AD7656 vs. ADS8556

I see that ADI's AD7656YSTZ converter is functional and pin compatible to TI's ADS8556IPM.

I already have a design based on ADS8556. Are there any specific precautions to take in order to replace the TI part with AD7656?

Please advise,

T

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    •  Analog Employees 
    on Feb 4, 2013 4:42 PM

    Hi, T.

    When designing the AD7656 please follow the decoupling requirements as outlined in the datasheet. We also have the AD7656-1 which is pin compatible to the AD7656 but has a reduced decoupling requirement compared to the AD7656. Please check figure 28 on page 22 of the AD7656-1 datasheet for the typical connection diagram. Here are other considerations in operating the part:

    1. In all modes, the parts should receive a RESET pulse after power-up.
    2. If the CONVST pin is held low during the RESET pulse, then after the RESET pulse, the AD7656-1 needs to receive a complete CONVST pulse to initiate the first conversion.

    Regards,

    Karen

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  • 0
    •  Analog Employees 
    on Feb 4, 2013 4:42 PM

    Hi, T.

    When designing the AD7656 please follow the decoupling requirements as outlined in the datasheet. We also have the AD7656-1 which is pin compatible to the AD7656 but has a reduced decoupling requirement compared to the AD7656. Please check figure 28 on page 22 of the AD7656-1 datasheet for the typical connection diagram. Here are other considerations in operating the part:

    1. In all modes, the parts should receive a RESET pulse after power-up.
    2. If the CONVST pin is held low during the RESET pulse, then after the RESET pulse, the AD7656-1 needs to receive a complete CONVST pulse to initiate the first conversion.

    Regards,

    Karen

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