Datasheet

LMV710-N, LMV711-N, LMV715-N
www.ti.com SNOS519J –APRIL 2000–REVISED MARCH 2013
Figure 37.
Figure 38.
The inputs can be driven 300 mV beyond the supply rails without causing phase reversal at the output. However,
the inputs should not be allowed to exceed the maximum ratings.
Compensation of Input Capacitance
In the application (Figure 39) where a large feedback resistor is used, the feedback resistor can react with the
input capacitance of the op amp and introduce an additional pole to the close loop frequency response.
Figure 39. Cancelling the Effect of Input Capacitance
This pole occurs at frequency f
p
, where
(1)
Any stray capacitance due to external circuit board layout, any source capacitance from transducer or
photodiode connected to the summing node will also be added to the input capacitance. If f
p
is less than or close
to the unity-gain bandwidth (5 MHz) of the op amp, the phase margin of the loop is reduced and can cause the
system to be unstable.
To avoid this problem, make sure that f
p
occurs at least 2 octaves beyond the expected −3 dB frequency corner
of the close loop frequency response. If not, a feedback capacitor C
F
can be placed in parallel with R
F
such that
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