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AD7671 Output has step

Hi,

 When I use AD7671 to convert signal (1Hz to 1kHz), I found steps in the output.

Attachment figure 1 is the waveform, where green line is input of AD7671;yellow line is the output of AD7671 (a DCA output, the DAC operated well).

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  • Hi Jonathan,

    I found when I chang the input driver of ADC(AD7671) the steps will be different. When I use AD797 as the driver the output is in Figure 1. When I remove AD797 and drive the input directly from the generator the output is in Figure2.

    I did not use AD8021 which is recommand in ADC's datasheet. I'm afraid the problem is the input driver. What's your opinion?

    Many thanks

    BR

    Henry ZHANG

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  • Hi Jonathan,

    I found when I chang the input driver of ADC(AD7671) the steps will be different. When I use AD797 as the driver the output is in Figure 1. When I remove AD797 and drive the input directly from the generator the output is in Figure2.

    I did not use AD8021 which is recommand in ADC's datasheet. I'm afraid the problem is the input driver. What's your opinion?

    Many thanks

    BR

    Henry ZHANG

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