SLAS669E September 2010 – may 2020 ADS5400-SP
PRODUCTION DATA.
The 2 V voltage reference is provided internal to the ADS5400-SP. A VCM (voltage common mode) pin is provided as an output for use in dc-coupled applications, equal to the AVDD5 supply divided by 2. This provides the analog input common mode voltage to a driving circuit so that the common mode is setup properly. Some systems may prefer the use of an external voltage reference. This mode can be enabled by pulling the ENEXTREF pin high. In this mode, an external reference can be driven onto the VREF pin, which is normally expecting 2V.