Output Status of DAC904 during power down.

Matt, Thank you very much for your reply.
High impedance is fine for our current circuit.
I have another question. During power-down(PD=L), Can we write in input date at DAC for after power up ?
We need some particular output just after a power-up(PD=H).
I think that this PD function is just power-down, and data of latch is hold, because it is not clear function.
Is my recognition wrong?

Best Regards, Uchino

Hi Uchino,

Unfortunately I can't give you a definite answer, but what I interpret from the datasheet is that the digital logic is still functional during power down. If you take a look at the power supply section of the electrical table, you'll see that there is only a power-down current listed for the analog supply. Further, if you look at the typical power consumption in power down mode (45 mW), this is nearly equivalent to the running digital supply consumption plus the power-down analog consumption: 8*5+1.1*5 = 45.5 mW. I suspect that the ~22 mA savings on the analog supply is from the output current sources being powered down.

This leads me to believe that you can hold the device in power down and preload the latches with the appropriate data before powering up. The other option would be to be able to power down a device further down the chain, such as an amplifier if it has a power down pin.

Regards,
Matt Guibord

Matt, Your prompt reply to the above request will be highly appreciated.
I think that your interpretation are make sense for me.
I agree to your interpretation, too.
We try it if we obtain sample.

Best Regards, Uchino