AD8131ARMZ datasheet(15/20 Pages) AD

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AD8131

Rev. B | Page 15 of 20

OPERATIONAL DESCRIPTION

AD8131

RL, dm VOUT, dm

–OUT

+OUT

–OUT

+OUT

+IN

–IN

+DIN

–DIN

VOCM

Figure 39. Circuit Definitions

Differential voltage refers to the difference between two node

voltages. For example, the output differential voltage (or

equivalently output differential-mode voltage) shown in

Figure 39 is defined as

(

)

OUT

−

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

terminals with respect to a common reference.

Common-mode voltage refers to the average of two node

voltages. The output common-mode voltage is defined as

(

) 2

OUT

−

Balance is a measure of how well differential signals are

matched in amplitude and exactly 180 degrees apart in phase.

Balance is most easily determined by placing a well-matched

resistor divider between the differential voltage nodes and

comparing the magnitude of the signal at the divider’s midpoint

with the magnitude of the differential signal. By this definition,

output balance is the magnitude of the output common-mode

voltage divided by the magnitude of the output differential-

mode voltage.

OUT

Error

Balance

Output

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