ad8476armz-rl Analog Devices, Inc., ad8476armz-rl Datasheet - Page 15

• Manufacturer Part Number: ad8476armz-rl
• Description: Low Power, Unity Gain, Fully Differential Amplifier And Adc Driver
• Manufacturer: Analog Devices, Inc.

Data Sheet
TERMINOLOGY
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
where V
−OUT terminals with respect to a common ground reference.
Similarly, the differential input voltage is defined as
V
V
VOCM
OUT, dm
IN, dm
+IN
–IN
+OUT
= (V
= (V
and V
10kΩ
10kΩ
Figure 48. Signal and Circuit Definitions
+IN
+OUT
− V
−OUT
− V
−IN
refer to the voltages at the +OUT and
)
AD8476
−OUT
)
10kΩ
10kΩ
–OUT
+OUT
R
L, dm
V
OUT, dm
Rev. A | Page 15 of 20
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
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.
V
Output
OUT, cm
= (V
Balance
+OUT
+ V
Error
−OUT
=
)/2
∆
∆
V
V
OUT
OUT
,
,
dm
cm
AD8476