DRV632: DRV632

Ian Wang

Mastermind 29770 points

Part Number: DRV632

Dear Sir,

Could you pls help provide CMRR of DRV632 in 1K and 10KHz?

Thanks, Ian.

over 7 years ago

0 Ivan Salazar over 7 years ago

TI__Guru** 109745 points

Hi Ian,

You could take a look at the following:
e2e.ti.com/.../795320
e2e.ti.com/.../358789

CMRR would be around 50dB, although from the comment on the plot, a better match on resistor may improve it.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

0 kai klaas69 over 7 years ago in reply to Ivan Salazar

Guru 140200 points

Broken links?

Kai

0 Ian Wang over 7 years ago in reply to kai klaas69

TI__Mastermind 29770 points

Dear Ivan,

I am not sure what I measured is correct, please check my testing in attachment. Could you share your test diagram? I have no idea how you can produce a diagram (CMRR vs frequency).

CMRR_Test.pdf

0 Ivan Salazar over 7 years ago in reply to Ian Wang

TI__Guru** 109745 points

Hi Ian,

Your results seem to be close to the ones in the mentioned e2e post. I don't have the test setup as I was not around when they did this test. However from the capture it says dBrA, so it seems that they set the common-mode voltage as reference A in the AP and then did a frequency response in dB with respect to reference A.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

0 Ian Wang over 7 years ago in reply to Ivan Salazar

TI__Mastermind 29770 points

Dear Ivan,
We fund d/s shows CMRR result X-axis is frequency, do you have CMRR test file can send to me for share to customer?
Thanks, Ian.

0 Ivan Salazar over 7 years ago in reply to Ian Wang

TI__Guru** 109745 points

Hi Ian,

You can follow the procedure explained in the following site: www.ap.com/.../
Once you have the CMRR measurement on analog analyzer (CMTST) you just need to to a sweep were source is Gen. Freq and Data is Anlr. Ampl.
Below is a sweep I did with an EVM.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

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DRV632: DRV632