ADA4930-1YCPZ-R7 datasheet(16/25 Pages) AD

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ADA4930-1/ADA4930-2

Data Sheet

Rev. D | Page 16 of 25

OPERATIONAL DESCRIPTION

DEFINITION OF TERMS

+IN

–IN

+OUT

–OUT

+DIN

–FB

+FB

–DIN

VOCM

VOUT, dm

RL, dm

ADA4930

Figure 42. Circuit Definitions

Differential Voltage

Differential voltagerefersto the difference between two

node voltages. For example, the output differential voltage (or,

equivalently, output differential-modevoltage)is defined as

VOUT, dm = (V+OUT − V−OUT)

where V+OUT and V−OUT refer to the voltages at the +OUTand

−OUT terminals with respect to a common reference.

Common-Mode Voltage

Common-modevoltagerefersto theaverageoftwonodevoltages.

The output common-modevoltageis defined as

VOUT, cm = (V+OUT + V−OUT)/2

Balance

Outputbalanceis a measureof howclosethedifferential signals are

to being equal in amplitudeandoppositein phase. Output balance

is most easily determined by placing a well-matched resistor

divider between thedifferential voltagenodesandcomparing the

magnitudeofthesignal atthedivider midpoint with the magnitude

of the differential signal (seeFigure39). Bythis definition,output

balance is the magnitudeoftheoutput common-mode voltage

divided bythemagnitudeoftheoutput differential mode voltage.

OUT

Error

Balance

Output

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