Part Number: AFE5832LP
Hi,
We have observed an issue on certain AFE devices, where the device comes up in a bad state after power-up and initialization. The symptom is as follows:
- Data is successfully received through the LVDS interface, but the recieved samples hold constant, seemingly random, values. In some cases, only certain LVDS lines from the AFE is affected.
- The symptom is the same regardless of transmitting test-pattern or ADC data.
- The static sample values change when a TX_TRIG is issued.
As a workaround, either of these have resolved the problem:
- Extending the RESET pulse width. The required length to resolve the issue varies between devices, but it needs to be considerably longer than the 100 ns specified in the datasheet.
- Issue two RESET pulses. In this case, the width of the pulses has no importance (the issue is resolved with pulse widths well below the 100 ns requirement).
The Device Initialization procedures described in chapter 10.4 and 11.1 of the datasheet have been followed, with the possible exception of the delay between rise of DVDD_1P2 and other supplies. Can that be of relevance here?
