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AMC7812 AD conversion problem ?

Kiyoung SON
Intellectual 515 points

Dear TI-er.

· End-application : Semiconductor ATE
· Detailed problem description : The EVM is operated with regular noise.
· What is your input signal : No input (CH0 & CH1)
· Supply voltages : 24Voltage to EVM
· Reference voltage : internal reference
· Input and reference drive circuits : EVM

What is the noise ?

Has the noise a bad effect on AD conversion ?

Plz help me.

  • 0
    TI__Guru 53983 points

    Kiyoung SON,

    The DAC8712 ADC input channels should be considered as high impedance input, so a input signal should be applied for you to see valid data.  Without a input signal the pins are floating, with the only "signal" being created by parasitic charges on the pins.  A good test would be to use some kinds of bench-top supply or even the output of 2 DAC channels as the input for the ADCs.

    Let me know if you have any questions.

    Paul