ADA4932-2YCPZ-R2 datasheet(19/27 Pages) AD

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Data Sheet

ADA4932-1/ADA4932-2

THEORY OF OPERATION

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Rev. F | 19 of 27

The ADA4932-1/ADA4932-2 differ from conventional op amps in

that it has two outputs whose voltages move in opposite directions

and an additional input, VOCM. Like an op amp, it relies on high

open-loop gain and negative feedback to force these outputs to the

desired voltages. The ADA4932-1/ADA4932-2 behave much like

standard voltage feedback op amps and facilitates single-ended-

to-differential conversions, common-mode level shifting, and ampli-

fications of differential signals. Like an op amp, the ADA4932-1/

ADA4932-2 have high input impedance and low output impedance.

Because they use voltage feedback, the ADA4932-1/ADA4932-2

manifest a nominally constant gain bandwidth product.

Two feedback loops are employed to control the differential and

common-mode output voltages. The differential feedback, set with

external resistors, controls only the differential output voltage. The

common-mode feedback controls only the common-mode output

voltage. This architecture makes it easy to set the output common-

mode level to any arbitrary value within the specified limits. The out-

put common-mode voltage is forced, by the internal common-mode

feedback loop, to be equal to the voltage applied to the VOCM input.

The internal common-mode feedback loop produces outputs that

are highly balanced over a wide frequency range without requiring

tightly matched external components. This results in differential out-

puts that are very close to the ideal of being identical in amplitude

and are exactly 180° apart in phase.

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