Datasheet

V
IN
−
+
−
+
DV
DD
V
OCM
AV
SS
AV
DD
A
IN2
A
IN1
V
DD
V
ref
5 V
V
CC
0.1 µF
−5 V
V
CC
−
V
IN
−
+
−
+
DV
DD
V
OCM
AV
SS
AV
DD
A
IN2
A
IN1
V
DD
V
ref
5 V
V
CC
0.1 µF
THS4130
THS4131
SLOS318H –MAY 2000–REVISED MAY 2011 www.ti.com
DATA CONVERTERS
Data converters are one of the most popular applications for the fully-differential amplifiers. Figure 30 shows a
typical configuration of a fully-differential amplifier attached to a differential analog-to-digital converter (ADC).
Figure 30. Fully-Differential Amplifier Attached to a Differential ADC
Fully-differential amplifiers can operate with a single supply. V
OCM
defaults to the midrail voltage, V
CC
/2. The
differential output may be fed into a data converter. This method eliminates the use of a transformer in the circuit.
If the ADC has a reference voltage output (V
ref
), then it is recommended to connect it directly to the V
OCM
of the
amplifier using a bypass capacitor for stability. For proper operation, the input common-mode voltage to the input
terminal of the amplifier should not exceed the common-mode input voltage range.
Figure 31. Fully-Differential Amplifier Using a Single Supply
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