LMC7111_14 Datasheet, PDF (17/26 Pages) National Semiconductor (TI) – LMC7111 Tiny CMOS Operational Amplifier with Rail-to-Rail Input and Output

LMC7111
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SNOS753E – AUGUST 1999 – REVISED MARCH 2013
BIASING GaAs RF AMPLIFIERS
The capacitive load capability, low current draw, and small size of the SOT-23 LMC7111 make it a good choice
for providing a stable negative bias to other integrated circuits.
The very small size of the LMC7111 and the LM4040 reference take up very little board space.
C_F and R_isolation prevent oscillations when driving capacitive loads.
Figure 55. Stable Negative Bias
REFERENCE BUFFER FOR A-TO-D CONVERTERS
The LMC7111 can be used as a voltage reference buffer for analog-to-digital converters. This works best for A-
to-D converters whose reference input is a static load, such as dual slope integrating A-to-Ds. Converters whose
reference input is a dynamic load (the reference current changes with time) may need a faster device, such as
the LMC7101 or the LMC7131.
The small size of the LMC7111 allows it to be placed close to the reference input. The low supply current (25 μA
typical) saves power.
For A-to-D reference inputs which require higher accuracy and lower offset voltage, please see the LMC6462
datasheet. The LMC6462 has performance similar to the LMC7111. The LMC6462 is available in two grades with
reduced input voltage offset.
DUAL AND QUAD DEVICES WITH SIMILAR PERFORMANCE
The LMC6462 and LMC6464 are dual and quad devices with performance similar to the LMC7111. They are
available in both conventional through-hole and surface mount packaging. Please see the LMC6462/4 datasheet
for details.
SPICE MACROMODEL
A SPICE macromodel is available for the LMC7111. This model includes simulation of:
• Input common-mode voltage range
• Frequency and transient response
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