LMV710M5 datasheet(13/25 Pages) TI1

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LMV710-N, LMV711-N, LMV715-N

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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 fp , 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 fp 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 fp occurs at least 2 octaves beyond the expected −3 dB frequency corner

of the close loop frequency response. If not, a feedback capacitor CF can be placed in parallel with RF such that

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LMV710M5 Datasheet(PDF) 13 Page - Texas Instruments