LMC6482QML Datasheet, PDF (19/28 Pages) Texas Instruments – CMOS Dual Rail-To-Rail Input and Output Operational Amplifier

7.0 OFFSET VOLTAGE ADJUSTMENT
Offset voltage adjustment circuits are illustrated in Figure 12
Figure 13. Large value resistances and potentiometers are
used to reduce power consumption while providing typically
±2.5mV of adjustment range, referred to the input, for both
configurations with V_S = ±5V.
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FIGURE 12. Inverting Configuration
Offset Voltage Adjustment
8.0 UPGRADING APPLICATIONS
The LMC6484 quads and LMC6482 duals have industry stan-
dard pin outs to retrofit existing applications. System perfor-
mance can be greatly increased by the LMC6482's features.
The key benefit of designing in the LMC6482 is increased lin-
ear 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 re-
sulting in output phase inversion or severe distortion.
9.0 DATA ACQUISITION SYSTEMS
Low power, single supply data acquisition system solutions
are provided by buffering the ADC12038 with the LMC6482
(Figure 14). 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 am-
plifiers with only 50dB of CMRR will degrade the accuracy of
the data acquisition system to only 8 bits.
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FIGURE 13. Non-Inverting Configuration
Offset Voltage Adjustment
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