AnsweredAssumed Answered

ADV7343 color sub career frequency

Question asked by daisu on Jun 18, 2014
Latest reply on Jul 15, 2014 by daisu

Hello,

 

1 issue
  Color sub career frequency of ADV7343 output is sometimes differed from standard frequency ,3579545Hz±10Hz.
  (more than 700Hz)
  In this case, monochrome image is displayed at monitor.
2 connection

  ADV7343 is connected to VRIF(VideoPortInterFace) pin of DSP_ tms320dm6467t by TI
3 condition
  Operation of VRIF is unstable under start up sequence of  tms320dm6467t.
   1: Power on
   2: Datastream to VRIF
   3: Data of VRIF is disappeared.
   4: Data stream to VRIF and start standard operation.

 

  Time between above 3 and 4

  If above time is less than 1 second, frequency of color sub career is differed more than 700Hz from standard frequency.
  If  above time is about 10 second,  frequency of color sub career is differed from 200Hz but, color image is displayed at monitor.

 

Question
  We do not know why frequency of color sub career is differed about 700Hz,
  Please let me know how to be stable.

 

Regards,

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