Datasheet

LMP7721
SNOSAW6D –JANUARY 2008–REVISED MARCH 2013 www.ti.com
(4)
regardless of whether the amplifier is being used in inverting or non-inverting mode. Note that a feedback
capacitor is more likely to be needed when the noise gain is low and/or the feedback resistor is large.
If the above condition is met (indicating a feedback capacitor will probably be needed), and the noise gain is
large enough that:
(5)
the following value of feedback capacitor is recommended:
(6)
If
(7)
the feedback capacitor should be:
(8)
Note that these capacitor values are usually significant smaller than those given by the older, more conservative
formula:
(9)
Figure 47. General Operational Amplifier Circuit
NOTE
C
S
consists of the amplifier’s input capacitance plus any stray capacitance from the circuit
board and socket. C
F
compensates for the pole caused by C
S
and the feedback resistors.
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