ADA4930-2YCPZ-R2 datasheet(16/28 Pages) AD

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ADA4930-1/ADA4930-2

Rev. A | Page 16 of 28

OPERATIONAL DESCRIPTION

DEFINITION OF TERMS

+IN

–IN

+OUT

–OUT

+DIN

–FB

+FB

–DIN

VOCM

VOUT, dm

RL, dm

ADA4930

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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