THS4532_15 Datasheet, PDF (26/58 Pages) Texas Instruments – THS4532 Ultra Low Power, Rail-to-Rail Output, Fully-Differential Amplifier

THS4532
SLOS829A – FEBRUARY 2013 – REVISED JULY 2015
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Feature Description (continued)
8.3.1.1 Setting the Output Common-Mode Voltage
The output common-model voltage is set by the voltage at the V_OCM pin and the internal circuit works to maintain
the output common-mode voltage as close as possible to this voltage. If left unconnected, the output common-
mode is set to mid-supply by internal circuitry, which may be over-driven from an external source. Figure 69 is
representative of the V_OCM input. The internal V_OCM circuit has about 24-MHz of –3-dB bandwidth, which is
required for best performance, but it is intended to be a DC bias input pin. Bypass capacitors are recommended
on this pin to reduce noise. Use Equation 2 to calculate the external current required to overdrive the internal
resistor divider.
I_EXT
=
( 2V_OCM - V_S+ +
625 kΩ
V_S- )
where
• V_OCM is the voltage applied to the V_OCM pin.
(2)
V_S+
Internal
V_OCM Circuit
625 kΩ ^IEXT
V_OCM
625 kΩ
V_S–
Figure 69. Simplified V_OCM Input Circuit
26
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