LMC6482_16 Datasheet, PDF (20/39 Pages) Texas Instruments – LMC6482 CMOS Dual Rail-to-Rail Input and Output Operational Amplifier

LMC6482
SNOS674E – NOVEMBER 1997 – REVISED APRIL 2015
8 Application and Implementation
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NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
8.1.1 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 features of the LMC6482. 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 nonlinear 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.
8.1.2 Data Acquisition Systems
Low power, single supply data acquisition system solutions are provided by buffering the ADC12038 with the
LMC6482 (Figure 56). 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 82 dB maintains integral
linearity of a 12-bit data acquisition system to ±0.325 LSB. Other rail-to-rail input amplifiers with only 50 dB of
CMRR will degrade the accuracy of the data acquisition system to only 8 bits.
Operating from the same supply voltage, the LMC6482 buffers the ADC12038 maintaining excellent accuracy.
Figure 56. Buffering the ADC12038 With the LMC6482
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