LMC6484 Datasheet, PDF (25/45 Pages) National Semiconductor (TI) – CMOS Quad Rail-to-Rail Input and Output Operational Amplifier

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8 Application and Implementation
LMC6484
SNOS675C – AUGUST 2000 – REVISED SEPTEMBER 2015
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 LMC6484. The key benefit of designing in
the LMC6484 is increased linear signal range. Most operational amplifiers 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.
8.1.2 Spice Macromodel
A spice macromodel is available for the LMC6484. This model includes accurate simulation of the following:
• Input common-mode voltage range
• Frequency and transient response
• GBW dependence on loading conditions
• Quiescent and dynamic supply current
• Output swing dependence on loading conditions
and many more characteristics as listed on the macromodel disk.
Contact your local Texas Instruments sales office to obtain an operational amplifier spice model library disk.
8.2 Typical Application
R_F
C_F
±
V_IN
+
R_O
V_OUT
C_L
Figure 48. Unity Gain Buffer for High-Capacitive Loads
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