DAC80502: Designing with DAC80502

Shibin Varghese

Part Number: DAC80502

Hello Team,
I am planning to use DAC80502DRXT in one of our designs.
The MPN controlling the same will be in 3.3V IO logic and I am planning to provide a +5V at the VDD pin of the DAC without any level shifter.
I hope there is nothing wrong with this if the pull-up is set to +3.3V since the VIH and VOH of the DAC are 1.62V only (typically it shows 0.7*VDD, now this is independent of the VDD).
I need an output voltage ranging from 0V to 5V.
I am planning to use the reference IC REF5050AID.
If I am using a 2.5V Ref voltage, can I get an output voltage of 5V?

over 2 years ago

0 Paul_Frost over 2 years ago

TI__Guru 54603 points

Hi Shibin,

Sanjay will review this and provide an answer.

Thanks,

Paul

0 Shibin Varghese over 2 years ago in reply to Paul_Frost

Intellectual 835 points

Hello Team,
Awaiting your response

0 Sanjay over 2 years ago in reply to Shibin Varghese

TI__Expert 5150 points

Hi Shibin,

1. with VDD = 5V and digital IO pull-up to 3.3V (independent of VDD) -
>> this configuration should be okay as VIH is 1.62V for DAC80502.

2. getting 0-5V with REFIO = 2.5V (external) is possible with following setting
>> BUFF-GAIN bit set to 1 and REF-DIV bit set to 0 provided VDD headroom is maintained as per data-sheet.

Thanks,

Sanjay

+1 Shibin Varghese over 2 years ago in reply to Sanjay

Intellectual 835 points

Hello Sanjay,
Thank you for your response

Data converters

Data converters forum

DAC80502: Designing with DAC80502