LT6230/LT6230-10/ LT6231/LT6232 215MHz, Rail-to-Rail Output, 1.1nV/Hz, 3.5mA Op Amp Family U DESCRIPTIO FEATURES Low Noise Voltage: 1.1nV/Hz Low Supply Current: 3.5mA/Amp Max Low Offset Voltage: 350V Max Gain Bandwidth Product: LT6230: 215MHz; AV 1 LT6230-10: 1450MHz; AV 10 Wide Supply Range: 3V to 12.6V Output Swings Rail-to-Rail Common Mode Rejection Ratio 115dB Typ Output Current: 30mA Operating Temperature Range - 40C to 85C LT6230 Shutdown to 10A Maximum LT6230/LT6230-10 in SOT-23 Package Dual LT6231 in 8-Pin SO and Tiny DFN Packages LT6232 in 16-Pin SSOP Package U APPLICATIO S Ultrasound Amplifiers Low Noise, Low Power Signal Processing Active Filters Driving A/D Converters Rail-to-Rail Buffer Amplifiers , LTC and LT are registered trademarks of Linear Technology Corporation. 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 gain bandwidth 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. 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 is available in the 6-lead SOT-23 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. U TYPICAL APPLICATIO Noise Voltage and Unbalanced Noise Current vs Frequency Low Noise Low Power Instrumentation Amplifier VS+ R4 499 + 6 R6 499 - VS+ R2 196 + R1 10 LT6202 VOUT - R3 196 - R5 499 VS- R7 499 + VS- 5 4 4 3 3 NOISE CURRENT 2 2 1 1/2 LT6231 IN- NOISE VOLTAGE (nV/Hz) 1/2 LT6231 6 VS = 2.5V TA = 25C VCM = 0V 5 AV = 40 BW = 5.1MHz VS = 1.5V to 5V IS = 10mA EN = 5.8VRMS INPUT REFERRED, MEASUREMENT BW = 8MHz 623012 TA01a 0 NOISE VOLTAGE 10 100 1k 10k FREQUENCY (Hz) 1 UNBALANCED NOISE CURRENT (pA/Hz) IN+ 0 100k 623012 TA01b sn623012 623012fas 1 LT6230/LT6230-10/ LT6231/LT6232 U W W W ABSOLUTE AXI U RATI GS (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 U W U PACKAGE/ORDER I FOR ATIO ORDER PART NUMBER - V 2 5 ENABLE +IN 3 4 -IN S6 PACKAGE 6-LEAD PLASTIC TSOT-23 TJMAX = 150C, JA = 250C/W S6 PART MARKING* LTAFJ LTAFK ORDER PART NUMBER TOP VIEW OUT A 1 -IN A 2 +IN A 3 V- 4 - + - + 8 V+ 7 OUT B 6 -IN B 5 +IN B S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 150C, JA = 200C/W LT6231CS8 LT6231IS8 OUT A 1 -IN A 2 +IN A 3 V- 4 6231 6231I - + 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 + 16 - + A -IN B 6 OUT B 7 NC 8 OUT D 15 -IN D 14 +IN D D 4 +IN B 5 S8 PART MARKING - + 8 - 6 V+ OUT 1 LT6230CS6 LT6230IS6 LT6230CS6-10 LT6230IS6-10 TOP VIEW + TOP VIEW ORDER PART NUMBER 13 V + -B + C- - LT6231CDD LT6231IDD DD PART MARKING* LAEU ORDER PART NUMBER LT6232CGN LT6232IGN 12 +IN C 11 -IN C 10 OUT C 9 GN PART MARKING NC GN PACKAGE 16-LEAD NARROW PLASTIC SSOP TJMAX = 150C, JA = 135C/W 6232 6232I *The temperature grade is identified by a label on the shipping container.Consult LTC Marketing for parts specified with wider operating temperature ranges. sn623012 623012fas 2 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 VOS Input Offset Voltage LT6230S6, LT6230S6-10 LT6231S8, LT6232GN LT6231DD MIN Input Offset Voltage Match (Channel-to-Channel) (Note 6) IB IOS 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 Bias Current 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 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 RL = 1k to VS/2 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 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 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 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 PSRR Minimum Supply Voltage (Note 7) 4 2.65 3 V V 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 30 25 45 40 3.15 0.2 mA mA 3.5 10 mA A sn623012 623012fas 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 IENABLE ENABLE Pin Current ENABLE = 0.3V VL ENABLE Pin Input Voltage LOW VH MIN TYP MAX UNITS -25 -75 A 0.3 V V+ - 0.35V ENABLE Pin Input Voltage HIGH = V+ - 0.35V, V O = 1.5V to 3.5V V 0.2 A Output Leakage Current ENABLE tON Turn-On Time ENABLE = 5V to 0V, RL = 1k, VS = 5V 300 ns tOFF Turn-Off Time ENABLE = 0V to 5V, RL = 1k, VS = 5V 41 s GBW Gain Bandwidth Product Frequency = 1MHz, VS = 5V LT6230-10 SR Slew Rate VS = 5V, AV = -1, RL = 1k, VO = 1.5V to 3.5V 200 1300 MHz MHz 60 V/s 250 V/s 6.3 MHz LT6230-10, HD2 = HD3 = 1% 11 MHz 0.1%, VS = 5V, VSTEP = 2V, AV = -1, RL = 1k 55 ns 42 LT6230-10, VS = 5V, AV = -10, RL = 1k, VO = 1.5V to 3.5V FPBW Full Power Bandwidth tS Settling Time (LT6230, LT6231, LT6232) 10 VS = 5V, VOUT = 3VP-P (Note 9) 4.8 The denotes the specifications which apply over 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 LT6230S6, LT6230S6-10 LT6231S8, LT6232GN LT6231DD Input Offset Voltage Match (Channel-to-Channel) (Note 6) VCM = Half Supply MAX UNITS MIN 600 450 550 V V V 800 V VOS TC Input Offset Voltage Drift (Note 10) IB Input Bias Current TYP 0.5 3 V/C 11 A IB Match (Channel-to-Channel) (Note 6) 1 A IOS Input Offset Current 0.7 A AVOL Large-Signal Gain VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS /2 RL = 1k to VS /2 RL = 100 to VS /2 VO = 1V to 4V, 78 17 4.1 V/mV V/mV V/mV VS = 3.3V, VO = 0.65V to 2.65V, RL = 10k to VS /2 RL = 1k to VS /2 66 13 V/mV V/mV VCM Input Voltage Range Guaranteed by CMRR, VS = 5V, 0V VS = 3.3V, 0V 1.5 1.15 CMRR Common Mode Rejection Ratio VS = 5V, VCM = 1.5V to 4V VS = 3.3V, VCM = 1.15V to 2.65V 90 85 dB dB 84 dB PSRR CMRR Match (Channel-to-Channel) (Note 6) VS = 5V, VCM = 1.5V to 4V Power Supply Rejection Ratio VS = 3V to 10V 85 dB PSRR Match (Channel-to-Channel) (Note 6) 79 dB 3 V VS = 3V to 10V Minimum Supply Voltage (Note 7) VOL Output Voltage Swing LOW (Note 8) No Load ISINK = 5mA VS = 5V, ISINK = 20mA VS = 3.3V, ISINK = 15mA 4 2.65 50 200 500 380 V V mV mV mV mV sn623012 623012fas 4 LT6230/LT6230-10/ LT6231/LT6232 ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over 0C < TA < 70C temperature range. VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply, ENABLE = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS VOH Output Voltage Swing HIGH (Note 8) No Load ISOURCE = 5mA VS = 5V, ISOURCE = 20mA VS = 3.3V, ISOURCE = 15mA ISC Short-Circuit Current VS = 5V VS = 3.3V IS Supply Current per Amplifier Disabled Supply Current per Amplifier ENABLE = V+ - 0.25V IENABLE ENABLE Pin Current ENABLE = 0.3V VL ENABLE Pin Input Voltage LOW VH ENABLE Pin Input Voltage HIGH Output Leakage Current MIN TYP MAX UNITS 60 215 650 430 mV mV mV mV 25 20 mA mA 4.2 mA A -85 A 0.3 V 1 V+ - 0.25V V ENABLE = V+ - 0.25V, VO = 1.5V to 3.5V 1 A tON Turn-On Time ENABLE = 5V to 0V, RL = 1k, VS = 5V 300 ns tOFF Turn-Off Time ENABLE = 0V to 5V, RL = 1k, VS = 5V 65 s SR Slew Rate VS = 5V, AV = -1, RL = 1k, VO = 1.5V to 3.5V LT6230-10, AV = -10, RL = 1k, VO = 1.5V to 3.5V 225 V/s VS = 5V, VOUT = 3VP-P LT6230, LT6231, LT6232 FPBW Full Power Bandwidth (Note 9) 35 V/s 3.7 MHz The denotes the specifications which apply over - 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 LT6230S6, LT6230S6-10 LT6231S8, LT6232GN LT6231DD Input Offset Voltage Match (Channel-to-Channel) (Note 6) MAX UNITS MIN TYP 700 550 650 V V V 1000 V VOS TC Input Offset Voltage Drift (Note 10) 3 V/C IB Input Bias Current 12 A VCM = Half Supply 0.5 IB Match (Channel-to-Channel) (Note 6) 1.1 A IOS Input Offset Current 0.8 A AVOL Large-Signal Gain VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS /2 RL = 1k to VS /2 RL = 100 to VS /2 VO = 1V to 4V, 72 16 3.6 V/mV V/mV V/mV VS = 3.3V, VO = 0.65V to 2.65V,RL = 10k to VS /2 RL = 1k to VS /2 60 12 V/mV V/mV VCM Input Voltage Range Guaranteed by CMRR, VS = 5V, 0V VS = 3.3V, 0V 1.5 1.15 CMRR Common Mode Rejection Ratio VS = 5V, VCM = 1.5V to 4V VS = 3.3V, VCM = 1.15V to 2.65V 90 85 dB dB CMRR Match (Channel-to-Channel) (Note 6) VS = 5V, VCM = 1.5V to 4V 84 dB Power Supply Rejection Ratio VS = 3V to 10V 85 dB PSRR 4 2.65 V V sn623012 623012fas 5 LT6230/LT6230-10/ LT6231/LT6232 ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over - 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 PSRR Match (Channel-to-Channel) (Note 6) VS = 3V to 10V Minimum Supply Voltage (Note 7) MIN TYP MAX UNITS 79 dB 3 V VOL Output Voltage Swing LOW (Note 8) No Load ISINK = 5mA VS = 5V, ISINK = 15mA VS = 3.3V, ISINK = 15mA 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 70 220 675 440 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+ - 0.2V IENABLE ENABLE Pin Current ENABLE = 0.3V VL ENABLE Pin Input Voltage LOW VH ENABLE Pin Input Voltage HIGH Output Leakage Current 15 15 mA mA 4.4 mA A -100 A 0.3 V 1 V+ - 0.2V V ENABLE = V+ - 0.2V, VO = 1.5V to 3.5V 1 A tON Turn-On Time ENABLE = 5V to 0V, RL = 1k, VS = 5V 300 ns tOFF Turn-Off Time ENABLE = 0V to 5V, RL = 1k, VS = 5V 72 s SR Slew Rate VS = 5V, AV = -1, RL = 1k, VO = 1.5V to 3.5V LT6230-10, AV = -10, RL = 1k, VO = 1.5V to 3.5V 185 V/s VS = 5V, VOUT = 3VP-P LT6230, LT6231, LT6232 FPBW Full Power Bandwidth (Note 9) 31 V/s 3.3 MHz 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 Input Offset Voltage Match (Channel-to-Channel) (Note 6) IB IOS MIN 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 Input Bias Current Input Noise Voltage 0.1Hz to 10Hz 180 en Input Noise Voltage Density f = 10kHz 1.1 in Input Noise Current Density, Balanced Source Unbalanced Source f = 10kHz, RS = 10k f = 10kHz, RS = 10k 1 2.4 nVP-P 1.7 nV/Hz pA/Hz pA/Hz sn623012 623012fas 6 LT6230/LT6230-10/ LT6231/LT6232 ELECTRICAL CHARACTERISTICS TA = 25C, VS = 5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX 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 RL = 1k VO = 2V, RL = 100 140 35 8.5 260 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 95 120 dB CMRR Match (Channel-to-Channel) (Note 6) VCM = -3V to 4V 89 125 dB 4 UNITS V 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 dB 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 3.3 0.2 3.9 ENABLE = 4.65V 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 PSRR 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 tOFF Turn-Off Time ENABLE = 0V to 5V, RL = 1k GBW Gain Bandwidth Product Frequency = 1MHz LT6230-10 SR Slew Rate AV = -1, RL = 1k, VO = -2V to 2V 62 150 1000 50 Full Power Bandwidth tS Settling Time (LT6230, LT6231, LT6232) s 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 LT6230-10, AV = -10, RL = 1k, VO = -2V to 2V FPBW 215 1450 ns VOUT = 3VP-P (Note 9) 5.3 sn623012 623012fas 7 LT6230/LT6230-10/ LT6231/LT6232 ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over 0C < TA < 70C temperature range. VS = 5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage LT6230S6, LT6230S6-10 LT6231S8, LT6232GN LT6231DD MAX UNITS MIN 600 450 550 V V V Input Offset Voltage Match (Channel-to-Channel) (Note 6) 800 V VOS TC Input Offset Voltage Drift (Note 10) IB Input Bias Current 11 A IB Match (Channel-to-Channel) (Note 6) 1 A 0.5 IOS Input Offset Current AVOL Large-Signal Gain VO = 4.5V, RL = 10k RL = 1k VO = 2V, RL = 100 100 27 6 VCM Input Voltage Range Guaranteed by CMRR -3 CMRR TYP 3 0.7 V/C A V/mV V/mV V/mV 4 V Common Mode Rejection Ratio VCM = -3V to 4V 95 dB CMRR Match (Channel-to-Channel) (Note 6) VCM = -3V to 4V 89 dB dB Power Supply Rejection Ratio VS = 1.5V to 5V 85 PSRR Match (Channel-to-Channel) (Note 6) VS = 1.5V to 5V 79 VOL Output Voltage Swing LOW (Note 8) No Load ISINK = 5mA ISINK = 20mA 50 200 500 mV mV mV VOH Output Voltage Swing HIGH (Note 8) No Load ISOURCE = 5mA ISOURCE = 20mA 60 215 650 mV mV mV ISC Short-Circuit Current IS Supply Current per Amplifier Disabled Supply Current per Amplifier ENABLE = 4.75V IENABLE ENABLE Pin Current ENABLE = 0.3V VL ENABLE Pin Input Voltage LOW VH ENABLE Pin Input Voltage HIGH PSRR tON dB 25 mA 4.6 mA A -95 A 0.3 V 1 4.75 V Output Leakage Current ENABLE = 4.75V, VO = 1V 1 A Turn-On Time ENABLE = 5V to 0V, RL = 1k 300 ns tOFF Turn-Off Time ENABLE = 0V to 5V, RL = 1k SR Slew Rate AV = -1, RL = 1k, VO = -2V to 2V LT6230-10, AV = -10, RL = 1k, VO = -2V to 2V FPBW Full Power Bandwidth VOUT = 3VP-P (Note 9) LT6230, LT6231, LT6232 85 44 315 4.66 s V/s V/s MHz sn623012 623012fas 8 LT6230/LT6230-10/ LT6231/LT6232 ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over -40C < TA < 85C temperature range. VS = 5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted. (Note 5) SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage LT6230, LT6230-10 LT6231S8, LT6232GN LT6231DD MAX UNITS MIN 700 550 650 V V V Input Offset Voltage Match (Channel-to-Channel) (Note 6) 1000 V VOS TC Input Offset Voltage Drift (Note 10) IB Input Bias Current 12 A IB Match (Channel-to-Channel) (Note 6) 1.1 A 0.5 IOS Input Offset Current AVOL Large-Signal Gain VO = 4.5V, RL = 10k RL = 1k VO = 1.5V, RL = 100 93 25 4.8 VCM Input Voltage Range Guaranteed by CMRR -3 CMRR TYP 3 0.8 V/C A V/mV V/mV V/mV 4 V Common Mode Rejection Ratio VCM = -3V to 4V 95 dB CMRR Match (Channel-to-Channel) (Note 6) VCM = -3V to 4V 89 dB dB Power Supply Rejection Ratio VS = 1.5V to 5V 85 PSRR Match (Channel-to-Channel) (Note 6) VS = 1.5V to 5V 79 VOL Output Voltage Swing LOW (Note 8) No Load ISINK = 5mA ISINK = 15mA 60 210 510 mV mV mV VOH Output Voltage Swing HIGH (Note 8) No Load ISOURCE = 5mA ISOURCE = 20mA 70 220 675 mV mV mV ISC Short-Circuit Current IS Supply Current per Amplifier Disabled Supply Current per Amplifier ENABLE = 4.8V IENABLE ENABLE Pin Current ENABLE = 0.3V VL ENABLE Pin Input Voltage LOW VH ENABLE Pin Input Voltage HIGH PSRR Output Leakage Current dB 15 mA 4.85 mA A -110 A 0.3 V 1 4.8 V ENABLE = 4.8V, VO = 1V 1 A ns tON Turn-On Time ENABLE = 5V to 0V, RL = 1k 300 tOFF Turn-Off Time ENABLE = 0V to 5V, RL = 1k 72 SR Slew Rate AV = -1, RL = 1k, VO = -2V to 2V LT6230-10, AV = -10, RL = 1k, VO = -2V to 2V FPBW Full Power Bandwidth (Note 9) VOUT = 3VP-P LT6230, LT6231, LT6232 37 260 3.9 s V/s V/s MHz sn623012 623012fas 9 LT6230/LT6230-10/ LT6231/LT6232 ELECTRICAL CHARACTERISTICS Note 1: Absolute maximum ratings are those values beyond which the life of the device may be impaired. 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. 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. 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. U W TYPICAL PERFOR A CE CHARACTERISTICS (LT6230/LT6231/LT6232) Supply Current vs Supply Voltage (Per Amplifier) VOS Distribution 6 100 VS = 5V, 0V + 90 VCM = V /2 S8 80 2.0 60 50 40 30 20 4 TA = 125C 3 TA = 25C 2 TA = -55C OFFSET VOLTAGE (mV) 70 1 0 0 2 10 12 4 8 6 TOTAL SUPPLY VOLTAGE (V) 623012 GO1 10 TA = -55C TA = 125C TA = 25C 2 -1 0 4 5 3 2 COMMON MODE VOLTAGE (V) 1 6 623012 GO4 TA = -55C -1.0 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) 623012 GO3 Output Saturation Voltage vs Load Current (Output Low) 10 VS = 5V, 0V 8 7 VCM = 4V 6 VCM = 1.5V 5 4 0 -2 14 9 INPUT BIAS CURRENT (A) INPUT BIAS CURRENT (A) 12 4 -0.5 -2.0 OUTPUT SATURATION VOLTAGE (V) 10 6 0 Input Bias Current vs Temperature VS = 5V, 0V 8 0.5 623012 GO2 Input Bias Current vs Common Mode Voltage 14 1.0 -1.5 10 0 50 100 150 200 -200 -150 -100 -50 0 INPUT OFFSET VOLTAGE (V) VS = 5V, 0V 1.5 5 SUPPLY CURRENT (mA) NUMBER OF UNITS Offset Voltage vs Input Common Mode Voltage 3 -50 -25 75 50 25 TEMPERATURE (C) 0 100 125 623012 GO5 VS = 5V, 0V 1 0.1 TA = 125C TA = -55C 0.01 TA = 25C 0.001 0.01 0.1 1 10 LOAD CURRENT (mA) 100 623012 GO6 sn623012 623012fas 10 LT6230/LT6230-10/ LT6231/LT6232 U W TYPICAL PERFOR A CE CHARACTERISTICS (LT6230/LT6231/LT6232) Output Saturation Voltage vs Load Current (Output High) 1.0 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 4 4.5 5 2 2.5 3.5 3 1.5 POWER SUPPLY VOLTAGE (V) 623012 G08 623012 GO9 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 1 1.5 2 OUTPUT VOLTAGE (V) 2.5 -2.5 3 623012 G10 30 TA = -55C 0.5 0 -0.5 TA = 25C TA = 125C -1.0 -1.5 CHANGE IN OFFSET VOLTAGE (V) 1.0 100 28 VS = 5V 24 VS = 2.5V 22 20 VS = 1.5V 18 5 Total Noise vs Total Source Resistance TA = 25C 26 4 623012 G12 Warm-Up Drift vs Time VS = 5V 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) 0.5 RL = 100 -1.0 -2.0 0 RL = 1k 0 -1.5 -2.5 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 0.1 0 20 40 60 80 100 120 140 160 TIME AFTER POWER-UP (s) 623012 G14 10 100 1k 10k SOURCE RESISTANCE () 100k 623012 G15 sn623012 623012fas 11 LT6230/LT6230-10/ LT6231/LT6232 U W TYPICAL PERFOR A CE CHARACTERISTICS (LT6230/LT6231/LT6232) 0.1Hz to 10Hz Output Voltage Noise Noise Voltage and Unbalanced Noise Current vs Frequency 3 3 NOISE CURRENT 2 2 1 1 10 100 100nV -100nV 0 100k 1k 10k FREQUENCY (Hz) GAIN (dB) 120 CL = 5pF RL = 1k 100 VCM = VS/2 80 VS = 5V 60 40 30 20 20 0 VS = 5V 10 -20 GAIN 0 -40 VS = 3V, 0V -10 -20 100k 1M 10M 100M FREQUENCY (Hz) 1G 40 240 220 200 GAIN BANDWIDTH 180 -60 160 -80 140 AV = 2 0.1 0.01 100k 1M 10M FREQUENCY (Hz) 70 60 100M 623012 G22 VS = 2.5V FALLING 50 VS = 2.5V RISING 40 30 0 2 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 Channel Separation vs Frequency -40 100 CHANNEL SEPARATION (dB) AV = 10 AV = 1 80 VS = 5V RISING 623012 G20 COMMON MODE REJECTION RATIO (dB) OUTPUT IMPEDANCE () 100 125 VS = 5V FALLING 90 Common Mode Rejection Ratio vs Frequency VS = 5V, 0V 95 AV = -1 110 RF = RG = 1k 120 1 65 35 5 TEMPERATURE (C) -25 100 50 PHASE MARGIN Output Impedance vs Frequency 10 GAIN BANDWIDTH 120 60 623012 G19 1k VS = 3V, 0V 180 Slew Rate vs Temperature 70 TA = 25C CL = 5pF RL = 1k PHASE (dB) VS = 3V, 0V 40 200 623012 G18 PHASE MARGIN (DEG) 50 40 VS = 5V 220 Gain Bandwidth and Phase Margin vs Supply Voltage GAIN BANDWIDTH (MHz) PHASE 60 VS = 3V, 0V 240 623012 G17 Open Loop Gain vs Frequency 70 60 VS = 5V 50 140 -55 5s/DIV 623012 G16 80 PHASE MARGIN 160 SLEW RATE (V/s) 0 NOISE VOLTAGE 70 CL = 5pF RL = 1k VCM = VS/2 GAIN BANDWIDTH (MHz) 4 100nV/DIV 4 VS = 2.5V 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 sn623012 623012fas 12 PHASE MARGIN (DEG) 5 6 VS = 2.5V TA = 25C VCM = 0V 5 UNBALANCED NOISE CURRENT (pA/Hz) NOISE VOLTAGE (nV/Hz) 6 Gain Bandwidth and Phase Margin vs Temperature LT6230/LT6230-10/ LT6231/LT6232 U W TYPICAL PERFOR A CE CHARACTERISTICS (LT6230/LT6231/LT6232) Power Supply Rejection Ratio vs Frequency VS = 5V, 0V TA = 25C VCM = VS/2 80 50 50 40 40 POSITIVE SUPPLY 60 NEGATIVE SUPPLY 40 VS = 5V, 0V 45 AV = 2 35 RS = 10 30 25 RS = 20 20 15 30 20 15 5 0 10k 1M 100k FREQUENCY (Hz) 10M 0 10 100M 100 CAPACITIVE LOAD (pF) Settling Time vs Output Step (Non-Inverting) 500 - VOUT + VIN 500 100 1mV 1mV 50 -4 -3 -2 2 1 0 OUTPUT STEP (V) -1 - VIN VOUT + 100 1mV 1mV 50 10mV 10mV 0 150 3 10mV 0 4 -4 -3 10mV -2 2 -1 1 0 OUTPUT STEP (V) 623012 G28 7 6 5 4 V = 5V 3 T S = 25C A HD2, HD3 < -40dBc 2 100k 1M 10k FREQUENCY (Hz) 10M Distortion vs Frequency -40 VS = 5V AV = 1 -50 VOUT = 2V(P-P) VS = 2.5V AV = 2 -50 VOUT = 2V(P-P) RL = 100, 3RD DISTORTION (dBc) RL = 100, 2ND -70 RL = 1k, 2ND -80 DISTORTION (dBc) RL = 100, 3RD RL = 100, 3RD -60 RL = 100, 2ND -70 RL = 1k, 2ND -80 -90 -90 -60 -70 10M 623012 G31 -100 10k RL = 100, 2ND -80 RL = 1k, 2ND -90 RL = 1k, 3RD RL = 1k, 3RD 100k 1M FREQUENCY (Hz) AV = 2 8 623012 G30 -40 VS = 2.5V AV = 1 -50 VOUT = 2V(P-P) DISTORTION (dBc) 4 AV = -1 9 Distortion vs Frequency Distortion vs Frequency -100 10k 3 10 623012 G29 -40 -60 Maximum Undistorted Output Signal vs Frequency VS = 5V TA = 25C AV = -1 500 SETTLING TIME (ns) SETTLING TIME (ns) 200 1000 623012 G27 Settling Time vs Output Step (Inverting) VS = 5V TA = 25C AV = 1 150 100 CAPACITIVE LOAD (pF) 623012 G26 623012 G25 200 10 1000 OUTPUT VOLTAGE SWING (VP-P) 1k RS = 50 RL = 50 10 5 0 RS = 20 25 RS = 50 RL = 50 10 20 RS = 10 35 OVERSHOOT (%) 100 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 100k 1M FREQUENCY (Hz) 10M 623012 G32 -100 10k RL = 1k, 3RD 100k 1M FREQUENCY (Hz) 10M 623012 G33 sn623012 623012fas 13 LT6230/LT6230-10/ LT6231/LT6232 U W TYPICAL PERFOR A CE CHARACTERISTICS (LT6230/LT6231/LT6232) Large Signal Response Distortion vs Frequency Small Signal Response -40 RL = 100, 3RD RL = 100, 2ND -60 RL = 1k, 3RD -70 50mV/DIV 2V 1V/DIV DISTORTION (dBc) VS = 5V AV = 2 -50 VOUT = 2V(P-P) 0V 0V -2V -80 -90 -100 10k VS = 2.5V AV = -1 RL = 1k RL = 1k, 2ND 100k 1M FREQUENCY (Hz) VS = 2.5V AV = 1 RL = 1k 200ns/DIV 623345 G35 200ns/DIV 623345 G36 10M 623012 G34 Output Overdrive Recovery VIN (1V/DIV) Large Signal Response 0V 0V VOUT (2V/DIV) 2V/DIV 5V -5V VS = 5V AV = 1 RL = 1k 0V VS = 2.5V AV = 3 200ns/DIV 200ns/DIV 623345 G37 623345 G38 (LT6230) ENABLE Characteristics Supply Current vs ENABLE Pin Voltage ENABLE Pin Current vs ENABLE Pin Voltage 30 TA = -55C TA = 125C 25 TA = 25C 3.0 2.5 VS = 2.5V AV = 1 TA = -55C 2.0 1.5 1.0 20 TA = 25C 0 VS = 2.5V -2.0 1.0 0 -1.0 PIN VOLTAGE (V) 2.0 623012 G39 0V 15 T = 125C A 0.5V 10 5 0.5 5V VOUT 3.5 ENABLE PIN CURRENT (A) SUPPLY CURRENT (mA) 4.0 ENABLE Pin Response Time ENABLE PIN 4.5 0 -2.0 0 1.0 -1.0 PIN VOLTAGE (V) 2.0 0V VS = 2.5V VIN = 0.5V AV = 1 RL = 1k 100s/DIV 623345 G41 623012 G40 sn623012 623012fas 14 LT6230/LT6230-10/ LT6231/LT6232 U W TYPICAL PERFOR A CE CHARACTERISTICS (LT6230-10) Gain Bandwidth and Phase Margin vs Temperature 600 1100 VS = 3V, 0V 900 80 70 VS = 5V PHASE MARGIN VS = 3V, 0V 75 50 25 TEMPERATURE (C) -50 -25 100 0 125 450 VS = 5V RISING 400 350 300 250 200 50 150 40 100 -55 -35 -15 PHASE 10 VS = 2.5V FALLING 0 20 VS = 3V, 0V 0 20 -20 0 -10 100k 1M VS = 5V -40 TA = 25C AV = 10 1450 CL = 5pF RL = 1k GAIN BANDWIDTH 950 100 PHASE MARGIN 50 -80 1G 0 2 10 8 6 TOTAL SUPPLY VOLTAGE (V) 4 623012 G45 60 40 20 1M 10M FREQUENCY (Hz) 100M 800 600 400 200 0 0 0 1G 623012 G48 1000 400 800 600 TOTAL RESISTOR LOAD () (INCLUDES FEEDBACK R) 623012 G47 200 2nd and 3rd Harmonic Distortion vs Frequency -40 VS = 2.5V AV = 10 -50 VOUT = 2V(P-P) 10 9 OUTPUT VOLTAGE SWING (VP-P) COMMON MODE REJECTION RATIO (dB) 80 100k 1000 Maximum Undistorted Output Signal vs Frequency VS = 5V, 0V VCM = VS/2 100 0 10k 12 1200 623012 G46 Common Mode Rejection Ratio vs Frequency 120 ASV = 10 V 5V TA = 25C RF = 1k RG = 100 1400 -60 10M 100M FREQUENCY (Hz) Gain Bandwidth vs Resistor Load 1600 1200 10000 623012 G44 8 DISTORTION (dBc) AV = 10 CL = 5pF RL = 1k VCM = VS/2 10 GAIN BANDWIDTH (MHz) 40 100 1000 CAPACITIVE LOAD (pF) 10 5 25 45 65 85 105 125 TEMPERATURE (C) PHASE MARGIN (DEG) 60 PHASE (DEG) GAIN (dB) 80 VS = 3V, 0V 40 30 RS = 50 20 1700 100 GAIN 50 30 623012 G43 120 VS = 5V RS = 20 Gain Bandwidth and Phase Margin vs Supply Voltage 90 60 RS = 10 40 VS = 2.5V RISING 60 Open Loop Gain and Phase vs Frequency 70 VS = 5V, 0V AV = 10 50 623012 G42 80 60 VS = 5V FALLING OVERSHOOT (%) GAIN BANDWIDTH 1300 PHASE MARGIN (DEG) GAIN BANDWIDTH (MHz) 1500 70 AV = -10 550 RF = 1k RG = 100 500 VS = 5V GAIN BANDWIDTH (MHz) AV = 10 SLEW RATE (V/s) 1700 Series Output Resistor and Overshoot vs Capacitive Load Slew Rate vs Temperature 7 6 5 4 -60 RL = 100, 2ND RL = 100, 3RD RL = 1k, 3RD -70 RL = 1k, 2ND -80 3 2 VS = 5V TA = 25C 1 AV = 10 HD2 = HD3 40dBc 0 100k 1M 10M 10k FREQUENCY (Hz) -90 100M -100 10k 100k 1M FREQUENCY (Hz) 10M 623012 G50 623012 G49 sn623012 623012fas 15 LT6230/LT6230-10/ LT6231/LT6232 U W TYPICAL PERFOR A CE CHARACTERISTICS (LT6230-10) 2nd and 3rd Harmonic Distortion vs Frequency Large Signal Response Output-Overload Recovery -40 VS = 5V AV = 10 -50 VOUT = 2V(P-P) RL = 100, 3RD -70 -100 10k 0V RL = 1k, 3RD -80 -90 VOUT VIN (0.5V/DIV) (2V/DIV) VOUT (2V/DIV) DISTORTION (dBc) RL = 100, 2ND -60 0V 0V RL = 1k, 2ND VS = 5V 100ns/DIV AV = 10 RF = 900, RG = 100 100k 1M FREQUENCY (Hz) VS = 5V, 0V 100ns/DIV AV = 10 RF = 900, RG = 100 623345 G52 623345 G53 10M 623012 G51 Input Referred High Frequency Noise Spectrum Small Signal Response 1nV/Hz/DIV VOUT (100mV/DIV) 10 2.5V 0 VS = 5V, 0V 100ns/DIV AV = 10 RF = 900, RG = 100 100kHz 50MHz 5MHz/DIV 623345 G54 623345 G55 sn623012 623012fas 16 LT6230/LT6230-10/ LT6231/LT6232 U U W U APPLICATIO S I FOR ATIO Amplifier Characteristics 2.5V 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. +V Q5 CM Q3 -V +V DESD1 +V Q4 DESD5 VOUT C1 DESD2 -V Q1 -VIN D1 DESD6 DIFFERENTIAL DRIVE GENERATOR -V Q2 Q6 D2 +V +VIN DESD3 I1 DESD4 -V BIAS ENABLE +V -V 623012 F01 Figure 1. Simplified Schematic 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 over voltage 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 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 1V/DIV 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. 0V -2.5V 500s/DIV 623012 F02 Figure 2. VS = 2.5V, AV = 1 with Large Overdrive handle transient currents due to amplifier slew rate overdrive and clipping without protection resistors. 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. 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. sn623012 623012fas 17 LT6230/LT6230-10/ LT6231/LT6232 U W U U APPLICATIO S I FOR ATIO 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 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 Typical Characteristic Curves. 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. sn623012 623012fas 18 LT6230/LT6230-10/ LT6231/LT6232 U U W U APPLICATIO S I FOR ATIO Single Supply, Low Noise, Low Power, Bandpass Filter with Gain = 10 Frequency Response Plot of Bandpass Filter 23 R1 732 C2 47pF f0 = V+ 1 = 1MHz 2RC R2 732 ( 0.1F R3 10k - VIN LT6230 + C3 0.1F VOUT EN R4 10k GAIN (dB) C = C1C2, R = R1 = R2 C1 1000pF ) 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 3 -7 100k 623012 F03 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 R15 88.7 EN C1 1F V+ R10 511 R13 2k - R6 511 U3 LT6230 + R3 30.9 R5 511 R4 V+ 511 C3 1F R12 511 R14 2k - U2 LT6230-10 + VIN2 R16 88.7 EN C9 68pF VOUT EN C4 10F VOUT = 100 (VIN2 - VIN1) ( GAIN = R2 + 1 R1 R10 ) (R15 ) 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 sn623012 623012fas 19 LT6230/LT6230-10/ LT6231/LT6232 U PACKAGE DESCRIPTIO 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) 1.90 BSC S6 TSOT-23 0302 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 sn623012 623012fas 20 LT6230/LT6230-10/ LT6231/LT6232 U PACKAGE DESCRIPTIO DD Package 8-Lead Plastic DFN (3mm x 3mm) (Reference LTC DWG # 05-08-1698) 0.675 0.05 3.5 0.05 1.65 0.05 2.15 0.05 (2 SIDES) PACKAGE OUTLINE 0.25 0.05 0.50 BSC 2.38 0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS R = 0.115 TYP 5 3.00 0.10 (4 SIDES) 0.38 0.10 8 1.65 0.10 (2 SIDES) PIN 1 TOP MARK (NOTE 6) (DD8) DFN 1203 0.200 REF 0.75 0.05 0.00 - 0.05 4 0.25 0.05 1 0.50 BSC 2.38 0.10 (2 SIDES) 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 sn623012 623012fas 21 LT6230/LT6230-10/ LT6231/LT6232 U PACKAGE DESCRIPTIO 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 8 .245 MIN 7 6 5 .160 .005 .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) .008 - .010 (0.203 - 0.254) 0- 8 TYP .016 - .050 (0.406 - 1.270) NOTE: 1. DIMENSIONS IN .053 - .069 (1.346 - 1.752) .014 - .019 (0.355 - 0.483) TYP 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) 2 3 4 .004 - .010 (0.101 - 0.254) .050 (1.270) BSC SO8 0303 sn623012 623012fas 22 LT6230/LT6230-10/ LT6231/LT6232 U PACKAGE DESCRIPTIO 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) 2 3 4 5 6 7 .0532 - .0688 (1.35 - 1.75) 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 sn623012 623012fas 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 U TYPICAL APPLICATIO S 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 Photodiode Amplifier Time Domain Response C1 4.7pF WWW.ADVANCEDPHOTONIX.COM 30mV/DIV ADVANCED PHOTONIX 012-70-62-541 R1 1.5k 5V - R2 1.5k LT6230 + 50ns/DIV -5V 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, Ultra Low 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 sn623012 623012fas 24 Linear Technology Corporation LT/TP 0304 1K REV A * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 2003