DAC9881: gain bandwidth product of the output buffer

Pol REYMOND

Intellectual 1320 points

Part Number: DAC9881
Other Parts Discussed in Thread: INA819

Hi team,

My customer is looking at the DAC9881 to drive the REF pin of the INA819.

They would like to know if the On-Chip output buffer would be able to drive this pin.

For this, they are requesting the gain bandwidth product of the output buffer.

Could you please share this value?

Also, do you have any suggestion on their use case?

Thanks for your support.

Pol

over 5 years ago

0 Kevin Duke over 5 years ago

TI__Mastermind 46290 points

Pol,

Do you know any details around how the INA819 is being used? What are the input signals etc?

Please note with the holiday season upcoming in the US and end of the year time-bank world-wide, responses may be delayed on this topic.

0 Pol REYMOND over 5 years ago in reply to Kevin Duke

TI__Intellectual 1320 points

Hi Kevin,

Please find below the configuration of the INA819:
- INA819 power supplies : +/-15V
- Gain = 80
- Common mode voltage input : 5V
- Input signal : +/- 32mV with frequency up to 500 kHz
- Vout DAC9881 = betweem 1.5V and 3.5V

Thanks for your help.

Pol

0 Kevin Duke over 5 years ago in reply to Pol REYMOND

TI__Mastermind 46290 points

Pol,

I do not think this will be a problem, but we can double check with the design resources. Once again, though, with the holiday the reply may be delayed especially as we bring in more resources to get this closed.

0 Uttam Sahu over 5 years ago in reply to Kevin Duke

TI__Genius 14220 points

Hi Pol,

The GBW product of the internal buffer of DAC9881 is 5.5-MHz typical.

Hope that answers your question.

Regards,
Uttam Sahu
Applications Engineer, Precision DACs

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DAC9881: gain bandwidth product of the output buffer