DAC8555: Reverse current to VOUT pin

Kei Kuwahara

Expert 7660 points

Part Number: DAC8555

Hello team,

Would it be okay to flow reverse current to VOUT of this device?
Will it damage the device?

My customer is trying to build system like below with opamp operating at 15V, while DAC8555 is at 3.3V.

Best Regards,
Kei Kuwahara

over 1 year ago

+1 Erin Bowrie over 1 year ago

TI__Genius 10440 points

Hi Kei,

This device does have sink current capability, but it offsets the output voltage quite a bit. I would suggest limiting the current into the DAC to account for this. As long as you do not go over the 10mA mark in the plot, the device should not be damaged.

Thanks,
Erin

0 Kei Kuwahara over 1 year ago in reply to Erin Bowrie

TI__Expert 7660 points

Hello Erin-san,

Thank you for your answer.

My customer wants to know the input impedance of VOUT pin when the device is OFF (VDD = 0V).

Do you have the impedance value for VOUT when VDD = 0V?

Best Regards,
Kei Kuwahara

0 Erin Bowrie over 1 year ago in reply to Kei Kuwahara

TI__Genius 10440 points

Hi Kei,

It does not look like we have an impedance value when the device is off. The device likely uses the Power Down circuitry when the device is off, though the datasheet doesn't say what the value is besides that it is high impedance.

Thanks,
Erin

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DAC8555: Reverse current to VOUT pin