LMV771, LMV772, LMV774 www.ti.com SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010 LMV771/LMV772/LMV772Q/LMV774 Single/Dual/Quad, Low Offset, Low Noise, RRO Operational Amplifiers Check for Samples: LMV771, LMV772, LMV774 FEATURES 1 • 23 • • • • • • • • • • • • (Unless otherwise noted, typical values at VS = 2.7V) Guaranteed 2.7V and 5V specifications Maximum VOS (LMV771) 850μV (limit) Voltage noise f = 100 Hz 12.5nV/√Hz f = 10 kHz 7.5nV/√Hz Rail-to-Rail output swing RL = 600Ω 100mV from rail RL = 2kΩ 50mV from rail Open loop gain with RL = 2kΩ 100dB VCM 0 to V+ −0.9V Supply current (per amplifier) 550µA Gain bandwidth product 3.5MHz • • Temperature range −40°C to 125°C LMV772Q is AEC-Q100 Grade 1 qualified and is manufactured on Automotive grade flow APPLICATIONS • • • • • • • • Transducer amplifier Instrumentation amplifier Precision current sensing Data acquisition systems Active filters and buffers Sample and hold Portable/battery powered electronics Automotive DESCRIPTION The LMV771/LMV772/LMV772Q/LMV774 are Single, Dual, and Quad low noise precision operational amplifiers intended for use in a wide range of applications. Other important characteristics of the family include: an extended operating temperature range of −40°C to 125°C, the tiny SC70-5 package for the LMV771, and low input bias current. The extended temperature range of −40°C to 125°C allows the LMV771/LMV772/LMV772Q/LMV774 to accommodate a broad range of applications. The LMV771 expands National Semiconductor’s Silicon Dust™ amplifier portfolio offering enhancements in size, speed, and power savings. The LMV771/LMV772/LMV772Q/LMV774 are guaranteed to operate over the voltage range of 2.7V to 5.0V and all have rail-to-rail output. The LMV771/LMV772/LMV772Q/LMV774 family is designed for precision, low noise, low voltage, and miniature systems. These amplifiers provide rail-to-rail output swing into heavy loads. The maximum input offset voltage for the LMV771 is 850 μV at room temperature and the input common mode voltage range includes ground. The LMV771 is offered in the tiny SC70-5 package, LMV772/LMV772Q in the space saving MSOP-8 and SOIC8, and the LMV774 in TSSOP-14. 1 2 3 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Silicon Dust is a trademark of Texas Instruments. All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2004–2010, Texas Instruments Incorporated LMV771, LMV772, LMV774 SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010 www.ti.com Connection Diagram 1 5 +IN V + + 2 GND - -IN 4 3 VOUT Figure 1. SC70-5 (Top View) Instrumentation Amplifier V1 + V01 - R2 KR2 R1 R1 R11 = a + R1 V2 + VOUT V02 R2 KR2 VO = -K (2a + 1) (V1 - V2) (1) These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. 2 Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LMV771 LMV772 LMV774 LMV771, LMV772, LMV774 www.ti.com SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010 Absolute Maximum Ratings ESD Tolerance (1) (2) Machine Model 200V Human Body Model 2000V Differential Input Voltage ± Supply Voltage + Voltage at Input Pins (V ) + 0.3V, (V–) – 0.3V Current at Input Pins ±10 mA Supply Voltage (V+–V −) 5.75V + (3) − (4) Output Short Circuit to V Output Short Circuit to V Mounting Temperture Infrared or Convection (20 sec) 235°C Wave Soldering Lead Temp (10 sec) 260°C −65°C to 150°C Storage Temperature Range Junction Temperature (1) (2) (3) (4) (5) (5) 150°C 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. Human Body Model is 1.5 kΩ in series with 100 pF. Machine Model is 0Ω in series with 20 pF. Shorting output to V+ will adversely affect reliability. Shorting output to V− will adversely affect reliability. The maximum power dissipation is a function of TJ(MAX) , θJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(MAX)–T A) / θJA. All numbers apply for packages soldered directly into a PC board. Operating Ratings (1) Supply Voltage 2.7V to 5.5V −40°C to 125°C Temperature Range Thermal Resistance (θJA) (1) SC70-5 Package 440 °C/W 8-Pin MSOP 235°C/W 8-Pin SOIC 190°C/W 14-Pin TSSOP 155°C/W 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. Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LMV771 LMV772 LMV774 Submit Documentation Feedback 3 LMV771, LMV772, LMV774 SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010 2.7V DC Electrical Characteristics www.ti.com (1) Unless otherwise specified, all limits are guaranteed for TA = 25°C. V+ = 2.7V, V − = 0V, VCM = V+/2, VO = V+/2 and RL > 1MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Condition Min (2) LMV771 VOS Input Offset Voltage LMV772/LMV772Q/LMV774 TCVOS Max 0.3 0.85 1.0 0.3 1.0 1.2 (3) 0.004 100 pA 550 900 910 µA Input Offset Current IS Supply Current (Per Amplifier) CMRR Common Mode Rejection Ratio 0.5 ≤ VCM ≤ 1.2V 74 72 80 PSSR Power Supply Rejection Ratio 2.7V ≤ V+ ≤ 5V 82 76 90 VCM Input Common-Mode Voltage Range For CMRR ≥ 50dB VO IO (1) (2) (3) (4) (5) (6) (7) 4 (5) Output Swing Output Short Circuit Current µV/°C pA IOS (4) mV 100 250 Input Bias Current AV VCM = 1V Units −0.1 IB Large Signal Voltage Gain (2) −0.45 Input Offset Voltage Average Drift (4) Typ 0 dB dB 1.8 RL = 600Ω to 1.35V, VO = 0.2V to 2.5V, (6) 92 80 100 RL = 2kΩ to 1.35V, VO = 0.2V to 2.5V, (7) 98 86 100 RL = 600Ω to 1.35V VIN = ± 100mV, (6) 0.11 0.14 0.084 to 2.62 2.59 2.56 RL = 2kΩ to 1.35V VIN = ± 100mV, (7) 0.05 0.06 0.026 to 2.68 2.65 2.64 Sourcing, VO = 0V VIN = 100mV 18 11 24 Sinking, VO = 2.7V VIN = −100mV 18 11 22 V dB V mA Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating of the device such that TJ = TA. All limits are guaranteed by testing or statistical analysis. Typical values represent the most likely parametric norm. Limits guaranteed by design. RL is connected to mid-supply. The output voltage is set at 200mV from the rails. VO = GND + 0.2V and VO = V+ −0.2V For LMV772/LMV772Q/LMV774, temperature limits apply to −40°C to 85°C. For LMV772/LMV772Q/LMV774, temperature limits apply to −40°C to 85°C. If RL is relaxed to 10 kΩ, then for LMV772/LMV772Q/LMV774 temperature limits apply to −40°C to 125°C. Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LMV771 LMV772 LMV774 LMV771, LMV772, LMV774 www.ti.com SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010 2.7V AC Electrical Characteristics (1) Unless otherwise specified, all limits are guaranteed for TA = 25°C. V+ = 5.0V, V − = 0V, VCM = V+/2, VO = V+/2 and RL > 1MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter (4) SR Slew Rate GBW Gain-Bandwidth Product Φm Gm en Input-Referred Voltage Noise (Flatband) en in THD (1) (2) (3) (4) Conditions Min (2) AV = +1, RL = 10 kΩ Typ (3) Max (2) Units 1.4 V/µs 3.5 MHz Phase Margin 79 Deg Gain Margin −15 dB f = 10kHz 7.5 nV/√Hz Input-Referred Voltage Noise (l/f) f = 100Hz 12.5 nV/√Hz Input-Referred Current Noise f = 1kHz 0.001 pA/√Hz Total Harmonic Distortion f = 1kHz, AV = +1 RL = 600Ω, VIN = 1 VPP 0.007 % Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating of the device such that TJ = TA. All limits are guaranteed by testing or statistical analysis. Typical values represent the most likely parametric norm. The number specified is the slower of positive and negative slew rates. Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LMV771 LMV772 LMV774 Submit Documentation Feedback 5 LMV771, LMV772, LMV774 SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010 5.0V DC Electrical Characteristics www.ti.com (1) Unless otherwise specified, all limits are guaranteed for TA = 25°C. V+ = 5.0V, V − = 0V, VCM = V+/2, VO = V+/2 and RL > 1MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Condition Min (2) LMV771 VOS Input Offset Voltage LMV772/LMV772Q/LMV774 TCVOS Max 0.25 0.85 1.0 0.25 1.0 1.2 (3) 0.017 100 pA 600 950 960 µA Input Offset Current IS Supply Current (Per Amplifier) CMRR Common Mode Rejection Ratio 0.5 ≤ VCM ≤ 3.5V 80 79 90 PSRR Power Supply Rejection Ratio 2.7V ≤ V+ ≤ 5V 82 76 90 VCM Input Common-Mode Voltage Range For CMRR ≥ 50dB VO IO (1) (2) (3) (4) (5) (6) (7) (8) 6 (5) Output Swing Output Short Circuit Current (4) (8) µV/°C pA IOS (4) 0 dB dB 4.1 RL = 600Ω to 2.5V, VO = 0.2V to 4.8V, (6) 92 89 100 RL = 2kΩ to 2.5V, VO = 0.2V to 4.8V, 98 95 100 RL = 600Ω to 2.5V VIN = ± 100mV, (6) 0.15 0.23 0.112 to 4.9 4.85 4.77 RL = 2kΩ to 2.5V VIN = ± 100mV, (7) 0.06 0.07 0.035 to 4.97 4.94 4.93 Sourcing, VO = 0V VIN = 100mV 35 35 75 Sinking, VO = 2.7V VIN = −100mV 35 35 66 (7) mV 100 250 Input Bias Current AV VCM = 1V Units −0.23 IB Large Signal Voltage Gain (2) −0.35 Input Offset Voltage Average Drift (4) Typ V dB V mA Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating of the device such that TJ = TA. All limits are guaranteed by testing or statistical analysis. Typical values represent the most likely parametric norm. Limits guaranteed by design. RL is connected to mid-supply. The output voltage is set at 200mV from the rails. VO = GND + 0.2V and VO = V+ −0.2V For LMV772/LMV772Q/LMV774, temperature limits apply to −40°C to 85°C. For LMV772/LMV772Q/LMV774, temperature limits apply to −40°C to 85°C. If RL is relaxed to 10 kΩ, then for LMV772/LMV772Q/LMV774 temperature limits apply to −40°C to 125°C. Continuous operation of the device with an output short circuit current larger than 35mA may cause permanent damage to the device. Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LMV771 LMV772 LMV774 LMV771, LMV772, LMV774 www.ti.com SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010 5.0V AC Electrical Characteristics (1) Unless otherwise specified, all limits are guaranteed for TA = 25°C. V+ = 5.0V, V − = 0V, VCM = V+/2, VO = V+/2 and RL > 1MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter (4) SR Slew Rate GBW Gain-Bandwidth Product Φm Gm en Input-Referred Voltage Noise (Flatband) en in THD (1) (2) (3) (4) Conditions Min (2) AV = +1, RL = 10 kΩ Typ (3) Max (2) Units 1.4 V/µs 3.5 MHz Phase Margin 79 Deg Gain Margin −15 dB f = 10kHz 6.5 nV/√Hz Input-Referred Voltage Noise (l/f) f = 100Hz 12 nV/√Hz Input-Referred Current Noise f = 1kHz 0.001 pA/√Hz Total Harmonic Distortion f = 1kHz, AV = +1 RL = 600Ω, VIN = 1 VPP 0.007 % Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating of the device such that TJ = TA. All limits are guaranteed by testing or statistical analysis. Typical values represent the most likely parametric norm. The number specified is the slower of positive and negative slew rates. Connection Diagrams 1 5 +IN V 2 + + GND - -IN 3 4 VOUT Figure 2. SC70-5 (Top View) Figure 3. 8-Pin MSOP/SOIC (Top View) Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LMV771 LMV772 LMV774 Figure 4. 14-Pin TSSOP (Top View) Submit Documentation Feedback 7 LMV771, LMV772, LMV774 SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010 www.ti.com Typical Performance Characteristics VOS vs. VCM Over Temperature VOS vs. VCM Over Temperature 4 3 VS = 2.7V -40°C 2.5 -40°C 25°C 25°C 3 85°C 2 2.5 85°C 125°C 1.5 VOS (mV) VOS (mV) VS = 5V 3.5 125°C 1 0.5 2 1.5 1 0.5 0 0 -0.5 -1 -0.5 -0.5 0 0.5 1.5 1 2 -1 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 4 2.5 VCM (V) VCM (V) Output Swing vs. VS Output Swing vs. VS 4.5 5 40 120 RL = 2k: NEGATIVE SWING VOUT FROM VSUPPLY (mV) VOUT FROM VSUPPLY (mV) 110 100 90 80 POSITIVE SWING 70 60 50 40 2.5 RL = 600: TA = 25°C 35 NEGATIVE SWING 30 POSITIVE SWING 25 TA = 25°C 3 3.5 4.5 4 5 20 2.5 5.5 3 3.5 Output Swing vs. VS 4.5 5 5.5 IS vs. VS Over Temperature 1 0.9 4 VS (V) VS (V) 0.7 -40°C NEGATIVE SWING 0.6 0.7 0.6 POSITIVE SWING 0.5 0.4 0.3 0.2 0.1 0 2.5 8 SUPPLY CURRENT (mA) - VOUT FROM V (mV) 0.8 RL = 100k: 3.5 25°C 0.4 85°C 125°C 0.3 0.2 0.1 TA = 25°C 3 0.5 4 4.5 VS (V) Submit Documentation Feedback 5 5.5 0 2.5 3 3.5 4 4.5 5 5.5 SUPPLY VOLTAGE (V) Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LMV771 LMV772 LMV774 LMV771, LMV772, LMV774 www.ti.com SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010 Typical Performance Characteristics (continued) VIN vs. VOUT VIN vs. VOUT 500 500 VS = ±1.35V 400 200 RL = 2k: 100 0 RL = 600: -100 -200 RL = 2k: 100 0 RL = 600: -100 -200 -300 -400 -400 -500 -1 0.5 0 0.5 1 1.5 -3 -2 -1 0 1 2 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) Sourcing Current vs. VOUT (1) Sourcing Current vs. VOUT (1) 3 0 0 VS = 2.7V -5 -10 VS = 5V -20 -15 ISOURCE (mA) -10 ISOURCE (mA) 200 -300 -500 -1.5 TA = 25°C 300 INPUT VOLTAGE (PV) INPUT VOLTAGE (PV) 300 VS = ±2.5V 400 TA = 25°C 125°C -20 85°C -25 -30 -30 -50 25°C 85°C -60 -70 -35 125°C -40 25°C -80 -40 -40°C -90 -40°C -100 -45 0 1 0.5 1.5 2 2.5 3 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 - - VOUT FROM V (V) VOUT FROM V (V) Sinking Current vs. VOUT (2) Sinking Current vs. VOUT (2) 100 40 VS = 2.7V -40°C -40°C 90 80 25°C 25°C 70 ISINK (mA) ISINK (mA) 30 85°C 20 60 50 125°C 40 85°C 125°C 30 10 20 10 VS = 5V 0 0 0 0.5 1 1.5 2 2.5 3 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 + VOUT REFERENCED TO V (V) (1) (2) VOUT FROM V + Continuous operation of the device with an output short circuit current larger than 35mA may cause permanent damage to the device. Continuous operation of the device with an output short circuit current larger than 35mA may cause permanent damage to the device. Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LMV771 LMV772 LMV774 Submit Documentation Feedback 9 LMV771, LMV772, LMV774 SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010 www.ti.com Typical Performance Characteristics (continued) Input Voltage Noise vs. Frequency Input Bias Current Over Temperature INPUT VOLTAGE NOISE (nV/ Hz) 35 30 25 20 15 VS = 2.7V 10 VS = 5V 5 0 10 100 1k 10k FREQUENCY (Hz) Input Bias Current Over Temperature Input Bias Current Over Temperature 500 50 T = 25°C 300 200 100 VS = 2.7V 0 -100 VS = 5V -200 -300 T = -40°C 40 INPUT BIAS CURRENT (fA) INPUT BIAS CURRENT (fA) 400 30 20 VS = 2.7V 10 0 -10 -20 VS = 5V -30 -400 -40 -500 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 -50 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 VCM (V) VCM (V) THD+N vs. Frequency THD+N vs. VOUT 10 1 RL = 600: THD+N (%) VS = 5V, VO = 2.5VPP VS = 2.7V, VO = 1VPP 0.1 AV = +1 THD+N (%) AV = +10 1 AV = +10 0.1 VS = 2.7V 0.01 0.01 AV = +1 VS = 5V, VO = 1VPP VS = 5V VS = 2.7V, VO = 1VPP 0.001 10 100 1k 10k 100k 0.001 0.1 FREQUENCY (Hz) 10 Submit Documentation Feedback 1 10 VOUT (VPP) Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LMV771 LMV772 LMV774 LMV771, LMV772, LMV774 www.ti.com SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010 Typical Performance Characteristics (continued) Slew Rate vs. Supply Voltage Open Loop Frequency Response Over Temperature 2 RL = 10k: 90 80 60 VIN = 2VPP 25°C 1.7 70 50 1.6 RISING EDGE 1.5 1.4 125°C GAIN 40 60 50 30 -40°C 40 20 125°C FALLING EDGE 1.2 0 1.1 -10 3.5 4 4.5 20 VS = 5V 25°C RL = 2k: -20 1k 10k 5 SUPPLY VOLTAGE (V) 60 RL = 100k: GAIN (dB) 50 GAIN 40 100 80 90 70 80 60 70 50 50 30 RL = 100k: RL = 600: 10 0 RL = 2k: -10 VS = 2.7V -20 1k 10k 100k 1M 40 GAIN 40 50 RL = 600: 20 0 10 -10 0 -20 1k GAIN 80 90 70 80 60 70 50 60 30 50 20 40 -10 CL = 1000pF CL = 500pF CL = 0pF VS = 5V RL = 600: -20 1k 10k CL = 100pF 100k 0 10k 100k 1M 10M 1M 100 90 70 CL = 100pF GAIN 40 60 50 30 40 20 CL = 1000pF 10 20 0 10 -10 0 -20 1k 10M CL = 0pF 80 30 CL = 500pF VS = 5V 20 CL = 0pF RL = 100k: FREQUENCY (Hz) CL = 100pF 10 0 10k 100k 1M 10M FREQUENCY (Hz) Non-Inverting Large Signal Pulse Response TA = -40°C RL = 2k: OUTPUT SIGNAL VS = ±2.5V TA = -40°C RL = 2k: (1 V/div) INPUT SIGNAL VS = ±2.5V (50 mV/div) INPUT SIGNAL 10 VS = 5V 30 Non-Inverting Small Signal Pulse Response OUTPUT SIGNAL 20 PHASE GAIN (dB) GAIN (dB) CL = 100pF 0 30 RL = 2k: Open Loop Gain & Phase with Cap. Loading 100 PHASE (°) CL = 0pF 60 10 40 FREQUENCY (Hz) 80 50 60 RL = 100k: 20 FREQUENCY (Hz) PHASE 90 70 RL = 2k: 30 10 10M 100 80 RL = 600: 30 Open Loop Gain & Phase with Cap. Loading 70 0 10M RL = 100k: PHASE 60 RL = 2k: 20 1M Open Loop Frequency Response GAIN (dB) RL = 600: PHASE PHASE (°) 80 100k FREQUENCY (Hz) Open Loop Frequency Response 70 10 PHASE (°) 3 30 10 PHASE (°) 1.3 1 2.5 40 -40°C PHASE 70 GAIN (dB) SLEW RATE (V/Ps) 1.8 100 80 AV = +1 PHASE (°) 1.9 TIME (10 Ps/div) TIME (10 Ps/div) Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LMV771 LMV772 LMV774 Submit Documentation Feedback 11 LMV771, LMV772, LMV774 SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010 www.ti.com Typical Performance Characteristics (continued) INPUT SIGNAL Non-Inverting Large Signal Pulse Response TA = 25°C RL = 2k: OUTPUT SIGNAL VS = ±2.5V TA = 25°C RL = 2k: (1 V/div) VS = ±2.5V (50 mV/div) OUTPUT SIGNAL INPUT SIGNAL Non-Inverting Small Signal Pulse Response VS = ±2.5V TA = 125°C RL = 2k: (50 mV/div) OUTPUT SIGNAL INPUT SIGNAL OUTPUT SIGNAL (1 V/div) TIME (10 Ps/div) Non-Inverting Large Signal Pulse Response INPUT SIGNAL TIME (10 Ps/div) Non-Inverting Small Signal Pulse Response TIME (10 Ps/div) TA = -40°C RL = 2k: VS = ±2.5V TA = -40°C RL = 2k: (1 V/div) INPUT SIGNAL Inverting Large Signal Pulse Response OUTPUT SIGNAL INPUT SIGNAL VS = ±2.5V (50 mV/div) OUTPUT SIGNAL RL = 2k: TIME (10 Ps/div) Inverting Small Signal Pulse Response RL = 2k: OUTPUT SIGNAL VS = ±2.5V TA = 25°C RL = 2k: (1 V/div) TA = 25°C (50 mV/div) OUTPUT SIGNAL VS = ±2.5V INPUT SIGNAL TIME (10 Ps/div) Inverting Large Signal Pulse Response INPUT SIGNAL TIME (10 Ps/div) Inverting Small Signal Pulse Response TIME (10 Ps/div) 12 VS = ±2.5V TA = 125°C Submit Documentation Feedback TIME (10 Ps/div) Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LMV771 LMV772 LMV774 LMV771, LMV772, LMV774 www.ti.com SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010 Typical Performance Characteristics (continued) INPUT SIGNAL Inverting Large Signal Pulse Response TA = 125°C RL = 2k: OUTPUT SIGNAL VS = ±2.5V TA = 125°C RL = 2k: (1 V/div) VS = ±2.5V (50 mV/div) OUTPUT SIGNAL INPUT SIGNAL Inverting Small Signal Pulse Response TIME (10 Ps/div) TIME (10 Ps/div) Stability vs. VCM Stability vs. VCM 500 250 400 CAPACITIVE LOAD (pF) CAPACITIVE LOAD (pF) 450 350 25% OVERSHOOT 300 250 200 VS = ±2.5V 150 AV = +1 100 RL = 2k: 50 25% OVERSHOOT 150 100 VS = ±2.5V AV = +1 50 RL = 1M: VO = 100mV VO = 100mV 0 0 -2 -1.5 -1 -0.5 0 0.5 1 -2 1.5 -1.5 -1 -0.5 0 0.5 VCM (V) VCM (V) PSRR vs. Frequency CMRR vs. Frequency 1 1.5 100 140 RL = 100k: RL = 5 k: 90 120 80 VS = 2.7V, -PSRR 100 70 VS = 2.7V, +PSRR 80 CMRR (dB) PSRR (dB) 200 VS = 5V, +PSRR 60 VS = 5V, -PSRR 50 40 30 40 VS = 5V 60 VS = 2.7V 20 20 10 0 100 1k 10k 100k 1M 0 100 1k 10k 100k 1M FREQUENCY (Hz) FREQUENCY (Hz) Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LMV771 LMV772 LMV774 Submit Documentation Feedback 13 LMV771, LMV772, LMV774 SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010 www.ti.com Typical Performance Characteristics (continued) Crosstalk Rejection vs. Frequency (LMV772/LMV772Q/LMV774) 140 VS = 5V CROSSTALK REJECTION (dB) 120 100 VS = 2.7V 80 60 40 20 0 100 1k 10k 100k 600k FREQUENCY (Hz) Application Note LMV771/LMV772/LMV772Q/LMV774 The LMV771/LMV772LMV772Q/LMV774 are a family of precision amplifiers with very low noise and ultra low offset voltage. LMV771/LMV772/LMV772Q/LMV774's extended temperature range of −40°C to 125°C enables the user to design this family of products into a variety of applications including automotive. The LMV771 has a maximum offset voltage of 1mV over the extended temperature range. This makes the LMV771 ideal for applications where precision is important. The LMV772/LMV772Q/LMV774 have a maximum offset voltage of 1mV at room temperature and 1.2mV over the extended temperature range of −40°C to 125°C. Care must be taken when the LMV772/LMV772Q/LMV774 are designed into applications with heavy loads under extreme temperature conditions. As indicated in the DC tables, the LMV772/LMV772Q/LMV774's gain and output swing may be reduced at temperatures between 85°C and 125°C with loads heavier than 2kΩ. INSTRUMENTATION AMPLIFIER Measurement of very small signals with an amplifier requires close attention to the input impedance of the amplifier, gain of the overall signal on the inputs, and the gain on each input since we are only interested in the difference of the two inputs and the common signal is considered noise. A classic solution is an instrumentation amplifier. Instrumentation amplifiers have a finite, accurate, and stable gain. Also they have extremely high input impedances and very low output impedances. Finally they have an extremely high CMRR so that the amplifier can only respond to the differential signal. A typical instrumentation amplifier is shown in Figure 5. V1 + V01 - R2 KR2 R1 R1 R11 = a + VOUT R1 V2 + V02 R2 KR2 Figure 5. Instrumentation Amplifier 14 Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LMV771 LMV772 LMV774 LMV771, LMV772, LMV774 www.ti.com SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010 There are two stages in this amplifier. The last stage, output stage, is a differential amplifier. In an ideal case the two amplifiers of the first stage, input stage, would be set up as buffers to isolate the inputs. However they cannot be connected as followers because of real amplifier's mismatch. That is why there is a balancing resistor between the two. The product of the two stages of gain will give the gain of the instrumentation amplifier. Ideally, the CMRR should be infinite. However the output stage has a small non-zero common mode gain which results from resistor mismatch. In the input stage of the circuit, current is the same across all resistors. This is due to the high input impedance and low input bias current of the LMV771. With the node equations we have: GIVEN: I R = I R 11 1 (2) By Ohm’s Law: VO1 - VO2 = (2R1 + R11) IR 11 = (2a + 1) R11 x IR 11 = (2a + 1) V R 11 (3) However: VR 11 = V1 - V2 (4) So we have: (5) Now looking at the output of the instrumentation amplifier: KR2 VO = R2 (VO2 - VO1) = -K (VO1 - VO2) (6) Substituting from Equation 5: VO = -K (2a + 1) (V1 - V2) (7) This shows the gain of the instrumentation amplifier to be: −K(2a+1) (8) Typical values for this circuit can be obtained by setting: a = 12 and K= 4. This results in an overall gain of −100. Figure 6 shows typical CMRR characteristics of this Instrumentation amplifier over frequency. Three LMV771 amplifiers are used along with 1% resistors to minimize resistor mismatch. Resistors used to build the circuit are: R1 = 21.6kΩ, R11 = 1.8kΩ, R2 = 2.5kΩ with K = 40 and a = 12. This results in an overall gain of −1000, −K(2a+1) = −1000. 0 VS = ±2.5V -20 VCM = 0V VIN = 3VPP CMRR (dB) -40 -60 -80 -100 -120 -140 10 100 1k 10k FREQUENCY (Hz) Figure 6. CMRR vs. Frequency Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LMV771 LMV772 LMV774 Submit Documentation Feedback 15 LMV771, LMV772, LMV774 SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010 www.ti.com ACTIVE FILTER Active filters are circuits with amplifiers, resistors, and capacitors. The use of amplifiers instead of inductors, which are used in passive filters, enhances the circuit performance while reducing the size and complexity of the filter. The simplest active filters are designed using an inverting op amp configuration where at least one reactive element has been added to the configuration. This means that the op amp will provide "frequency-dependent" amplification, since reactive elements are frequency dependent devices. LOW PASS FILTER The following shows a very simple low pass filter. C R2 R1 Vi VOUT + Figure 7. Lowpass Filter The transfer function can be expressed as follows: By KCL: -Vi VO VO - R1 1 jwc - R2 =O (9) Simplifying this further results in: -R2 1 R1 jwcR2 +1 VO = Vi (10) or VO Vi -R2 1 R1 jwcR2 +1 = (11) Now, substituting ω=2πf, so that the calculations are in f(Hz) and not ω(rad/s), and setting the DC gain HO = −R2/R1 and H = VO/Vi H = HO 1 j2SfcR2 +1 (12) Set: fo = 1/(2πR1C) H = HO 1 1 + j (f/fo) (13) Low pass filters are known as lossy integrators because they only behave as an integrator at higher frequencies. Just by looking at the transfer function one can predict the general form of the bode plot. When the f/fO ratio is small, the capacitor is in effect an open circuit and the amplifier behaves at a set DC gain. Starting at fO, −3dB corner, the capacitor will have the dominant impedance and hence the circuit will behave as an integrator and the signal will be attenuated and eventually cut. The bode plot for this filter is shown in the following picture: 16 Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LMV771 LMV772 LMV774 LMV771, LMV772, LMV774 www.ti.com SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010 dB |H| |HO| -20dB/dec 0 f = fo f (Hz) Figure 8. Lowpass Filter Transfer Function HIGH PASS FILTER In a similar approach, one can derive the transfer function of a high pass filter. A typical first order high pass filter is shown below: C R1 R2 Vi VOUT + Figure 9. Highpass FIlter Writing the KCL for this circuit : (V1 denotes the voltage between C and R1) V1 - V V1 - Vi = 1 jwC - R1 (14) - - V + VO V + V1 = R1 R2 (15) Solving these two equations to find the transfer function and using: fO = 1 2SR1C (16) VO -R2 HO = (high frequency gain) R1 H= and Vi Which results: H = HO j (f/fo) 1 + j (f/fo) (17) Looking at the transfer function, it is clear that when f/fO is small, the capacitor is open and hence no signal is getting in to the amplifier. As the frequency increases the amplifier starts operating. At f = fO the capacitor behaves like a short circuit and the amplifier will have a constant, high frequency, gain of HO. Figure 10 shows the transfer function of this high pass filter: Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LMV771 LMV772 LMV774 Submit Documentation Feedback 17 LMV771, LMV772, LMV774 SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010 www.ti.com dB |H| |HO| -20dB/dec 0 f = fo f (Hz) Figure 10. Highpass Filter Transfer Function BAND PASS FILTER C2 C1 R2 R1 Vi VOUT + Figure 11. Bandpass Filter Combining a low pass filter and a high pass filter will generate a band pass filter. In this network the input impedance forms the high pass filter while the feedback impedance forms the low pass filter. Choosing the corner frequencies so that f1 < f2, then all the frequencies in between, f1 ≤ f ≤ f2, will pass through the filter while frequencies below f1 and above f2 will be cut off. The transfer function can be easily calculated using the same methodology as before. H = HO j (f/f1) [1 + j (f/f1)] [1 + j (f/f2)] (18) Where f1 = 1 2SR1C1 f2 = 1 2SR2C2 HO = -R2 R1 (19) The transfer function is presented in the following figure. 18 Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LMV771 LMV772 LMV774 LMV771, LMV772, LMV774 www.ti.com SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010 |H | dB |HO| -20dB/dec 20dB/dec 0 f1 f (Hz) f2 Figure 12. Bandpass filter Transfer Function STATE VARIABLE ACTIVE FILTER State variable active filters are circuits that can simultaneously represent high pass, band pass, and low pass filters. The state variable active filter uses three separate amplifiers to achieve this task. A typical state variable active filter is shown in Figure 13. The first amplifier in the circuit is connected as a gain stage. The second and third amplifiers are connected as integrators, which means they behave as low pass filters. The feedback path from the output of the third amplifier to the first amplifier enables this low frequency signal to be fed back with a finite and fairly low closed loop gain. This is while the high frequency signal on the input is still gained up by the open loop gain of the 1st amplifier. This makes the first amplifier a high pass filter. The high pass signal is then fed into a low pass filter. The outcome is a band pass signal, meaning the second amplifier is a band pass filter. This signal is then fed into the third amplifiers input and so, the third amplifier behaves as a simple low pass filter. R4 R1 C2 VIN R2 - A1 R5 C3 R3 VHP + - A2 VBP + A3 + VLP R6 Figure 13. State Variable Active Filter The transfer function of each filter needs to be calculated. The derivations will be more trivial if each stage of the filter is shown on its own. The three components are: R4 R1 VO R5 VIN A1 + VO1 R6 VO2 Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LMV771 LMV772 LMV774 Submit Documentation Feedback 19 LMV771, LMV772, LMV774 SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010 www.ti.com C2 R2 VO1 A2 VO2 + C3 R3 VO2 A3 V O + For A1 the relationship between input and output is: R6 R1 + R4 R5 + R6 R1 -R4 VO1 = R1 V0 + VIN + R5 R1 + R4 R5 + R6 R1 VO2 (20) This relationship depends on the output of all the filters. The input-output relationship for A2 can be expressed as: VO2 = -1 VO1 s C 2R 2 (21) And finally this relationship for A3 is as follows: VO = -1 VO2 s C 3R 3 (22) Re-arranging these equations, one can find the relationship between VO and VIN (transfer function of the lowpass filter), VO1 and VIN (transfer function of the highpass filter), and VO2 and VIN (transfer function of the bandpass filter) These relationships are as follows: Lowpass Filter R 1 + R4 R1 VO VIN R6 1 R5 + R6 C2C3R2R3 = 1 R5 R1 + R4 C 2R 2 R5 + R6 R1 2 s +s 1 + C2C3R2R3 (23) Highpass Filter s VO1 VIN 2 R1 + R 4 R6 R1 R5 + R6 = 1 R5 R1 + R4 C 2R 2 R5 + R6 R1 2 s +s 1 + C2C3R2R3 (24) Bandpass Filter 1 R1 + R 4 R6 C 2R 2 R1 R5 + R6 s VO2 VIN = 2 s +s 1 R5 R1 + R4 C 2R 2 R5 + R6 R1 1 + C2C3R2R3 (25) The center frequency and Quality Factor for all of these filters is the same. The values can be calculated in the following manner: 20 Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LMV771 LMV772 LMV774 LMV771, LMV772, LMV774 www.ti.com SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010 1 Zc = C 2 C 3R 2R 3 and Q= C 2R 2 R5 + R6 R1 C 3R 3 R6 R1 + R 4 (26) A design example is shown here: Designing a bandpass filter with center frequency of 10kHz and Quality Factor of 5.5 To do this, first consider the Quality Factor. It is best to pick convenient values for the capacitors. C2 = C3 = 1000pF. Also, choose R1 = R4 = 30kΩ. Now values of R5 and R6 need to be calculated. With the chosen values for the capacitors and resistors, Q reduces to: Q= 1 11 = 2 2 R5 + R6 R6 (27) or R5 = 10R6 R6 = 1.5kΩ R5 = 15kΩ (28) Also, for f = 10kHz, the center frequency is ωc = 2πf = 62.8kHz. Using the expressions above, the appropriate resistor values will be R2 = R3 = 16kΩ. The following graphs show the transfer function of each of the filters. The DC gain of this circuit is: DC GAIN = R1 + R4 R6 R1 R 5 + R6 = -14.8 dB The frequency responses of each stage of the state variable active filter when implemented with the LMV774 are shown in the following figures: 0 -10 -20 GAIN (dB) -30 -40 -50 -60 -70 -80 -90 -100 100 1k 10k 100k 400k FREQUENCY (Hz) Figure 14. Lowpass Filter Frequency Response Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LMV771 LMV772 LMV774 Submit Documentation Feedback 21 LMV771, LMV772, LMV774 SNOSA04F – MAY 2004 – REVISED SEPTEMBER 2010 www.ti.com 0 -10 -20 GAIN (dB) -30 -40 -50 -60 -70 -80 -90 -100 100 1k 10k 100k 400k FREQUENCY (Hz) Figure 15. Bandpass Filter Frequency Response 0 -10 -20 GAIN (dB) -30 -40 -50 -60 -70 -80 -90 -100 100 1k 10k 100k 400k FREQUENCY (Hz) Figure 16. Highpass Filter Frequency Response 22 Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LMV771 LMV772 LMV774 PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LMV771MG NRND SC70 DCK 5 1000 TBD Call TI Call TI -40 to 125 A75 LMV771MG/NOPB ACTIVE SC70 DCK 5 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 A75 LMV771MGX/NOPB ACTIVE SC70 DCK 5 3000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 A75 LMV772MA NRND SOIC D 8 95 TBD Call TI Call TI -40 to 125 LMV7 72MA LMV772MA/NOPB ACTIVE SOIC D 8 95 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 LMV7 72MA LMV772MAX NRND SOIC D 8 2500 TBD Call TI Call TI -40 to 125 LMV7 72MA LMV772MAX/NOPB ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 LMV7 72MA LMV772MM NRND VSSOP DGK 8 1000 TBD Call TI Call TI -40 to 125 A91A LMV772MM/NOPB ACTIVE VSSOP DGK 8 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 A91A LMV772MMX NRND VSSOP DGK 8 3500 TBD Call TI Call TI -40 to 125 A91A LMV772MMX/NOPB ACTIVE VSSOP DGK 8 3500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 A91A LMV772QMM/NOPB ACTIVE VSSOP DGK 8 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 AJ7A LMV772QMMX/NOPB ACTIVE VSSOP DGK 8 3500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 AJ7A LMV774MT NRND TSSOP PW 14 94 TBD Call TI Call TI -40 to 125 LMV77 4MT LMV774MT/NOPB ACTIVE TSSOP PW 14 94 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 LMV77 4MT LMV774MTX/NOPB ACTIVE TSSOP PW 14 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 LMV77 4MT (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. Addendum-Page 1 Samples PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. 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OTHER QUALIFIED VERSIONS OF LMV772, LMV772-Q1 : • Catalog: LMV772 • Automotive: LMV772-Q1 NOTE: Qualified Version Definitions: • Catalog - TI's standard catalog product Addendum-Page 2 PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 • Automotive - Q100 devices qualified for high-reliability automotive applications targeting zero defects Addendum-Page 3 PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LMV771MG SC70 DCK 5 1000 178.0 8.4 2.25 2.45 1.2 4.0 8.0 Q3 LMV771MG/NOPB SC70 DCK 5 1000 178.0 8.4 2.25 2.45 1.2 4.0 8.0 Q3 LMV771MGX/NOPB SC70 DCK 5 3000 178.0 8.4 2.25 2.45 1.2 4.0 8.0 Q3 LMV772MAX SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LMV772MAX/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LMV772MM VSSOP DGK 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 LMV772MM/NOPB VSSOP DGK 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 LMV772MMX VSSOP DGK 8 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 LMV772MMX/NOPB VSSOP DGK 8 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 LMV772QMM/NOPB VSSOP DGK 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 LMV772QMMX/NOPB VSSOP DGK 8 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMV771MG SC70 DCK 5 1000 210.0 185.0 35.0 LMV771MG/NOPB SC70 DCK 5 1000 210.0 185.0 35.0 LMV771MGX/NOPB SC70 DCK 5 3000 210.0 185.0 35.0 LMV772MAX SOIC D 8 2500 367.0 367.0 35.0 LMV772MAX/NOPB SOIC D 8 2500 367.0 367.0 35.0 LMV772MM VSSOP DGK 8 1000 210.0 185.0 35.0 LMV772MM/NOPB VSSOP DGK 8 1000 210.0 185.0 35.0 LMV772MMX VSSOP DGK 8 3500 367.0 367.0 35.0 LMV772MMX/NOPB VSSOP DGK 8 3500 367.0 367.0 35.0 LMV772QMM/NOPB VSSOP DGK 8 1000 210.0 185.0 35.0 LMV772QMMX/NOPB VSSOP DGK 8 3500 367.0 367.0 35.0 Pack Materials-Page 2 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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