LMC6482QML_16 Datasheet, PDF (19/29 Pages) Texas Instruments – LMC6482QML CMOS Dual Rail-To-Rail Input and Output Operational Amplifier

LMC6482QML
www.ti.com
SNOSAR9A – DECEMBER 2010 – REVISED MARCH 2013
OFFSET VOLTAGE ADJUSTMENT
Offset voltage adjustment circuits are illustrated in Figure 64 Figure 65. 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.
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 64. Inverting Configuration
Offset Voltage Adjustment
Figure 65. 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 66). 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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