ADA4932-1YCPZ-R2 datasheet(18/27 Pages) AD

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Data Sheet

ADA4932-1/ADA4932-2

TERMINOLOGY

analog.com

Rev. F | 18 of 27

Figure 54. Signal and Circuit Definitions

Differential Voltage

Differential voltage refers to the difference between two node vol-

tages. For example, the output differential voltage (or equivalently,

output differential mode voltage) is defined as

VOUT, dm = (V+OUT − V−OUT)

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

−OUT terminals with respect to a common ground reference. Simi-

larly, the differential input voltage is defined as

VIN, dm = (+DIN − (−DIN))

Common-Mode Voltage

Common-mode voltage refers to the average of two node voltages

with respect to the local ground reference. The output common-

mode voltage is defined as

VOUT, cm = (V+OUT + V−OUT)/2

Balance

Output balance is a measure of how close the output differential

signals are to being equal in amplitude and opposite in phase. Out-

put balance is most easily determined by placing a well-matched

resistor divider between the differential voltage nodes and compar-

ing the magnitude of the signal at the divider midpoint with the

magnitude of the differential signal (see Figure 52). By this defini-

tion, output balance is the magnitude of the output common-mode

voltage divided by the magnitude of the output differential mode

voltage.

OutputBalanceError= ΔVOUT,cm

ΔVOUT,dm

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