Datasheet

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SLOS310B − DECEMBER 2000 − REVISED SEPTEMBER 2006
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
differential output drive
The TLV4120 is two amplifiers arranged to produce high output current differential drive. The first amplifier, A1,
is an operational amplifier, with both inputs uncommitted. This enables the first amplifier to be configured as an
inverting amplifier, a noninverting amplifier, or even a difference amplifier. The second amplifier, A2, is internally
configured as an inverting amplifier and biased about V
DD
/2.
Bias
Control
6
5
7
V
O
+
V
DD
1
2
4
V
DD
/2
IN −
V
DD
/2
SHDN
V
O
−8
GND
3 IN+
−
+
−
+
A1
A2
R
L
V
DD
Figure 19
This approach makes a simple solution to single-ended to differential drive or even differential to differential
drive.
When using the TLV4120 to drive heavy differential loads, care must be taken not to saturate the output of the
first amplifier, as the second amplifier will produce a mirror image (about V
DD
/2) of the first amplifier’s output.
This can lead to asymmetrical differential output swings.
This differential output drive configuration is ideal for low frequency high current drive applications, such as line
drivers, driving LVDTs.