LMH6654,LMH6655 LMH6654/LMH6655 Single/Dual Low Power, 250 MHz, Low Noise Amplifiers Literature Number: SNOS956C LMH6654/LMH6655 Single/Dual Low Power, 250 MHz, Low Noise Amplifiers General Description Features The LMH6654/LMH6655 single and dual high speed, voltage feedback amplifiers are designed to have unity-gain stable operation with a bandwidth of 250 MHz. They operate from 2.5V to 6V and each channel consumes only 4.5 mA. The amplifiers feature very low voltage noise and wide output swing to maximize signal-to-noise ratio. The LMH6654/LMH6655 have a true single supply capability with input common mode voltage range extending 150 mV below negative rail and within 1.3V of the positive rail. LMH6654/LMH6655 high speed and low power combination make these products an ideal choice for many portable, high speed application where power is at a premium. The LMH6654 is packaged in 5-Pin SOT-23 and 8-Pin SOIC. The LMH6655 is packaged in 8-Pin MSOP and 8-Pin SOIC. The LMH6654/LMH6655 are built on National's Advance VIP10TM (Vertically Integrated PNP) complementary bipolar process. (VS = 5V, TJ = 25C, Typical values unless specified). Voltage feedback architecture 250 MHz Unity gain bandwidth 2.5V to 6V Supply voltage range 200 V/sec Slew rate 4.5 mA/channel Supply current -5.15V to +3.7V Input common mode voltage -3.6V to 3.4V Output voltage swing (RL = 100) 4.5 nV/Hz Input voltage noise 1.7 pA/Hz Input current noise 25 ns Settling Time to 0.01% Applications ADC drivers Consumer video Active filters Pulse delay circuits xDSL receiver Pre-amps Typical Performance Characteristics Input Voltage Noise vs. Frequency 20016560 Closed Loop Gain vs. Frequency 20016558 VIP10TM is a trademark of National Semiconductor Corporation. (c) 2009 National Semiconductor Corporation 200165 www.national.com LMH6654/LMH6655 Single/Dual Low Power, 250 MHz, Low Noise Amplifiers June 24, 2009 LMH6654/LMH6655 Junction Temperature (Note 4) Soldering Information Infrared or Convection (20 sec.) Wave Soldering (10 sec.) Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. ESD Tolerance (Note 2) Human Body Model Machine Model VIN Differential Output Short Circuit Duration Supply Voltage (V+ - V-) Voltage at Input pins Storage Temperature Range Operating Ratings 2 kV 200V 1.2V (Note 3) 13.2V V+ +0.5V, V- -0.5V -65C to +150C +150C 235C 260C (Note 1) Supply Voltage (V+ - V-) Junction Temperature Range 2.5V to 6.0V -40C to +85C Thermal Resistance (JA) 8-Pin SOIC 8-Pin MSOP 5-Pin SOT-23 172C/W 235C/W 265C/W 5V Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25C, V+ = +5V, V- = -5V, VCM = 0V, AV = +1, RF = 25 for gain = +1, RF = 402 for gain = +2, and RL = 100. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Min (Note 6) Typ (Note 5) Max (Note 6) Units Dynamic Performance fCL GBWP Close Loop Bandwidth AV = +1 250 AV = +2 130 AV = +5 52 MHz AV = +10 26 Gain Bandwidth Product AV +5 260 MHz Bandwidth for 0.1 dB Flatness AV +1 18 MHz 50 deg 200 V/s 25 ns m Phase Margin SR Slew Rate (Note 8) AV = +1, VIN = 2 VPP tS Settling Time 0.01% AV = +1, 2V Step 15 ns tr Rise Time AV = +1, 0.2V Step 1.4 ns tf Fall Time AV = +1, 0.2V Step 1.2 ns 4.5 nV/ pA/ 0.1% Distortion and Noise Response en Input Referred Voltage Noise f 0.1 MHz in Input-Referred Current Noise f 0.1 MHz 1.7 Second Harmonic Distortion AV = +1, f = 5 MHz -80 Third Harmonic Distortion VO = 2 VPP, RL = 100 -85 Xt Crosstalk (for LMH6655 only) Input Referred, 5 MHz, Channel-to-Channel -80 DG Differential Gain AV = +2, NTSC, RL = 150 0.01 % Differential Phase AV = +2, NTSC, RL = 150 0.025 deg DP dBc dB Input Characteristics -3 -4 VOS Input Offset Voltage VCM = 0V TC VOS Input Offset Average Drift VCM = 0V (Note 7) IB Input Bias Current VCM = 0V IOS Input Offset Current VCM = 0V RIN Input Resistance www.national.com 1 3 4 6 -1 -2 mV V/C 5 12 18 A 0.3 1 2 A Common Mode 4 M Differential Mode 20 k 2 Parameter Conditions Min (Note 6) Common Mode CIN Input Capacitance CMRR Common Mode Rejection Ration Input Referred, VCM = 0V to -5V CMVR Input Common- Mode Voltage Range CMRR 50 dB Typ (Note 5) Max (Note 6) 1.8 Differential Mode pF 1 70 68 90 -5.15 3.5 3.7 60 58 67 3.4 3.2 3.6 Units dB -5.0 V Transfer Characteristics AVOL Large Signal Voltage Gain VO = 4 VPP, RL = 100 dB Output Characteristics VO Output Swing High No Load Output Swing Low No Load Output Swing High RL = 100 Output Swing Low RL = 100 -3.9 3.2 3.0 Sourcing, VO = 0V ISC Short Circuit Current (Note 3) Sinking, VO = 0V VIN = 200 mV IOUT Output Current RO Output Resistance V 3.4 -3.6 VIN = 200 mV -3.7 -3.5 145 130 280 100 80 185 -3.4 -3.2 mA Sourcing, VO = +3V 80 Sinking, VO = -3V 120 AV = +1, f <100 kHz 0.08 76 dB mA Power Supply PSRR Power Supply Rejection Ratio IS Supply Current (per channel) Input Referred, VS = 5V to 6V 60 4.5 6 7 mA 5V Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25C, V+ = +5V, V- = -0V, VCM = 2.5V, AV = +1, RF = 25 for gain = +1, RF = 402 for gain = +2, and RL = 100 to V+/2. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Min (Note 6) Typ (Note 5) Max (Note 6) Units Dynamic Performance fCL GBWP m AV = +1 230 AV = +2 120 AV = +5 50 AV = +10 25 Gain Bandwidth Product AV +5 250 MHz Bandwidth for 0.1 dB Flatness AV = +1 17 MHz 48 deg 190 V/s 30 ns Close Loop Bandwidth Phase Margin SR Slew Rate (Note 8) AV = +1, VIN = 2 VPP tS Settling Time 0.01% AV = +1, 2V Step 0.1% tr tf MHz 20 ns Rise Time AV = +1, 0.2V Step 1.5 ns Fall Time AV = +1, 0.2V Step 1.35 ns 3 www.national.com LMH6654/LMH6655 Symbol LMH6654/LMH6655 Symbol Parameter Conditions Min (Note 6) Typ (Note 5) Max (Note 6) Units Distortion and Noise Response en Input Referred Voltage Noise f 0.1 MHz 4.5 nV/ in Input Referred Current Noise f 0.1 MHz 1.7 pA/ Second Harmonic Distortion AV = +1, f = 5 MHz -65 Third Harmonic Distortion VO = 2 VPP, RL = 100 -70 Crosstalk (for LMH6655 only) Input Referred, 5 MHz -78 Xt dBc dB Input Characteristics -5 -6.5 VOS Input Offset Voltage VCM = 2.5V TC VOS Input Offset Average Drift VCM = 2.5V (Note 7) IB Input Bias Current VCM = 2.5V IOS Input Offset Current VCM = 2.5V RIN Input Resistance CIN Input Capacitance CMRR Common Mode Rejection Ration CMVR Input Common Mode Voltage Range 2 5 6.5 V/C 6 -2 -3 mV 6 12 18 A 0.5 2 3 A Common Mode 4 M Differential Mode 20 k Common Mode 1.8 Differential Mode Input Referred, VCM = 0V to -2.5V pF 1 70 68 CMRR 50 dB 90 -0.15 3.5 3.7 58 55 64 3.6 3.4 3.75 dB 0 V Transfer Characteristics AVOL Large Signal Voltage Gain VO = 1.6 VPP, RL = 100 dB Output Characteristics VO Output Swing High No Load Output Swing Low No Load Output Swing High RL = 100 Output Swing Low RL = 100 0.9 3.5 3.35 ISC Short Circuit Current (Note 3) VIN = 200 mV Sinking, VO = 2.5V VIN = 200 mV IOUT Output Current RO Output Resistance V 3.70 1 Sourcing , VO = 2.5V 1.1 1.3 90 80 170 70 60 140 1.3 1.45 mA Sourcing, VO = +3.5V 30 Sinking, VO = 1.5V 60 AV = +1, f <100 kHz .08 75 dB mA Power Supply PSRR Power Supply Rejection Ratio IS Supply Current (per channel) www.national.com Input Referred , VS = 2.5V to 3V 60 4.5 4 6 7 mA Note 2: Human body model, 1.5 k in series with 100 pF. Machine model: 0 in series with 100 pF. Note 3: Continuous short circuit operation at elevated ambient temperature can result in exceeding the maximum allowed junction temperature at 150C. Note 4: The maximum power dissipation is a function of TJ(MAX), JA and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ (MAX) - TA)/JA. All numbers apply for packages soldered directly onto a PC board. Note 5: Typical Values represent the most likely parametric norm. Note 6: All limits are guaranteed by testing or statistical analysis. Note 7: Offset voltage average drift is determined by dividing the change in VOS at temperature extremes into the total temperature change. Note 8: Slew rate is the slower of the rising and falling slew rates. Slew rate is rate of change from 10% to 90% of output voltage step. Connection Diagrams 8-Pin SOIC (LMH6654) 20016521 Top View 5-Pin SOT-23 (LMH6654) 8-Pin SOIC and MSOP (LMH6655) 20016520 Top View 20016519 Top View Ordering Information Package Part Number LMH6654MA 8-Pin SOIC LMH6654MAX LMH6655MA LMH6655MAX 5-Pin SOT-23 8-Pin MSOP LMH6654MF LMH6654MFX LMH6655MM LMH6655MMX Package Marking LMH6654MA LMH6655MA Transport Media 95 Units Rails 2.5k Units Tape and Reel 95 Units Rails 3K Units Tape and Reel 1k Units Tape and Reel A67A 3.5k Units Tape and Reel 5 M08A 2.5k Units Tape and Reel 1k Units Tape and Reel A66A NSC Drawing MF05A MUA08A www.national.com LMH6654/LMH6655 Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics Table. LMH6654/LMH6655 Typical Performance Characteristics TJ = 25C, V+ = 5V, V- = -5, RF = 25 for gain = +1, RF = 402 and for gain +2, and RL = 100, unless otherwise specified. Closed Loop Bandwidth (G = +1) Closed Loop Bandwidth (G = +2) 20016509 20016510 Closed Loop Bandwidth (G = +5) Closed Loop Bandwidth (G = +10) 20016511 20016512 Supply Current per Channel vs. Supply Voltage Supply Current per Channel vs. Temperature 20016535 www.national.com 20016548 6 LMH6654/LMH6655 Offset Voltage vs. Supply Voltage (VCM = 0V) Offset Voltage vs. Common Mode 20016532 20016549 Offset Voltage vs. Common Mode Bias Current and Offset Voltage vs. Temperature 20016551 20016539 Bias Current vs. Common Mode Voltage Bias Current vs. Common Mode Voltage 20016565 20016537 7 www.national.com LMH6654/LMH6655 AOL, PSRR and CMRR vs. Temperature Inverting Large Signal Pulse Response (VS = 5V) 20016502 20016550 Inverting Large Signal Pulse Response (VS = 5V) Non-Inverting Large Signal Pulse Response (VS = 5V) 20016504 20016506 Non-Inverting Large Signal Pulse Response (VS = 5V) Non-Inverting Small Signal Pulse Response (VS = 5V) 20016508 www.national.com 20016505 8 Inverting Small Signal Pulse Response (VS = 5V) 20016507 20016501 Inverting Small Signal Pulse Response (VS = 5V) Input Voltage and Current Noise vs. Frequency (VS = 5V) 20016503 20016513 Input Voltage and Current Noise vs. Frequency (VS = 5V) Harmonic Distortion vs. Frequency G = +1, VO = 2 VPP, VS = 5V 20016514 20016517 9 www.national.com LMH6654/LMH6655 Non-Inverting Small Signal Pulse Response (VS = 5V) LMH6654/LMH6655 Harmonic Distortion vs. Frequency G = +1, VO = 2 VPP, VS = 5V Harmonic Distortion vs. Temperature VS = 5V, f = 5 MHz, VO = 2 VPP 20016529 20016518 Harmonic Distortion vs. Temperature VS = 5V, f = 5 MHz, VO = 2 VPP Harmonic Distortion vs. Gain VS = 5V, f = 5 MHz, VO = 2 VPP 20016528 20016531 Harmonic Distortion vs. Gain VS = 5V, f = 5 MHz, VO = 2 VPP Harmonic Distortion vs. Output Swing (G = +2, VS = 5V, f = 5 MHz) 20016559 20016530 www.national.com 10 LMH6654/LMH6655 Harmonic Distortion vs. Output Swing (G = +2, VS = 5V, f = 5 MHz) PSRR vs. Frequency 20016516 20016522 CMRR vs. Frequency Output Sinking Current 20016564 20016546 Output Sourcing Current CrossTalk vs. Frequency (LMH6655 only) 20016547 20016561 11 www.national.com LMH6654/LMH6655 CrossTalk vs. Frequency (LMH6655 only) Isolation Resistance vs. Capacitive Load 20016562 20016563 Open Loop Gain and Phase vs. Frequency 20016527 The PCB should have a ground plane covering all unused portion of the component side of the board to provide a low impedance path. All trace lengths should be minimized to reduce series inductance. Supply bypassing is required for the amplifiers performance. The bypass capacitors provide a low impedance return current path at the supply pins. They also provide high frequency filtering on the power supply traces. It is recommended that a ceramic decoupling capacitor 0.1 F chip should be placed with one end connected to the ground plane and the other side as close as possible to the power pins. An additional 10 F tantalum electrolytic capacitor should be connected in parallel, to supply current for fast large signal changes at the output. Application Information GENERAL INFORMATION The LMH6654 single and LMH6655 dual high speed, voltage feedback amplifiers are manufactured on National Semiconductor's new VIP10 (Vertically Integrated PNP) complementary bipolar process. These amplifiers can operate from 2.5V to 6V power supply. They offer low supply current, wide bandwidth, very low voltage noise and large output swing. Many of the typical performance plots found in the datasheet can be reproduced if 50 coax and 50 RIN/ROUT resistors are used. CIRCUIT LAYOUT CONSIDERATION With all high frequency devices, board layouts with stray capacitance have a strong influence on the AC performance. The LMH6654/LMH6655 are not exception and the inverting input and output pins are particularly sensitive to the coupling of parasitic capacitance to AC ground. Parasitic capacitances on the inverting input and output nodes to ground could cause frequency response peaking and possible circuit oscillation. Therefore, the power supply, ground traces and ground plan should be placed away from the inverting input and output pins. Also, it is very important to keep the parasitic capacitance across the feedback to an absolute minimum. www.national.com 12 DRIVING CAPACITIVE LOADS Capacitive loads decrease the phase margin of all op amps. The output impedance of a feedback amplifier becomes inductive at high frequencies, creating a resonant circuit when the load is capacitive. This can lead to overshoot, ringing and oscillation. To eliminate oscillation or reduce ringing, an isolation resistor can be placed as shown in Figure 2 below. At frequencies above the load impedance of the Amplifier approaches RISO. The desired performance depends on the value of the isolation resistor. The isolation resistance vs. capacitance load graph in the typical performance characteristics provides the means for selection of the value of RS that provides 3 dB peaking in closed loop AV = 1 response. In general, the bigger the isolation resistor, the more damped the pulse response becomes. For initial evaluation, a 50 isolation resistor is recommended. 20016541 FIGURE 1. EVALUATION BOARDS National provides the following evaluation boards as a guide for high frequency layout and as an aid in device testing and characterization. Device Package LMH6654MF LMH6654MA LMH6655MA LMH6655MM 5-Pin SOT-23 8-Pin SOIC 8-Pin SOIC 8-Pin MSOP Evalulation Board PN CLC730068 CLC730027 CLC730036 CLC730123 The free evaluation board are shipped automatically when a device sample request is placed with National Semiconductor. The CLC730027 datasheet also contains tables of recommended components to evaluate several of National's high speed amplifiers. This table for the LMH6654 is illustrated below. Refer to the evaluation board datasheet for schematics and further information. Components Needed to Evaluate the LMH6654 on the Evaluation Board: * RfRg use the datasheet to select values. * RIN, ROUT typically 50 (Refer to the Basic Operation section of the evaluation board datasheet for details) * Rf is an optional resistor for inverting again configurations (select Rf to yield desired input impedance = Rg||Rf) * C1, C2 use 0.1 F ceramic capacitors * C3, C4 use 10 F tantalum capacitors Components not used: 1. C5, C6, C7, C8 2. R1 thru R8 The evaluation boards are designed to accommodate dual supplies. The board can be modified to provide single operation. For best performance; 1) do not connect the unused supply. 2) ground the unused supply pin. 20016540 FIGURE 2. POWER DISSIPATION The package power dissipation should be taken into account when operating at high ambient temperature and/or high power dissipative conditions. In determining maximum operable 13 www.national.com LMH6654/LMH6655 temperature of the device, make sure the total power dissipation of the device is considered; this power dissipated in the device with a load connected to the output as well as the nominal dissipation of the op amp. LMH6654/LMH6655 would otherwise be a parasitic inductance (the feedback wire) into the parasitic capacitance at the inverting input. COMPONENTS SELECTION AND FEEDBACK RESISTOR It is important in high-speed applications to keep all component leads short since wires are inductive at high frequency. For discrete components, choose carbon composition axially leaded resistors and micro type capacitors. Surface mount components are preferred over discrete components for minimum inductive effect. Never use wire wound type resistors in high frequency applications. Large values of feedback resistors can couple with parasitic capacitance and cause undesired effects such as ringing or oscillation in high-speed amplifiers. Keep resistors as low as possible consistent with output loading consideration. For a gain of 2 and higher, 402 feedback resistor used for the typical performance plots gives optimal performance. For unity gain follower, a 25 feedback resistor is recommended rather than a direct short. This effectively reduces the Q of what BIAS CURRENT CANCELLATION In order to cancel the bias current errors of the non-inverting configuration, the parallel combination of the gain setting Rg and feedback Rf resistors should equal the equivalent source resistance Rseq as defined in Figure 3. Combining this constraint with the non-inverting gain equation, allows both Rf and Rg to be determined explicitly from the following equations: Rf = AVRseq and Rg = Rf/(AV-1) For inverting configuration, bias current cancellation is accomplished by placing a resistor Rb on the non-inverting input equal in value to the resistance seen by the inverting input (Rf//(Rg+Rs). The additional noise contribution of Rb can be minimized through the use of a shunt capacitor. 20016542 FIGURE 3. Non-Inverting Amplifier Configuration www.national.com 14 LMH6654/LMH6655 20016543 FIGURE 4. Inverting Amplifier Configuration Rf||Rg=Rseq for bias current cancellation. Figure 6 illustrates the equivalent noise model using this assumption. The total equivalent output voltage noise (eno) is eni * AV. TOTAL INPUT NOISE VS. SOURCE RESISTANCE The noise model for the non-inverting amplifier configuration showing all noise sources is described in Figure 5. In addition to the intrinsic input voltage noise (en) and current noise (in = in+ = in-) sources, there also exits thermal associated with each of the external voltage noise resistors. Equation 1 provides the general form for total equivalent input voltage noise density (eni). Equation 2 is a simplification of Equation 1 that assumes 20016545 FIGURE 6. Noise Model with Rf||Rg = Rseq (2) If bias current cancellation is not a requirement, then Rf||Rg does not need to equal Rseq. In this case, according to Equation 1, RfRg should be as low as possible in order to minimize noise. Results similar to Equation 1 are obtained for the inverting configuration on Figure 2 if Rseq is replaced by Rb and Rg is replaced by Rg + Rs. With these substitutions, Equation 1 will yield an eni referred to the non-inverting input. Referring to eni to the inverting input is easily accomplished by multiplying eni by the ration of non-inverting to inverting gains. 20016544 FIGURE 5. Non-Inverting Amplifier Noise Model (1) Noise Figure Noise Figure (NF) is a measure of the noise degradation caused by an amplifier. The noise figure formula is shown is Equation 3. The addition of a terminating resistor RT, reduces the external thermal noise but increases the resulting NF. The NF is increased because the RT reduces the input signal amplitude thus reducing the input SNR. (3) 15 www.national.com LMH6654/LMH6655 (4) ROPT is the point at which the NF curve reaches a minimum and is approximated by: ROPT (en/in) The noise figure is related to the equivalent source resistance (Rseq) and the parallel combination of Rf and Rg. To minimize noise figure, the following steps are recommended: 1. Minimize Rf||Rg 2. Choose the Optimum Rs (ROPT) www.national.com 16 LMH6654/LMH6655 Physical Dimensions inches (millimeters) unless otherwise noted 8-Pin SOIC NS Package Number M08A 5-Pin SOT-23 NS Package Number MF05A 17 www.national.com LMH6654/LMH6655 8-Pin MSOP NS Package Number MUA08A www.national.com 18 LMH6654/LMH6655 Notes 19 www.national.com LMH6654/LMH6655 Single/Dual Low Power, 250 MHz, Low Noise Amplifiers Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Design Support Amplifiers www.national.com/amplifiers WEBENCH(R) Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage Reference www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Solutions www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise(R) Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagicTM www.national.com/solarmagic Wireless (PLL/VCO) www.national.com/wireless www.national.com/training PowerWise(R) Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. 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