SBAS655F September 2014 – January 2020 AMC1304L05 , AMC1304L25 , AMC1304M05 , AMC1304M25
PRODUCTION DATA.
Do not leave the inputs of the AMC1304 unconnected (floating) when the device is powered up. If both modulator inputs are left floating, the input bias current drives them to the output common-mode of the analog front end of approximately 2 V that is above the specified input common-mode range. As a result, the front gain diminishes and the modulator outputs a bitstream resembling a zero input differential voltage.