ADS7138: AVDD supply for ADS7138 and INA2191A1 using 4.096 reference

deepak naiknavare

Part Number: ADS7138
Other Parts Discussed in Thread: INA2191

Tool/software:

Hi,

i am using (LT1790 max 5mA) for 4.096 reference of ADS7138. Since i also had INA2191 suitable for this line, i have added it on 4.096 reference.

I am little concerned if ADS7138 and INA2191A1 combined can load LT1790 eventhough datasheet electrical data says less than 1mA together.

Do you think the attached circuit is fine?

for digital lines i have used 3v3 supply as both AVDD and DVDD are independent.

5 months ago

0 Joel Meraz 5 months ago

TI__Genius 17670 points

Hi Deepak,

Apologies for the late response on this.

From the perspective of the ADC, it should be the least concern. As at a maximum, it will draw less than 300uA . The current from the amplifier is a little bit more unknown to me.

I'll transfer the thread over to the amplifiers team to provide a little bit more detail on the max current you might expect. What exactly is the output circuit that the amplifier is driving, and what is the maximum output voltage swing you would expect?

Regards,
Joel

0 Guang Zhou 5 months ago in reply to Joel Meraz

TI__Mastermind 35290 points

Hi,

From the perspective of INA2191, it is OK too.

Regards

Guang

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ADS7138: AVDD supply for ADS7138 and INA2191A1 using 4.096 reference