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LMC6492, LMC6494

www.ti.com

SNOS724D –AUGUST 2000–REVISED MARCH 2013

LMC6492 Dual/LMC6494 Quad CMOS Rail-to-Rail Input and Output Operational Amplifier

Check for Samples: LMC6492, LMC6494

FEATURES

DESCRIPTION

The LMC6492/LMC6494 amplifiers were specifically

(Typical Unless Otherwise Noted)

developed for single supply applications that operate

• Rail-to-Rail Input Common-Mode Voltage

from −40°C to +125°C. This feature is well-suited for

Range, Ensured Over Temperature

automotive systems because of the wide temperature

• Rail-to-Rail Output Swing within 20 mV of

range. A unique design topology enables the

LMC6492/LMC6494 common-mode voltage range to

Supply Rail, 100 kΩ Load

accommodate input signals beyond the rails. This

• Operates from 5V to 15V Supply

eliminates non-linear output errors due to input

• Excellent CMRR and PSRR 82 dB

signals exceeding a traditionally limited common-

• Ultra Low Input Current 150 fA

mode voltage range. The LMC6492/LMC6494 signal

range has a high CMRR of 82 dB for excellent

• High Voltage Gain (R

= 100 kΩ) 120 dB

accuracy in non-inverting circuit configurations.

• Low Supply Current (@ V

= 5V) 500

The LMC6492/LMC6494 rail-to-rail input is

μA/Amplifier

complemented by rail-to-rail output swing. This

• Low Offset Voltage Drift 1.0 μV/°C

assures maximum dynamic signal range which is

particularly important in 5V systems.

APPLICATIONS

Ultra-low input current of 150 fA and 120 dB open

• Automotive Transducer Amplifier

loop gain provide high accuracy and direct interfacing

• Pressure Sensor

with high impedance sources.

• Oxygen Sensor

• Temperature Sensor

• Speed Sensor

Connection Diagram

Figure 1. 8-Pin PDIP/SOIC - Top View Figure 2. 14-Pin PDIP/SOIC - Top View

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.

2All 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.

Summary of content (28 pages)

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LMC6492, LMC6494 www.ti.
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LMC6492, LMC6494 SNOS724D – AUGUST 2000 – REVISED MARCH 2013 www.ti.com 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. Absolute Maximum Ratings (1) (2) ESD Tolerance (3) 2000V Differential Input Voltage ±Supply Voltage (V+) + 0.3V, (V−) − 0.
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LMC6492, LMC6494 www.ti.com SNOS724D – AUGUST 2000 – REVISED MARCH 2013 DC Electrical Characteristics (continued) Unless otherwise specified, all limits specified for TJ = 25°C, V+ = 5V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ.
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LMC6492, LMC6494 SNOS724D – AUGUST 2000 – REVISED MARCH 2013 www.ti.com DC Electrical Characteristics (continued) Unless otherwise specified, all limits specified for TJ = 25°C, V+ = 5V, V− = 0V, VCM = VO = V+/2 and RL > 1 MΩ. Boldface limits apply at the temperature extremes Symbol Parameter Typ (1) Conditions LMC6492AE LMC6492BE LMC6494AE LMC6494BE Limit IS Supply Current LMC6492 1.0 V+ = +5V, VO = V+/2 LMC6492 + 1.3 + V = +15V, VO = V /2 LMC6494 2.0 V+ = +5V, VO = V+/2 LMC6494 2.
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LMC6492, LMC6494 www.ti.com SNOS724D – AUGUST 2000 – REVISED MARCH 2013 Typical Performance Characteristics VS = +15V, Single Supply, TA = 25°C unless otherwise specified Supply Current vs Supply Voltage Input Current vs Temperature Figure 3. Figure 4. Sourcing Current vs Output Voltage Sourcing Current vs Output Voltage Figure 5. Figure 6. Sourcing Current vs Output Voltage Sinking Current vs Output Voltage Figure 7. Figure 8.
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LMC6492, LMC6494 SNOS724D – AUGUST 2000 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) VS = +15V, Single Supply, TA = 25°C unless otherwise specified 6 Sinking Current vs Output Voltage Sinking Current vs Output Voltage Figure 9. Figure 10. Output Voltage Swing vs Supply Voltage Input Voltage Noise vs Frequency Figure 11. Figure 12. Input Voltage Noise vs Input Voltage Input Voltage Noise vs Input Voltage Figure 13. Figure 14.
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LMC6492, LMC6494 www.ti.com SNOS724D – AUGUST 2000 – REVISED MARCH 2013 Typical Performance Characteristics (continued) VS = +15V, Single Supply, TA = 25°C unless otherwise specified Input Voltage Noise vs Input Voltage Crosstalk Rejection vs Frequency Figure 15. Figure 16. Crosstalk Rejection vs Frequency Positive PSRR vs Frequency Figure 17. Figure 18. Negative PSRR vs Frequency CMRR vs Frequency Figure 19. Figure 20.
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LMC6492, LMC6494 SNOS724D – AUGUST 2000 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) VS = +15V, Single Supply, TA = 25°C unless otherwise specified 8 CMRR vs Input Voltage CMRR vs Input Voltage Figure 21. Figure 22. CMRR vs Input Voltage ΔVOS vs CMR Figure 23. Figure 24. ΔVOS vs CMR Input Voltage vs Output Voltage Figure 25. Figure 26.
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LMC6492, LMC6494 www.ti.com SNOS724D – AUGUST 2000 – REVISED MARCH 2013 Typical Performance Characteristics (continued) VS = +15V, Single Supply, TA = 25°C unless otherwise specified Input Voltage vs Output Voltage Open Loop Frequency Response Figure 27. Figure 28. Open Loop Frequency Response Open Loop Frequency Response vs Temperature Figure 29. Figure 30. Maximum Output Swing vs Frequency Gain and Phase vs Capacitive Load Figure 31. Figure 32.
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LMC6492, LMC6494 SNOS724D – AUGUST 2000 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) VS = +15V, Single Supply, TA = 25°C unless otherwise specified 10 Gain and Phase vs Capacitive Load Open Loop Output Impedance vs Frequency Figure 33. Figure 34. Open Loop Output Impedance vs Frequency Slew Rate vs Supply Voltage Figure 35. Figure 36. Non-Inverting Large Signal Pulse Response Non-Inverting Large Signal Pulse Response Figure 37. Figure 38.
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LMC6492, LMC6494 www.ti.com SNOS724D – AUGUST 2000 – REVISED MARCH 2013 Typical Performance Characteristics (continued) VS = +15V, Single Supply, TA = 25°C unless otherwise specified Non-Inverting Large Signal Pulse Response Non-Inverting Small Signal Pulse Response Figure 39. Figure 40. Non-Inverting Small Signal Pulse Response Non-Inverting Small Signal Pulse Response Figure 41. Figure 42. Inverting Large Signal Pulse Response Inverting Large Signal Pulse Response Figure 43. Figure 44.
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LMC6492, LMC6494 SNOS724D – AUGUST 2000 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) VS = +15V, Single Supply, TA = 25°C unless otherwise specified 12 Inverting Large Signal Pulse Response Inverting Small Signal Pulse Response Figure 45. Figure 46. Inverting Small Signal Pulse Response Inverting Small Signal Pulse Response Figure 47. Figure 48. Stability vs Capacitive Load Stability vs Capacitive Load Figure 49. Figure 50.
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LMC6492, LMC6494 www.ti.com SNOS724D – AUGUST 2000 – REVISED MARCH 2013 Typical Performance Characteristics (continued) VS = +15V, Single Supply, TA = 25°C unless otherwise specified Stability vs Capacitive Load Stability vs Capacitive Load Figure 51. Figure 52. Stability vs Capacitive Load Stability vs Capacitive Load Figure 53. Figure 54.
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LMC6492, LMC6494 SNOS724D – AUGUST 2000 – REVISED MARCH 2013 www.ti.com APPLICATION HINTS INPUT COMMON-MODE VOLTAGE RANGE Unlike Bi-FET amplifier designs, the LMC6492/4 does not exhibit phase inversion when an input voltage exceeds the negative supply voltage. Figure 55 shows an input voltage exceeding both supplies with no resulting phase inversion on the output. Figure 55.
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LMC6492, LMC6494 www.ti.com SNOS724D – AUGUST 2000 – REVISED MARCH 2013 Applications that exceed this rating must externally limit the maximum input current to ±5 mA with an input resistor (RI) as shown in Figure 57. Figure 57. RI Input Current Protection for Voltages Exceeding the Supply Voltages RAIL-TO-RAIL OUTPUT The approximate output resistance of the LMC6492/4 is 110Ω sourcing and 80Ω sinking at Vs = 5V.
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LMC6492, LMC6494 SNOS724D – AUGUST 2000 – REVISED MARCH 2013 www.ti.com Direct capacitive loading will reduce the phase margin of many op-amps. A pole in the feedback loop is created by the combination of the op-amp's output impedance and the capacitive load. This pole induces phase lag at the unity-gain crossover frequency of the amplifier resulting in either an oscillatory or underdamped pulse response.
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LMC6492, LMC6494 www.ti.com SNOS724D – AUGUST 2000 – REVISED MARCH 2013 Inverting Amplifier Non-Inverting Amplifier Follower Figure 61. Typical Connections of Guard Rings The designer should be aware that when it is inappropriate to lay out a PC board for the sake of just a few circuits, there is another technique which is even better than a guard ring on a PC board: Don't insert the amplifier's input pin into the board at all, but bend it up in the air and use only air as an insulator.
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LMC6492, LMC6494 SNOS724D – AUGUST 2000 – REVISED MARCH 2013 www.ti.com Application Circuits Where: V0 = V1 + V2 − V3 – V4 (V1 + V2 ≥ (V3 + V4) to keep V0 > 0VDC Figure 63. DC Summing Amplifier (VIN ≥ 0VDC and VO ≥ VDC For (CMRR depends on this resistor ratio match) As shown: VO = 2(V2 − V1) Figure 64. High Input Z, DC Differential Amplifier Figure 65.
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LMC6492, LMC6494 www.ti.com SNOS724D – AUGUST 2000 – REVISED MARCH 2013 If R1 = R5, R3 = R6, and R4 = R7; then ∴AV ≈ 100 for circuit shown (R2 = 9.3k). Figure 66. Instrumentation Amplifier Figure 67. Rail-to-Rail Single Supply Low Pass Filter This low-pass filter circuit can be used as an anti-aliasing filter with the same supply as the A/D converter. Filter designs can also take advantage of the LMC6492/4 ultra-low input current.
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LMC6492, LMC6494 SNOS724D – AUGUST 2000 – REVISED MARCH 2013 www.ti.com Rf = Rx Rf >> R1, R2, R3, and R4 Figure 69. Pressure Sensor In a manifold absolute pressure sensor application, a strain gauge is mounted on the intake manifold in the engine unit. Manifold pressure causes the sensing resistors, R1, R2, R3 and R4 to change. The resistors change in a way such that R2 and R4 increase by the same amount R1 and R3 decrease. This causes a differential voltage between the input of the amplifier.
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LMC6492, LMC6494 www.ti.com SNOS724D – AUGUST 2000 – REVISED MARCH 2013 REVISION HISTORY Changes from Revision C (March 2013) to Revision D • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 (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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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 LMC6492AEMX/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LMC6492BEMX SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LMC6492BEMX/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.
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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) LMC6492AEMX/NOPB SOIC D 8 2500 367.0 367.0 35.0 LMC6492BEMX SOIC D 8 2500 367.0 367.0 35.0 LMC6492BEMX/NOPB SOIC D 8 2500 367.0 367.0 35.0 LMC6494AEMX/NOPB SOIC D 14 2500 367.0 367.0 35.0 LMC6494BEMX SOIC D 14 2500 367.0 367.0 35.0 LMC6494BEMX/NOPB SOIC D 14 2500 367.0 367.0 35.
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