ADA4939-2YCPZ-R7 datasheet(16/24 Pages) AD

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ADA4939-1/ADA4939-2

Data Sheet

Rev. A | Page 16 of 24

OPERATIONAL DESCRIPTION

DEFINITION OF TERMS

+IN

–IN

+OUT

–OUT

+DIN

–FB

+FB

–DIN

VOCM

VOUT, dm

RL, dm

ADA4939-1/

ADA4939-2

Figure 42. 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

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 divider midpoint

with the magnitude of the differential signal (see Figure 39). 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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