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

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Data Sheet

ADA4937-1/ADA4937-2

Rev. F | Page 17 of 28

TERMINOLOGY

+IN

–IN

+OUT

–OUT

+DIN

–FB

+FB

–DIN

VOCM

VOUT, dm

RL, dm

ADA4937

Figure 52. Circuit Definitions

Differential Voltage

Differential voltage 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

Common-mode voltage refers to the average of two node

voltages. The output common-mode voltage is defined as

VOUT, cm = (V+OUT + V−OUT)/2

Output Balance

Output balance is a measure of how close the differential signals

are to being equal in amplitude and opposite in phase. Output

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 midpoint of the

divider with the magnitude of the differential signal (see Figure 50).

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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