INA821: characteristics of phase vs frequency

Ikuya Ikezoe

Prodigy 20 points

Part Number: INA821
Other Parts Discussed in Thread: INA849, , THP210

Hello.

Could you submit the characteristics of phase vs frequency?

We observed the phase delay of 45 degree in 800kHz input signal.

We want to make sure whethert it is because of less phase margin or some other reason.

Best Regards

over 1 year ago

0 Raymond Zhang1 over 1 year ago

TI__Guru 57801 points

Hi Ikuya-san,

Ikuya Ikezoe said:
Could you submit the characteristics of phase vs frequency?

Could you provide us the design requirements, the instrumentation amplifier application and the schematic? Depending on the gains of the application, INA849 may be more suitable. Please let us know what you are trying to measure.

Best,

Raymond

0 Ikuya Ikezoe over 1 year ago in reply to Raymond Zhang1

Prodigy 20 points

Hello, Raymond

Thank you for the replay.
The input signals are 1Vpp 800kHz for +IN and 0V for -IN. And the required Gain is 1.

The slew rate of INA821 is not enough for the 800kHz signal, either.
So we are sure that INA849 is suitable for our application.

We'll ask Japan TI for samples of INA849.

Thak you,

Ikuya

0 Raymond Zhang1 over 1 year ago in reply to Ikuya Ikezoe

TI__Guru 57801 points

Hi Ikuya-san,

Yes, please contact our FAE in Japan, and you will receive the product support.

You did not mention about the measurement application. You may also consider our full precision differential op amp THP210 as well.

https://www.ti.com/lit/ds/symlink/thp210.pdf?ts=1676006134723

If you need additional support, please let us know.

Best,

Raymond

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INA821: characteristics of phase vs frequency