+

-

5V

-5V

R4

R3

V-

1

2

LMC6482

V-

V+

500 k:

1 k:

500 k:

499:

1 M:

= -

R4

R3

LMC6482

SNOS674D – NOVEMBER 1997 – REVISED MARCH 2013

www.ti.com

Figure 69. Inverting Configuration Offset Voltage Adjustment

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.

22

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