If I interpret the TI UCD92xx errata correctly the maximum slew rate for a specific rail on an UCD9240 would be given by:
- Maximum EADC Slew-rate of 0.156V/ms.
- AFE gain setting
- EAp/EAn divider
- Rail voltage
That is, if I have a 1.8V rail that uses a divider of 2/3 (resulting in a control voltage of 1.2V), and an AFE gain of 4x.
- The maximum slew rate for this rail would be given by: 156mV/ms / 4 * 3/2 = 58.5mV/ms
- The minimum rise time for this rail would be given by: 1200mV / 156mV/ms * 4 = 30.8ms
Is this interpretation correct?
What are the consequences of violating these conditions?