LMC6482IMM Datasheet, PDF (22/35 Pages) Texas Instruments – LMC6482 CMOS Dual Rail-To-Rail Input and Output Operational Amplifier

LMC6482
SNOS674D – NOVEMBER 1997 – REVISED MARCH 2013
V+
R4
500 k:
V_IN
1 k:
500 k:
V-
R3
1 M:
499:
V-
5V
-
1
LMC6482
2
+
-5V
V_{OUT R4}
V_IN
=-
R3
V_OUT
Figure 69. Inverting Configuration Offset Voltage Adjustment
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Figure 70. Non-Inverting Configuration Offset Voltage Adjustment
UPGRADING APPLICATIONS
The LMC6484 quads and LMC6482 duals have industry standard pin outs to retrofit existing applications.
System performance can be greatly increased by the LMC6482's features. The key benefit of designing in the
LMC6482 is increased linear signal range. Most op-amps have limited input common mode ranges. Signals that
exceed this range generate a non-linear output response that persists long after the input signal returns to the
common mode range.
Linear signal range is vital in applications such as filters where signal peaking can exceed input common mode
ranges resulting in output phase inversion or severe distortion.
DATA ACQUISITION SYSTEMS
Low power, single supply data acquisition system solutions are provided by buffering the ADC12038 with the
LMC6482 (Figure 71). Capable of using the full supply range, the LMC6482 does not require input signals to be
scaled down to meet limited common mode voltage ranges. The LMC4282 CMRR of 82dB maintains integral
linearity of a 12-bit data acquisition system to ±0.325 LSB. Other rail-to-rail input amplifiers with only 50dB of
CMRR will degrade the accuracy of the data acquisition system to only 8 bits.
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