AD8131ARMZ-REEL View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD8131ARMZ-REEL

Low Cost, High Speed Differential Driver

Analog Devices 

OPERATIONAL DESCRIPTION

RF

+DIN

VOCM

–DIN

RG

+IN

–OUT

–OUT

AD8131

RL, dm VOUT, dm

RG

–IN

+OUT

RF

+OUT

Figure 39. Circuit Definitions

Differential voltage refers to the difference between two node

voltages. For example, the output differential voltage (or

equivalently output differential-mode voltage) shown in

Figure 39 is defined as

( ) VOUT,dm = V+OUT − V−OUT

V+OUT and V–OUT refer to the voltages at the +OUT and −OUT

terminals with respect to a common reference.

AD8131

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 is a measure of how well differential signals are

matched in amplitude and exactly 180 degrees apart in phase.

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’s 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.

Output Balance Error = VOUT, cm

VOUT , dm

Rev. B | Page 15 of 20

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