ADA4950-2YCPZ-R7 datasheet(17/26 Pages) AD

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Data Sheet

ADA4950-1/ADA4950-2

Rev. B | Page 17 of 26

TERMINOLOGY

+IN

–IN

+OUT

–OUT

+INA

+INB

–INB

–INA

VOCM

RGA

500Ω

VOUT, dm

RL, dm

ADA4950-x

RGB

250Ω

RGB

250Ω

500Ω

RGA

500Ω

Figure 52. Signal and Circuit Definitions

Differential Voltage

Differential voltage refers to the difference between two node

voltages. For example, the output differential voltage (or equiv-

alently, output differential node 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 output terminals with respect to a common ground

reference.

The input differential voltage is defined in different ways,

depending upon the selected gain.

For G = 1

VIN, dm = (+INA − (−INA))

where +INA and −INA refer to the voltages at the +INA and

−INA input terminals with respect to a common ground

reference (input terminals +INB and −INB are floating).

For G = 2

VIN, dm = (+INB − (−INB))

where +INB and −INB refer to the voltages at the +INB and

−INB input terminals with respect to a common ground

reference (input terminals +INA and −INA are floating).

For G = 3, input terminals +INA and +INB are connected

together, and input terminals −INA and −INB are connected

together.

VIN, dm = (+INAB − (−INAB))

where +INAB and −INAB refer to the voltages at the connection

of input terminals +INA and +INB and at the connection of

input terminals −INA and −INB with respect to a common

ground reference.

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

Output Balance

Output balance is a measure of how close the output differential

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

Any imbalances in amplitude or phase produce an undesired

common-mode signal at the amplifier output. Output balance

error is defined as 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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