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AD7609 Partial Power-Down?

Hello,

Is the AD7609 designed to withstand active analog input voltages (of up to +/-16V) while the device itself is powered-down?

I'm not sure about the internal clamping circuit. Is this an active circuit that needs a proper power supply to work as intended?

Thank you.

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  • Hi, 

    The protection should work in normal or power-down mode. However, when device is powered-down I think it is recommended to tie both inputs to GND. The overvoltage clamp is use for transient overvoltage condition and not recommended to be active for extended periods in either mode (normal or power-down) as stressing the part outside range may degrade the Bipolar Zero Code error and THD performance as stated in the datasheet. 

    Thanks,

    Jellenie

Reply
  • Hi, 

    The protection should work in normal or power-down mode. However, when device is powered-down I think it is recommended to tie both inputs to GND. The overvoltage clamp is use for transient overvoltage condition and not recommended to be active for extended periods in either mode (normal or power-down) as stressing the part outside range may degrade the Bipolar Zero Code error and THD performance as stated in the datasheet. 

    Thanks,

    Jellenie

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