ADA4937-1YCPZ-R7 datasheet(17/28 Pages) AD

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ADA4937-1

Rev. 0 | Page 17 of 28

OPERATIONAL DESCRIPTION

DEFINITION OF TERMS

ADA4937-1

+IN

–IN

+OUT

–OUT

+DIN

–FB

+FB

–DIN

VOCM

VOUT, dm

RL, dm

Figure 46. Circuit Definitions

Differential Voltage

This refers to the difference between two node voltages. 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 reference.

Common-Mode Voltage

This refers to the average of two node voltages. The output

common-mode voltage is defined as

VOUT, cm = (V+OUT + V−OUT)/2

Balance

Balance is a measure of how well differential signals are

matched in amplitude and are exactly 180° 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 (see Figure 44). 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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