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DAC Channel problem.

Discussion in 'General Electronics Discussion' started by yugiraj, Jul 16, 2012.

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  1. yugiraj

    yugiraj

    5
    0
    Apr 23, 2012
    Dear Friends,
    I am facing one DAC Channel problem pls give me some solutions. I am using channel 1 to 6 in DAC board. itself I giving input Ch1 to Ch5 reading currectly. but ch6 only reading divided by 10. For EX: I fed to unit 5.000VDC input of Ch6, it will reading 0.5000V. for selction of channels i am using 2 MAX. 1st max using Ch1 to Ch4. 2nd max using Ch5 to Ch8.
    That max o/p going to op-amp, op-amp o/p going to ADC. i replaced 2nd max also same problem appeared. i compared CH5 and CH6 O/P. same only showing. where i get problem pls tell some solution.
     
  2. CocaCola

    CocaCola

    3,635
    5
    Apr 7, 2012
    Can you give us more info on the DAC board? Is it an IC based DAC (what is the chip number) or an R-2R ladder layout? Schematics of your circuit, basically any relavent info you have as right now it's a shot in the dark...
     
  3. yugiraj

    yugiraj

    5
    0
    Apr 23, 2012
    Dear sir,
    I have attached circuit file FYR. I/P going to Max IC HI549A (for selection of Channels) and MAX O/P going to ADG333A switch (for selction of I/Ps). Then switch O/P going to PGA204 op-amp ( for gain selction) it O/P going to ADC IC AD977.
     

    Attached Files:

  4. mechtronics

    mechtronics

    153
    2
    Aug 7, 2011
    A0 and A1 should select the channels you require via programming. there could be something wrong in the programming for channel 6 maybe, if u r using programming.
     
  5. yugiraj

    yugiraj

    5
    0
    Apr 23, 2012
    sir,
    If i can select CH5 means A0 & A1 values are 300mV only. tha same result is appeare in Ch6 selecting time.

    yugi.
     
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