AD7982 datasheet(16/24 Pages) AD

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AD8475

Rev. B | Page 16 of 24

TERMINOLOGY

+IN

VOCM

–IN

+OUT

–OUT

VOUT, dm

RL, dm

AD8475

1kΩ

1.25kΩ

1kΩ

Figure 48. Signal and 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 ground reference.

Similarly, the differential input voltage is defined as

VIN, dm = (V+IN − (V−IN))

Common-Mode Voltage

Common-mode voltage refers to the average of two node voltages

with respect to the local ground reference. 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 output 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. 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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