SBOS286D December 2003 – March 2022 OPA1632
The output common-mode voltage pin sets the dc output voltage of the OPA1632. A voltage applied to the VOCM pin from a low-impedance source can be used to directly set the output common-mode voltage. If the VOCM pin is left floating it defaults to the mid-rail voltage, defined as:
To minimize common-mode noise, connect a 0.1-uF bypass capacitor to the VOCM pin. Output common-mode voltage causes additional current to flow in the feedback resistor network. Since this current is supplied by the output stage of the amplifier, this creates additional power dissipation. For commonly-used feedback resistance values, this current is easily supplied by the amplifier. The additional internal power dissipation created by this current may be significant in some applications and may dictate use of the MSOP PowerPAD package to effectively control self-heating.