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LM97937: use lm97937, The ADC test pattern function is ok; but in Normal Mode(bit bust&SNRBOOT), The data collected by ADC is always 255 or -32514.

Prodigy 180 points

Replies: 3

Views: 328

Part Number: LM97937

Dears;

        use lm97937; The ADC test pattern function is ok,Data can be read normally; but  in Normal Mode(bit bust&SNRBOOT), The data collected by ADC is always 255 or -32514.

Could you give me some advice? Thanks!

    Register configuration information & schematic diagram is as follows:

    

  • I'm assuming that this is a customer board. Are you bring-ing-up a new board? Or was this working before?
    Can you list the register writes you do to go from "test pattern" mode to "normal" mode? I see the write to register 0x70 0x21, but that puts it in test pattern mode.
    What test patterns have you tried?
    are you operating in single- or dual- lane mode?
    please share as much information as you can.

    Regards,
    satish.
  • In reply to Satish Uppathil:

    Hi satish, write to register 0x70 0x21,should be put it in Bit-Burst mode Instead of test pattern mode ?
  • In reply to yue shang:

    Correct. 0x70 0x21 should put it in bit-burst mode.

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