DAC121S101: Output state at and after power on reset.

Raul Carrillo

Part Number: DAC121S101
Other Parts Discussed in Thread: DAC63001, DAC63204

Hello,

I am working to use in my design the DAC121S101 and I would like to use to control an LDO, like in design described in SBAA341A. Datasheet says that 3 power Down modes can be configured, 1K and 100K pull down and high impedance. My question is if any of them is set during and after power on before a valid write sequence in the DAC.

Regards and thanks in advance

Raúl

over 1 year ago

+1 Katlynne Jones over 1 year ago

TI__Mastermind 33348 points

Hi Raúl,

Figure 31 in the datasheet shows the output response during the power on reset. After the power on reset the DAC data register is "filled with zeros" meaning that the output is powered up, just set to zero code (0V).

Best,

Katlynne Jones

0 Katlynne Jones over 1 year ago in reply to Katlynne Jones

TI__Mastermind 33348 points

Hi Raúl,

Follow-up DAC63204, or DAC63001 if you require single channel, are our recommended devices for this application. They power up in Hi-Z by default and even have a hi-z output when the supplies are powered off.

Best,

Katlynne Jones

0 Raul Carrillo over 1 year ago in reply to Katlynne Jones

Prodigy 50 points

Hi Katlynne,

Thank you for your reply, the DAC121S101 can't be replaced, but knowing the power up status i can foreseen the LDO in shutdown until DAC is configured.

Raúl

0 Katlynne Jones over 1 year ago in reply to Raul Carrillo

TI__Mastermind 33348 points

Hi Raúl,

Got it. Please reach out if you have any other questions.

Best,

Katlynne Jones

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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DAC121S101: Output state at and after power on reset.