Datasheet

−
R
f
R
(g)
+
+
−
V
CC−
V
CC+
R
(g)
R
f
Vs
V
IN−
V
IN+
V
O+
V
O−
V
OCM
Note: For proper operation, maintain symmetry by setting
R
f
1 = R
f
2 = R
f
and R
(g)
1 = R
(g)
2 = R
(g)
⇒ A = R
f
/R
(g)
−
R
f
R
(g)
+
+
−
V
CC−
V
CC+
R
(g)
R
f
Vs
V
IN−
V
IN+
V
O+
V
O−
V
OCM
GAIN R
(g)
Ω R
f
Ω
1
2
5
10
390
374
402
402
390
750
2010
4020
RECOMMENDED RESISTOR VALUES
V
O
+
1
2
V
I
V
O
+ –
1
2
V
I
THS4130
THS4131
SLOS318H –MAY 2000–REVISED MAY 2011 www.ti.com
Figure 37 and Figure 38 depict the differences between the operation of the THS413x fully-differential amplifier in
two different modes. Fully-differential amplifiers can work with differential input or can be implemented as single
in/differential out.
Figure 37. Amplifying Differential Signals
Figure 38. Single In With Differential Out
If each output is measured independently, each output is one-half of the input signal when gain is 1. The
following equations express the transfer function for each output:
(11)
The second output is equal and opposite in sign:
(12)
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