT6231C, LT6232C l 3.7 V/s MHz 623012fc 5 LT6230/LT6230-10 LT6231/LT6232 Electrical Characteristics The l denotes the specifications which apply over the -40C < TA < 85C temperature range. VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply, ENABLE = 0V, unless otherwise noted. (Note 5) SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage LT6230IS6, LT6230IS6-10 LT6231IS8, LT6232IGN LT6231IDD Input Offset Voltage Match (Channel-to-Channel) (Note 6) VOS TC Input Offset Voltage Drift (Note 10) IB Input Bias Current VCM = Half Supply MIN MAX UNITS l l l 700 550 650 V V V l 1000 V 3 V/C l 12 A 1.1 A 0.8 A IB Match (Channel-to-Channel) (Note 6) IOS Input Offset Current l AVOL Large-Signal Gain Input Voltage Range VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS/2 VS = 5V, VO = 0.5V to 4.5V, RL = 1k to VS/2 VS = 5V, VO = 1V to 4V, RL = 100 to VS/2 l l l 72 16 3.6 V/mV V/mV V/mV VS = 3.3V, VO = 0.65V to 2.65V, RL = 10k to VS/2 VS = 3.3V, VO = 0.65V to 2.65V, RL = 1k to VS/2 l l 60 12 V/mV V/mV Guaranteed by CMRR VS = 5V, 0V VS = 3.3V, 0V l l 1.5 1.15 VS = 5V, VCM = 1.5V to 4V VS = 3.3V, VCM = 1.15V to 2.65V l l 90 85 dB dB l 84 dB l 85 dB l 79 dB l 3 V CMRR Common Mode Rejection Ratio PSRR CMRR Match (Channel-to-Channel) (Note 6) VS = 5V, VCM = 1.5V to 4V Power Supply Rejection Ratio VS = 3V to 10V PSRR Match (Channel-to-Channel) (Note 6) 0.5 l l VCM TYP VS = 3V to 10V Minimum Supply Voltage (Note 7) 4 2.65 V V VOL Output Voltage Swing Low (Note 8) No Load ISINK = 5mA VS = 5V, ISINK = 15mA VS = 3.3V, ISINK = 15mA l l l l 60 210 510 390 mV mV mV mV VOH Output Voltage Swing High (Note 6) No Load ISOURCE = 5mA VS = 5V, ISOURCE = 20mA VS = 3.3V, ISOURCE = 15mA l l l l 70 220 675 440 mV mV mV mV ISC Short-Circuit Current VS = 5V VS = 3.3V l l IS Supply Current per Amplifier Disabled Supply Current per Amplifier ENABLE = V+ - 0.2V l l IENABLE ENABLE Pin Current ENABLE = 0.3V VL VH 15 15 mA mA 4.4 mA A l -100 A ENABLE Pin Input Voltage Low l 0.3 ENABLE Pin Input Voltage High l V+ - 0.2V 1 V V Output Leakage Current ENABLE = V+ - 0.2V, VO = 1.5V to 3.5V l 1 A tON Turn-On Time ENABLE = 5V to 0V, RL = 1k, VS = 5V l 300 ns tOFF Turn-Off Time ENABLE = 0V to 5V, RL = 1k, VS = 5V l 72 s SR Slew Rate VS = 5V, AV = -1, RL = 1k, VO = 1.5V to 3.5V l LT6230-10, AV = -10, RL = 1k, VO = 1.5V to 3.5V l VS = 5V, VOUT = 3VP-P; LT6230I, LT6231I, LT6232I l FPBW Full-Power Bandwidth (Note 9) 31 V/s 185 3.3 V/s MHz 623012fc 6 LT6230/LT6230-10 LT6231/LT6232 Electrical Characteristics TA = 25C, VS = 5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage LT6230, LT6230-10 LT6231S8, LT6232GN LT6231DD MIN Input Offset Voltage Match (Channel-to-Channel) (Note 6) IB Input Bias Current IB Match (Channel-to-Channel) (Note 6) IOS Input Offset Current TYP MAX UNITS 100 50 75 500 350 450 V V V 100 600 V 5 10 A 0.1 0.9 A 0.1 0.6 A Input Noise Voltage 0.1Hz to 10Hz 180 en Input Noise Voltage Density f = 10kHz 1.1 in Input Noise Current Density, Balanced Source Input Noise Current Density, Unbalanced Source f = 10kHz, RS = 10k f = 10kHz, RS = 10k 1 2.4 pA/Hz pA/Hz Input Resistance Common Mode Differential Mode 6.5 7.5 M k CIN Input Capacitance Common Mode Differential Mode 2.4 6.5 pF pF AVOL Large-Signal Gain VO = 4.5V, RL = 10k VO = 4.5V, RL = 1k VO = 2V, RL = 100 260 65 16 V/mV V/mV V/mV VCM Input Voltage Range Guaranteed by CMRR -3 CMRR Common Mode Rejection Ratio VCM = -3V to 4V 95 140 35 8.5 nVP-P 1.7 4 120 nV/Hz V dB CMRR Match (Channel-to-Channel) (Note 6) VCM = -3V to 4V 89 125 dB PSRR Power Supply Rejection Ratio VS = 1.5V to 5V 90 115 dB PSRR Match (Channel-to-Channel) (Note 6) VS = 1.5V to 5V 84 115 VOL Output Voltage Swing Low (Note 8) No Load ISINK = 5mA ISINK = 20mA 4 85 240 40 190 460 mV mV mV VOH Output Voltage Swing High (Note 8) No Load ISOURCE = 5mA ISOURCE = 20mA 5 90 325 50 200 600 mV mV mV ISC Short-Circuit Current IS Supply Current per Amplifier Disabled Supply Current per Amplifier ENABLE = 4.65V 3.3 0.2 3.9 mA A IENABLE ENABLE Pin Current ENABLE = 0.3V -35 -85 A VL ENABLE Pin Input Voltage Low 0.3 V VH ENABLE Pin Input Voltage High 10 A dB 30 mA 4.65 V Output Leakage Current ENABLE = V+ - 4.65V, VO = 1V 0.2 tON Turn-On Time ENABLE = 5V to 0V, RL = 1k 300 ns tOFF Turn-Off Time ENABLE = 0V to 5V, RL = 1k 62 s GBW Gain-Bandwidth Product Frequency = 1MHz LT6230-10 SR Slew Rate AV = -1, RL = 1k, VO = -2V to 2V 150 1000 50 LT6230-10, AV = -10, RL = 1k, VO = -2V to 2V FPBW tS Full-Power Bandwidth Settling Time (LT6230, LT6231, LT6232) VOUT = 3VP-P (Note 9) 5.3 215 1450 MHz MHz 70 V/s 320 V/s 7.4 MHz LT6230-10, HD2 = HD3 1% 11 MHz 0.1%, VSTEP = 2V, AV = -1, RL = 1k 50 ns 623012fc 7 LT6230/LT6230-10 LT6231/LT6232 Electrical Characteristics The l denotes the specifications which apply over the 0C < TA < 70C temperature range. VS = 5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage LT6230CS6, LT6230CS6-10 LT6231CS8, LT6232CGN LT6231CDD MIN TYP MAX UNITS l l l 600 450 550 V V V Input Offset Voltage Match (Channel-to-Channel) (Note 6) l 800 V VOS TC Input Offset Voltage Drift (Note 10) l IB Input Bias Current l IB Match (Channel-to-Channel) (Note 6) IOS Input Offset Current AVOL Large-Signal Gain 0.5 3 V/C 11 A l 1 A l 0.7 A VO = 4.5V, RL = 10k VO = 4.5V, RL = 1k VO = 2V, RL = 100 l l l 100 27 6 V/mV V/mV V/mV VCM Input Voltage Range Guaranteed by CMRR l -3 CMRR Common Mode Rejection Ratio VCM = -3V to 4V l 95 dB CMRR Match (Channel-to-Channel) (Note 6) VCM = -3V to 4V l 89 dB Power Supply Rejection Ratio VS = 1.5V to 5V l 85 dB PSRR Match (Channel-to-Channel) (Note 6) VS = 1.5V to 5V l 79 dB VOL Output Voltage Swing Low (Note 8) No Load ISINK = 5mA ISINK = 20mA l l l 50 200 500 mV mV mV VOH Output Voltage Swing High (Note 8) No Load ISOURCE = 5mA ISOURCE = 20mA l l l 60 215 650 mV mV mV ISC Short-Circuit Current IS Supply Current per Amplifier Disabled Supply Current per Amplifier ENABLE = 4.75V l l ENABLE = 0.3V PSRR IENABLE ENABLE Pin Current VL ENABLE Pin Input Voltage Low VH ENABLE Pin Input Voltage High tON l mA mA A l -95 A l 0.3 V l Output Leakage Current ENABLE = 4.75V, VO = 1V l Turn-On Time ENABLE = 5V to 0V, RL = 1k l Turn-Off Time ENABLE = 0V to 5V, RL = 1k l SR Slew Rate AV = -1, RL = 1k, VO = -2V to 2V l LT6230-10, AV = -10, RL = 1k, VO = -2V to 2V l VOUT = 3VP-P (Note 9) LT6230C, LT6231C, LT6232C l Full-Power Bandwidth 25 V 4.6 tOFF FPBW 4 1 4.75 V 1 A 300 ns 85 44 315 4.66 s V/s V/s MHz 623012fc 8 LT6230/LT6230-10 LT6231/LT6232 Electrical Characteristics The l denotes the specifications which apply over the -40C < TA < 85C temperature range. VS = 5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted. (Note 5) SYMBOL PARAMETER CONDITIONS MIN VOS Input Offset Voltage LT6230I, LT6230I-10 LT6231IS8, LT6232IGN LT6231IDD TYP MAX UNITS l l l 700 550 650 V V V Input Offset Voltage Match (Channel-to-Channel) (Note 6) l 1000 V VOS TC Input Offset Voltage Drift (Note 10) l 3 V/C IB Input Bias Current l 12 A IB Match (Channel-to-Channel) (Note 6) l 1.1 A IOS Input Offset Current l 0.8 A AVOL Large-Signal Gain 0.5 VO = 4.5V, RL = 10k VO = 4.5V, RL = 1k VO = 1.5V, RL = 100 l l l 93 25 4.8 V/mV V/mV V/mV VCM Input Voltage Range Guaranteed by CMRR l -3 CMRR Common Mode Rejection Ratio VCM = -3V to 4V l 95 dB CMRR Match (Channel-to-Channel) (Note 6) VCM = -3V to 4V l 89 dB 85 dB 79 dB 4 V Power Supply Rejection Ratio VS = 1.5V to 5V l PSRR Match (Channel-to-Channel) (Note 6) VS = 1.5V to 5V l VOL Output Voltage Swing Low (Note 8) No Load ISINK = 5mA ISINK = 15mA l l l 60 210 510 mV mV mV VOH Output Voltage Swing High (Note 8) No Load ISOURCE = 5mA ISOURCE = 20mA l l l 70 220 675 mV mV mV ISC Short-Circuit Current IS Supply Current per Amplifier Disabled Supply Current per Amplifier ENABLE = 4.8V l l IENABLE ENABLE Pin Current ENABLE = 0.3V VL ENABLE Pin Input Voltage Low VH ENABLE Pin Input Voltage High l PSRR l mA A l -110 A l 0.3 V Output Leakage Current ENABLE = 4.8V, VO = 1V tON Turn-On Time ENABLE = 5V to 0V, RL = 1k l tOFF Turn-Off Time ENABLE = 0V to 5V, RL = 1k l SR Slew Rate AV = -1, RL = 1k, VO = -2V to 2V l LT6230-10, AV = -10, RL = 1k, VO = -2V to 2V l VOUT = 3VP-P; LT6230I, LT6231I, LT6232I l Full-Power Bandwidth (Note 9) Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: Inputs are protected by back-to-back diodes. If the differential input voltage exceeds 0.7V, the input current must be limited to less than 40mA. Note 3: A heat sink may be required to keep the junction temperature below the absolute maximum rating when the output is shorted indefinitely. mA 4.85 l FPBW 15 1 4.8 V 1 A 300 ns 72 37 260 3.9 s V/s V/s MHz Note 4: The LT6230C/LT6230I the LT6231C/LT6231I, and LT6232C/LT6232I are guaranteed functional over the temperature range of -40C and 85C. Note 5: The LT6230C/LT6231C/LT6232C are guaranteed to meet specified performance from 0C to 70C. The LT6230C/LT6231C/LT6232C are designed, characterized and expected to meet specified performance from -40C to 85C, but are not tested or QA sampled at these temperatures. The LT6230I/LT6231I/LT6232I are guaranteed to meet specified performance from -40C to 85C. 623012fc 9 LT6230/LT6230-10 LT6231/LT6232 Electrical Characteristics Note 6: Matching parameters are the difference between the two amplifiers A and D and between B and C of the LT6232; between the two amplifiers of the LT6231. CMRR and PSRR match are defined as follows: CMRR and PSRR are measured in V/V on the matched amplifiers. The difference is calculated between the matching sides in V/V. The result is converted to dB. Note 7: Minimum supply voltage is guaranteed by power supply rejection ratio test. Note 8: Output voltage swings are measured between the output and power supply rails. Note 9: Full-power bandwidth is calculated from the slew rate: FPBW = SR/2VP Note 10: This parameter is not 100% tested. Typical Performance Characteristics (LT6230/LT6231/LT6232) Supply Current vs Supply Voltage (Per Amplifier) VOS Distribution 6 100 2.0 60 50 40 30 20 4 TA = 125C 3 TA = 25C 2 TA = -55C 1 10 0 50 100 150 200 -200 -150 -100 -50 0 INPUT OFFSET VOLTAGE (V) 0 10 0 2 4 8 10 12 6 TOTAL SUPPLY VOLTAGE (V) TA = -55C TA = 125C TA = 25C 2 0 4 5 3 2 COMMON MODE VOLTAGE (V) 1 6 623012 GO4 TA = 25C TA = 125C 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 INPUT COMMON MODE VOLTAGE (V) Output Saturation Voltage vs Load Current (Output Low) 10 VS = 5V, 0V 8 7 VCM = 4V 6 VCM = 1.5V 5 4 0 TA = -55C -1.0 623012 GO3 OUTPUT SATURATION VOLTAGE (V) 10 -1 -0.5 -2.0 14 9 INPUT BIAS CURRENT (A) INPUT BIAS CURRENT (A) 12 4 0 Input Bias Current vs Temperature VS = 5V, 0V 6 0.5 623012 GO2 Input Bias Current vs Common Mode Voltage 8 1.0 -1.5 623012 GO1 -2 OFFSET VOLTAGE (mV) 70 VS = 5V, 0V 1.5 5 SUPPLY CURRENT (mA) NUMBER OF UNITS VS = 5V, 0V + 90 VCM = V /2 S8 80 14 Offset Voltage vs Input Common Mode Voltage 3 -50 -25 0 50 75 25 TEMPERATURE (C) 100 125 623012 GO5 VS = 5V, 0V 1 TA = 125C 0.1 TA = -55C 0.01 0.001 TA = 25C 0.01 10 0.1 1 LOAD CURRENT (mA) 100 623012 GO6 623012fc 10 LT6230/LT6230-10 LT6231/LT6232 Typical Performance Characteristics (LT6230/LT6231/LT6232) Output Saturation Voltage vs Load Current (Output High) 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 TOTAL SUPPLY VOLTAGE (V) 70 60 SINKING TA = 125C 50 40 TA = 25C 30 20 TA = -55C 10 0 -10 SOURCING TA = 125C -20 TA = -55C -30 -40 -50 TA = 25C -60 -70 2 2.5 3.5 4 4.5 5 3 1.5 POWER SUPPLY VOLTAGE (V) 623012 G08 623012 GO9 1.0 VCM = VS/2 0.8 0.6 1 TA = 125C 0.1 TA = -55C TA = 25C 0.01 0.4 0.2 0 -0.2 TA = -55C -0.4 TA = 125C -0.6 TA = 25C -0.8 0.001 0.01 0.1 1 10 LOAD CURRENT (mA) -1.0 100 623012 G07 Open-Loop Gain 2.5 Open-Loop Gain 2.5 VS = 3V, 0V TA = 25C 2.0 0.5 RL = 1k 0 RL = 100 -0.5 -1.0 1.5 INPUT VOLTAGE (mV) 1.0 1.0 0.5 RL = 1k 0 RL = 100 -0.5 -1.0 1.0 0.5 -0.5 -1.5 -1.5 -2.0 -2.0 -2.5 -2.5 2.5 3 623012 G10 1.0 30 VS = 5V TA = -55C 0.5 0 -0.5 TA = 25C TA = 125C -1.0 -1.5 26 100 VS = 5V 24 22 VS = 2.5V 20 VS = 1.5V 18 5 Total Noise vs Total Source Resistance TA = 25C 28 4 623012 G12 Warm-Up Drift vs Time CHANGE IN OFFSET VOLTAGE (V) 1.5 -5 -4 -3 -2 -1 0 1 2 3 OUTPUT VOLTAGE (V) 623012 G11 Offset Voltage vs Output Current 2.0 -2.5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 OUTPUT VOLTAGE (V) TOTAL NOISE (nV/Hz) 1 1.5 2 OUTPUT VOLTAGE (V) RL = 100 -1.0 -2.0 0.5 RL = 1k 0 -1.5 0 VS = 5V TA = 25C 2.0 1.5 INPUT VOLTAGE (mV) INPUT VOLTAGE (mV) Open-Loop Gain 2.5 VS = 5V, 0V TA = 25C 2.0 1.5 OFFSET VOLTAGE (mV) OUTPUT SHORT-CIRCUIT CURRENT (mA) VS = 5V, 0V OFFSET VOLTAGE (mV) OUTPUT SATURATION VOLTAGE (V) 10 Output Short-Circuit Current vs Power Supply Voltage Minimum Supply Voltage 16 VS = 2.5V VCM = 0V f = 100kHz UNBALANCED SOURCE 10 RESISTORS TOTAL NOISE RESISTOR NOISE 1 AMPLIFIER NOISE VOLTAGE 14 12 -2.0 -75 -60 -45 -30 -15 0 15 30 45 60 75 OUTPUT CURRENT (mA) 623012 G13 10 0 20 40 60 80 100 120 140 160 TIME AFTER POWER-UP (s) 623012 G14 0.1 10 100 1k 10k SOURCE RESISTANCE () 100k 623012 G15 623012fc 11 LT6230/LT6230-10 LT6231/LT6232 Typical Performance Characteristics (LT6230/LT6231/LT6232) Noise Voltage and Unbalanced Noise Current vs Frequency 4 3 3 NOISE CURRENT 2 2 1 1 100 10 CL = 5pF RL = 1k VCM = VS/2 100nV -100nV PHASE GAIN (dB) VS = 5V 40 30 20 20 0 VS = 5V 10 -20 GAIN 0 -40 VS = 3V, 0V -10 -20 100k 1M 10M 100M FREQUENCY (Hz) 1G 40 220 200 GAIN BANDWIDTH 180 160 -80 140 95 AV = 2 AV = 1 0.1 100M 623012 G22 125 120 AV = -1 110 RF = RG = 1k 100 VS = 5V FALLING 90 80 VS = 5V RISING 70 60 VS = 2.5V FALLING 50 VS = 2.5V RISING 40 30 2 0 10 12 8 6 TOTAL SUPPLY VOLTAGE (V) 4 20 -55 -35 -15 14 5 25 45 65 85 105 125 TEMPERATURE (C) 623012 G21 Common Mode Rejection Ratio vs Frequency Channel Separation vs Frequency -40 100 CHANNEL SEPARATION (dB) AV = 10 1M 10M FREQUENCY (Hz) 65 35 5 TEMPERATURE (C) 623012 G20 COMMON MODE REJECTION RATIO (dB) 100 OUTPUT IMPEDANCE () 50 240 -60 VS = 5V, 0V 0.01 100k -25 623012 G18 120 1 GAIN BANDWIDTH Slew Rate vs Temperature PHASE MARGIN Output Impedance vs Frequency 10 VS = 3V, 0V 180 60 623012 G19 1k 200 PHASE MARGIN (DEG) 40 60 PHASE (dB) VS = 3V, 0V 220 70 TA = 25C CL = 5pF RL = 1k GAIN BANDWIDTH (MHz) CL = 5pF RL = 1k 100 VCM = VS/2 80 50 40 VS = 5V Gain Bandwidth and Phase Margin vs Supply Voltage 120 60 240 623012 G17 Open-Loop Gain vs Frequency 70 50 140 -55 5s/DIV 623012 G16 80 60 VS = 5V 160 0 100k 1k 10k FREQUENCY (Hz) 70 PHASE MARGIN VS = 3V, 0V SLEW RATE (V/s) 0 NOISE VOLTAGE VS = 2.5V PHASE MARGIN (DEG) 4 Gain Bandwidth and Phase Margin vs Temperature GAIN BANDWIDTH (MHz) 5 UNBALANCED NOISE CURRENT (pA/Hz) 5 NOISE VOLTAGE (nV/Hz) 6 VS = 2.5V TA = 25C VCM = 0V 100nV/DIV 6 0.1Hz to 10Hz Output Voltage Noise 80 60 40 20 VS = 5V, 0V VCM = VS/2 0 10k 100k AV = 1 -50 TA = 25C VS = 5V -60 -70 -80 -90 -100 -110 -120 -130 1M 10M FREQUENCY (Hz) 100M 1G 623012 G23 -140 100k 1M 10M FREQUENCY (Hz) 100M 623012 G24 623012fc 12 LT6230/LT6230-10 LT6231/LT6232 Typical Performance Characteristics (LT6230/LT6231/LT6232) Power Supply Rejection Ratio vs Frequency VS = 5V, 0V TA = 25C VCM = VS/2 80 POSITIVE SUPPLY 60 NEGATIVE SUPPLY 40 50 50 40 40 VS = 5V, 0V 45 AV = 2 35 RS = 10 30 25 RS = 20 20 15 RS = 50 RL = 50 10 20 OVERSHOOT (%) 100 1M 100k FREQUENCY (Hz) 10k 10M 100M 100 CAPACITIVE LOAD (pF) 10 - VOUT 500 100 1mV 1mV 50 0 -4 -3 500 150 2 1 0 OUTPUT STEP (V) -2 -1 - VIN VOUT + 100 1mV 1mV 50 10mV 10mV 10mV 3 0 4 -4 -3 10mV -2 -1 1 2 0 OUTPUT STEP (V) Distortion vs Frequency RL = 100, 2ND RL = 1k, 2ND -90 -70 -80 100k 1M FREQUENCY (Hz) AV = -1 9 AV = 2 8 7 6 5 4 V = 5V 3 T S = 25C A HD2, HD3 < -40dBc 2 100k 1M 10k FREQUENCY (Hz) 623012 G30 Distortion vs Frequency VS = 2.5V AV = 2 -50 VOUT = 2VP-P RL = 100, 3RD RL = 100, 2ND RL = 1k, 2ND 10M -70 623012 G31 RL = 100, 2ND -80 RL = 1k, 2ND -90 100k 1M FREQUENCY (Hz) 10M 623012 G32 RL = 100, 3RD -60 RL = 1k, 3RD -100 10k 10M -40 -90 RL = 1k, 3RD -100 10k 4 DISTORTION (dBc) DISTORTION (dBc) -80 3 VS = 5V AV = 1 -50 VOUT = 2VP-P -60 1000 10 -40 VS = 2.5V AV = 1 -50 VOUT = 2VP-P -70 100 CAPACITIVE LOAD (pF) 623012 G27 Distortion vs Frequency -40 RL = 100, 3RD 10 623012 G29 623012 G28 -60 RS = 50 RL = 50 Maximum Undistorted Output Signal vs Frequency VS = 5V TA = 25C AV = -1 500 SETTLING TIME (ns) SETTLING TIME (ns) 200 + 15 Settling Time vs Output Step (Inverting) VS = 5V TA = 25C AV = 1 VIN 20 623012 G26 Settling Time vs Output Step (Noninverting) 150 RS = 20 25 0 1000 623012 G25 200 30 5 OUTPUT VOLTAGE SWING (VP-P) 1k 0 RS = 10 35 10 5 0 DISTORTION (dBc) Series Output Resistance and Overshoot vs Capacitive Load VS = 5V, 0V 45 AV = 1 OVERSHOOT (%) POWER SUPPLY REJECTION RATIO (dB) 120 Series Output Resistance and Overshoot vs Capacitive Load -100 10k RL = 1k, 3RD 100k 1M FREQUENCY (Hz) 10M 623012 G33 623012fc 13 LT6230/LT6230-10 LT6231/LT6232 Typical Performance Characteristics (LT6230/LT6231/LT6232) Distortion vs Frequency Large-Signal Response Small-Signal Response -40 2V RL = 100, 2ND RL = 1k, 3RD -70 50mV/DIV -60 RL = 100, 3RD 1V/DIV DISTORTION (dBc) VS = 5V AV = 2 -50 VOUT = 2VP-P 0V 0V -2V -80 -90 RL = 1k, 2ND -100 10k 100k 1M FREQUENCY (Hz) 10M 623012 G35 200ns/DIV VS = 2.5V AV = -1 RL = 1k VS = 2.5V AV = 1 RL = 1k 200ns/DIV 623012 G36 623012 G34 2V/DIV 5V 0V -5V VS = 5V AV = 1 RL = 1k VIN 1V/DIV Output Overdrive Recovery 0V VOUT 2V/DIV Large-Signal Response 0V 623012 G37 200ns/DIV VS = 2.5V AV = 3 200ns/DIV 623012 G38 (LT6230) ENABLE Characteristics ENABLE Pin Current vs ENABLE Pin Voltage 4.5 30 TA = 125C 25 TA = 25C 3.0 2.5 TA = -55C 2.0 1.5 1.0 0.5 0 TA = -55C VS = 2.5V AV = 1 20 TA = 25C 15 T = 125C A VOUT 3.5 ENABLE PIN CURRENT (A) SUPPLY CURRENT (mA) 4.0 ENABLE Pin Response Time 10 5 VS = 2.5V -2.0 0 1.0 -1.0 PIN VOLTAGE (V) 2.0 623012 G39 ENABLE PIN Supply Current vs ENABLE Pin Voltage 0 -2.0 0 1.0 -1.0 PIN VOLTAGE (V) 2.0 5V 0V 0.5V 0V VS = 2.5V VIN = 0.5V AV = 1 RL = 1k 100s/DIV 623012 G41 623012 G40 623012fc 14 LT6230/LT6230-10 LT6231/LT6232 Typical Performance Characteristics (LT6230-10) Gain Bandwidth and Phase Margin vs Temperature 600 1100 VS = 3V, 0V 900 80 VS = 5V 70 PHASE MARGIN 60 -50 -25 0 50 75 25 TEMPERATURE (C) 100 400 VS = 5V RISING 300 40 100 -55 -35 -15 PHASE 20 1M -20 VS = 5V AV = 10 CL = 5pF RL = 1k VCM = VS/2 -10 100k 0 -40 TA = 25C AV = 10 1450 CL = 5pF RL = 1k 1200 GAIN BANDWIDTH 950 100 PHASE MARGIN 50 -60 10M 100M FREQUENCY (Hz) 1G -80 0 2 4 8 10 6 TOTAL SUPPLY VOLTAGE (V) 623012 G45 60 40 20 100k 1M 10M FREQUENCY (Hz) 100M 800 600 400 200 0 0 0 1G 623012 G48 -40 VS = 2.5V AV = 10 -50 VOUT = 2VP-P 9 8 7 6 5 4 3 2 VS = 5V TA = 25C 1 AV = 10 HD2 = HD3 40dBc 0 100k 1M 10M 10k FREQUENCY (Hz) 1000 400 800 600 TOTAL RESISTOR LOAD () (INCLUDES FEEDBACK R) 623012 G47 200 2nd and 3rd Harmonic Distortion vs Frequency 10 OUTPUT VOLTAGE SWING (VP-P) COMMON MODE REJECTION RATIO (dB) 80 0 10k 1000 Maximum Undistorted Output Signal vs Frequency VS = 5V, 0V VCM = VS/2 100 12 1200 623012 G46 Common Mode Rejection Ratio vs Frequency 120 ASV = 5V 10 V TA = 25C RF = 1k RG = 100 1400 DISTORTION (dBc) 0 20 GAIN BANDWIDTH (MHz) GAIN (dB) 40 VS = 3V, 0V 30 60 10000 Gain Bandwidth vs Resistor Load 1600 PHASE MARGIN (DEG) 40 80 PHASE (DEG) GAIN 50 10 100 VS = 3V, 0V 100 1000 CAPACITIVE LOAD (pF) 10 623012 G44 1700 120 60 0 5 25 45 65 85 105 125 TEMPERATURE (C) Gain Bandwidth and Phase Margin vs Supply Voltage 90 VS = 5V RS = 50 20 623012 G43 Open-Loop Gain and Phase vs Frequency 70 30 10 623012 G42 80 RS = 20 40 VS = 2.5V FALLING 150 RS = 10 50 VS = 2.5V RISING 200 125 VS = 5V FALLING 350 250 VS = 5V, 0V AV = 10 60 450 50 VS = 3V, 0V 70 OVERSHOOT (%) GAIN BANDWIDTH 1300 PHASE MARGIN (DEG) GAIN BANDWIDTH (MHz) AV = -10 550 RF = 1k RG = 100W 500 VS = 5V GAIN BANDWIDTH (MHz) AV = 10 1500 SLEW RATE (V/s) 1700 Series Output Resistor and Overshoot vs Capacitive Load Slew Rate vs Temperature -60 -70 -80 RL = 100, 2ND RL = 100, 3RD RL = 1k, 3RD RL = 1k, 2ND -90 100M 623012 G49 -100 10k 100k 1M FREQUENCY (Hz) 10M 623012 G50 623012fc 15 LT6230/LT6230-10 LT6231/LT6232 Typical Performance Characteristics (LT6230-10) 2nd and 3rd Harmonic Distortion vs Frequency Large-Signal Response Output-Overload Recovery -40 RL = 100, 3RD RL = 100, 2ND -70 0V RL = 1k, 3RD -80 RL = 1k, 2ND -90 -100 10k VIN VOUT 0.5V/DIV 2V/DIV -60 VOUT 2V/DIV DISTORTION (dBc) VS = 5V AV = 10 -50 VOUT = 2VP-P 100k 1M FREQUENCY (Hz) 10M VS = 5V AV = 10 RF = 900 RG = 100 623012 G52 100ns/DIV 0V 0V VS = 5V, 0V AV = 10 RF = 900 RG = 100 100ns/DIV 623012 G53 623012 G51 Input Referred High Frequency Noise Spectrum Small-Signal Response 1nV/Hz/DIV VOUT 100mV/DIV 10 2.5V VS = 5V, 0V AV = 10 RF = 900 RG = 100 100ns/DIV 623012 G54 0 100kHz 5MHz/DIV 50MHz 623012 G55 623012fc 16 LT6230/LT6230-10 LT6231/LT6232 Applications Information Amplifier Characteristics be limited to 40mA. This implies 25 of protection resistance is necessary per volt of overdrive beyond 0.7V. These input diodes are rugged enough to handle transient currents due to amplifier slew rate overdrive and clipping without protection resistors. Figure 1 is a simplified schematic of the LT6230/LT6231/ LT6232, which has a pair of low noise input transistors Q1 and Q2. A simple current mirror, Q3/Q4, converts the differential signal to a single-ended output, and these transistors are degenerated to reduce their contribution to the overall noise. The photo of Figure 2 shows the output response to an input overdrive with the amplifier connected as a voltage follower. With the input signal low, current source I1 saturates and the differential drive generator drives Q6 into saturation so the output voltage swings all the way to V-. The input can swing positive until transistor Q2 saturates into current mirror Q3/Q4. When saturation occurs, the output tries to phase invert, but diode D2 conducts current from the signal source to the output through the feedback connection. The output is clamped a diode drop below the input. In this photo, the input signal generator is limiting at about 20mA. Capacitor C1 reduces the unity-cross frequency and improves the frequency stability without degrading the gain bandwidth of the amplifier. Capacitor CM sets the overall amplifier gain bandwidth. The differential drive generator supplies current to transistors Q5 and Q6 that swing the output from rail-to-rail. Input Protection There are back-to-back diodes, D1 and D2 across the + and - inputs of these amplifiers to limit the differential input voltage to 0.7V. The inputs of the LT6230/LT6231/LT6232 do not have internal resistors in series with the input transistors. This technique is often used to protect the input devices from overvoltage that causes excessive current to flow. The addition of these resistors would significantly degrade the low noise voltage of these amplifiers. For instance, a 100 resistor in series with each input would generate 1.8nV/Hz of noise, and the total amplifier noise voltage would rise from 1.1nV/Hz to 2.1nV/Hz. Once the input differential voltage exceeds 0.7V, steady-state current conducted through the protection diodes should 1V/DIV 2.5V 0V -2.5V 500s/DIV 623012 F02 Figure 2. VS = 2.5V, AV = 1 with Large Overdrive +V Q3 -V +V DESD1 Q4 C1 DESD2 Q1 D1 DESD5 VOUT DESD6 DIFFERENTIAL DRIVE GENERATOR -V -VIN Q5 CM +V -V Q2 Q6 D2 +V +VIN DESD3 DESD4 -V I1 BIAS ENABLE +V -V 623012 F01 Figure 1. Simplified Schematic 623012fc 17 LT6230/LT6230-10 LT6231/LT6232 Applications Information With the amplifier connected in a gain of AV 2, the output can invert with very heavy overdrive. To avoid this inversion, limit the input overdrive to 0.5V beyond the power supply rails. ESD The LT6230/LT6231/LT6232 have reverse-biased ESD protection diodes on all inputs and outputs as shown in Figure 1. If these pins are forced beyond either supply, unlimited current will flow through these diodes. If the current is transient and limited to one hundred milliamps or less, no damage to the device will occur. Noise The noise voltage of the LT6230/LT6231/LT6232 is equivalent to that of a 75 resistor, and for the lowest possible noise it is desirable to keep the source and feedback resistance at or below this value, i.e., RS + RG||RFB 75. With RS + RG||RFB = 75 the total noise of the amplifier is: eN=(1.1nV)2+(1.1nV)2 = 1.55nV/Hz Below this resistance value, the amplifier dominates the noise, but in the region between 75 and about 3k, the noise is dominated by the resistor thermal noise. As the total resistance is further increased beyond 3k, the amplifier noise current multiplied by the total resistance eventually dominates the noise. The product of eN * ISUPPLY is an interesting way to gauge low noise amplifiers. Most low noise amplifiers with low eN have high ISUPPLY current. In applications that require low noise voltage with the lowest possible supply current, this product can prove to be enlightening. The LT6230/LT6231/LT6232 have an eN * ISUPPLY product of only 1.9 per amplifier, yet it is common to see amplifiers with similar noise specifications to have eN * ISUPPLY as high as 13.5. For a complete discussion of amplifier noise, see the LT1028 data sheet. ENABLE Pin The LT6230 includes an ENABLE pin that shuts down the amplifier to 10A maximum supply current. The ENABLE pin must be driven low to operate the amplifier with normal supply current. The ENABLE pin must be driven high to within 0.35V of V+ to shut down the supply current. This can be accomplished with simple gate logic; however care must be taken if the logic and the LT6230 operate from different supplies. If this is the case, then open-drain logic can be used with a pull-up resistor to ensure that the amplifier remains off. See the Typical Performance Characteristics. The output leakage current when disabled is very low; however, current can flow into the input protection diodes D1 and D2 if the output voltage exceeds the input voltage by a diode drop. 623012fc 18 LT6230/LT6230-10 LT6231/LT6232 Typical Applications Single Supply, Low Noise, Low Power, Bandpass Filter with Gain = 10 R1 732 Frequency Response Plot of Bandpass Filter C2 47pF f0 = V+ 23 1 = 1MHz 2RC C = C1C2, R = R1 = R2 VIN R2 732 ( 0.1F R3 10k - LT6230 + C3 0.1F R4 10k VOUT EN ) f0 = 732 MHz, MAXIMUM f0 = 1MHz R f-3dB = f0 2.5 AV = 20dB at f0 EN = 4VRMS INPUT REFERRED IS = 3.7mA FOR V+ = 5V GAIN (dB) C1 1000pF 3 623012 F03 -7 100k 1M FREQUENCY (Hz) 10M 623012 F04 Low Noise, Low Power, Single Supply, Instrumentation Amplifier with Gain = 100 R1 30.9 C2 2200pF R2 V+ 511 C8 68pF - U1 LT6230-10 + VIN1 C1 1F R15 88.7 EN R13 2k - R6 511 R3 30.9 R5 511 R4 V+ 511 U2 LT6230-10 + VIN2 C3 1F R16 88.7 R12 511 R14 2k - EN V+ R10 511 + C9 68pF U3 LT6230 VOUT EN C4 10F VOUT = 100 (VIN2 - VIN1) ( R10 ) (R15 ) GAIN = R2 + 1 R1 INPUT RESISTANCE = R5 = R6 f-3dB = 310Hz TO 11MHz EN = 20VRMS INPUT REFERRED IS = 10.5mA FOR VS = 5V, 0V R1 = R3 R2 = R4 R10 = R12 R15 = R16 623012 F05 623012fc 19 LT6230/LT6230-10 LT6231/LT6232 Package Description S6 Package 6-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1636) 0.62 MAX 2.90 BSC (NOTE 4) 0.95 REF 1.22 REF 3.85 MAX 2.62 REF 1.4 MIN 2.80 BSC 1.50 - 1.75 (NOTE 4) PIN ONE ID RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.30 - 0.45 6 PLCS (NOTE 3) 0.95 BSC 0.80 - 0.90 0.20 BSC 0.01 - 0.10 1.00 MAX DATUM `A' 0.30 - 0.50 REF 0.09 - 0.20 (NOTE 3) NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 1.90 BSC S6 TSOT-23 0302 REV B 623012fc 20 LT6230/LT6230-10 LT6231/LT6232 Package Description DD Package 8-Lead Plastic DFN (3mm x 3mm) (Reference LTC DWG # 05-08-1698 Rev C) 0.70 0.05 3.5 0.05 1.65 0.05 2.10 0.05 (2 SIDES) PACKAGE OUTLINE 0.25 0.05 0.50 BSC 2.38 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED PIN 1 TOP MARK (NOTE 6) 0.200 REF 3.00 0.10 (4 SIDES) R = 0.125 TYP 5 0.40 0.10 8 1.65 0.10 (2 SIDES) 0.75 0.05 4 0.25 0.05 1 (DD8) DFN 0509 REV C 0.50 BSC 2.38 0.10 0.00 - 0.05 BOTTOM VIEW--EXPOSED PAD NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1) 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON TOP AND BOTTOM OF PACKAGE 623012fc 21 LT6230/LT6230-10 LT6231/LT6232 Package Description S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .189 - .197 (4.801 - 5.004) NOTE 3 .045 .005 .050 BSC 7 8 .245 MIN .160 .005 5 6 .150 - .157 (3.810 - 3.988) NOTE 3 .228 - .244 (5.791 - 6.197) .030 .005 TYP 1 RECOMMENDED SOLDER PAD LAYOUT .010 - .020 x 45 (0.254 - 0.508) 3 2 4 .053 - .069 (1.346 - 1.752) .008 - .010 (0.203 - 0.254) .004 - .010 (0.101 - 0.254) 0- 8 TYP .016 - .050 (0.406 - 1.270) .050 (1.270) BSC .014 - .019 (0.355 - 0.483) TYP NOTE: 1. DIMENSIONS IN INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) SO8 0303 GN Package 16-Lead Plastic SSOP (Narrow .150 Inch) (Reference LTC DWG # 05-08-1641) .189 - .196* (4.801 - 4.978) .045 .005 16 15 14 13 12 11 10 9 .254 MIN .009 (0.229) REF .150 - .165 .229 - .244 (5.817 - 6.198) .0165 .0015 .150 - .157** (3.810 - 3.988) .0250 BSC RECOMMENDED SOLDER PAD LAYOUT 1 .015 .004 x 45 (0.38 0.10) .007 - .0098 (0.178 - 0.249) .0532 - .0688 (1.35 - 1.75) 2 3 4 5 6 7 8 .004 - .0098 (0.102 - 0.249) 0 - 8 TYP .016 - .050 (0.406 - 1.270) NOTE: 1. CONTROLLING DIMENSION: INCHES INCHES 2. DIMENSIONS ARE IN (MILLIMETERS) .008 - .012 (0.203 - 0.305) TYP .0250 (0.635) BSC GN16 (SSOP) 0204 3. DRAWING NOT TO SCALE *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 623012fc 22 LT6230/LT6230-10 LT6231/LT6232 Revision History (Revision history begins at Rev C) REV DATE DESCRIPTION PAGE NUMBER C 1/11 Updated ENABLE Pin section in Applications Information 18 623012fc Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 23 LT6230/LT6230-10 LT6231/LT6232 Typical Applications The LT6230 is applied as a transimpedance amplifier with an I-to-V conversion gain of 1.5k set by R1. The LT6230 is ideally suited to this application because of its low input offset voltage and current, and its low noise. This is because the 1.5k resistor has an inherent thermal noise of 5nV/Hz or 3.4pA/Hz at room temperature, while the LT6230 contributes only 1.1nV and 2.4pA /Hz. So, with respect to both voltage and current noises, the LT6230 is actually quieter than the gain resistor. The circuit uses an avalanche photodiode with the cathode biased to approximately 200V. When light is incident on the photodiode, it induces a current IPD which flows into the amplifier circuit. The amplifier output falls negative to maintain balance at its inputs. The transfer function is therefore VOUT = -IPD * 1.5k. C1 ensures stability and good settling characteristics. Output offset was measured at 280V, so low in part because R2 serves to cancel the DC effects of bias current. Output noise was measured at 1.1mVP-P on a 100MHz measurement bandwidth, with C2 shunting R2's thermal noise. As shown in the scope photo, the rise time is 17ns, indicating a signal bandwidth of 20MHz. Low Power Avalanche Photodiode Transimpedance Amplifier IS = 3.3mA 200V BIAS C1 4.7pF WWW.ADVANCEDPHOTONIX.COM 30mV/DIV ADVANCED PHOTONIX 012-70-62-541 R1 1.5k 5V - R2 1.5k Photodiode Amplifier Time Domain Response LT6230 + -5V 50ns/DIV ENABLE 623012 TA02b 623012 TA02a C2 0.1F OUTPUT OFFSET = 500V TYPICAL BANDWIDTH = 20MHz OUTPUT NOISE = 1.1mVP-P (100MHz MEASUREMENT BW) Related Parts PART NUMBER DESCRIPTION COMMENTS LT1028 Single, Ultralow Noise 50MHz Op Amp 0.85nV/Hz LT1677 Single, Low Noise Rail-to-Rail Amplifier 3V Operation, 2.5mA, 4.5nV/Hz, 60V Max VOS LT1806/LT1807 Single/Dual, Low Noise 325MHz Rail-to-Rail Amplifier 2.5V Operation, 550V Max VOS, 3.5nV/Hz LT6200/LT6201 Single/Dual, Low Noise 165MHz 0.95nVHz, Rail-to-Rail Input and Output LT6202/LT6203/LT6204 Single/Dual/Quad, Low Noise, Rail-to-Rail Amplifier 1.9nV/Hz, 3mA Max, 100MHz Gain Bandwidth 623012fc 24 Linear Technology Corporation LT 0111 REV C * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 2003