LM6482 National Semiconductor, LM6482 Datasheet - Page 15

• Manufacturer Part Number: LM6482
• Description: CMOS Dual Rail-To-Rail Input and Output Operational Amplifier
• Manufacturer: National Semiconductor

Application Information
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
configurations with V
±
2.5 mV of adjustment range, referred to the input, for both
FIGURE 12. Inverting Configuration
Offset Voltage Adjustment
S
=
±
5V.
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8.0 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 in-
creased linear signal range. Most op-amps have limited in-
put common mode ranges. Signals that exceed this range
generate a non-linear output response that persists long af-
ter 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 inverison or severe distor-
tion.
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 82 dB maintains integral linearity of a
12-bit data acquisition system to
rail-to-rail input amplifiers with only 50 dB of CMRR will de-
grade the accuracy of the data acquisition system to only 8
bits.
FIGURE 13. Non-Inverting Configuration
Offset Voltage Adjustment
±
0.325 LSB. Other
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