PCM4204: schematic reviewer

Denny Huang

Expert 7170 points

Part Number: PCM4204
Other Parts Discussed in Thread: OPA227

Dear team

There is a good news that we design in PCM4204 in customer's new project.

Could you help to review the schematic?

Attached file is PCM4204 schematic, kindly help review and suggestion.

ADC(PCM4204)_2021-0901e.pdf

About PCM4204’s pin 51 and pin 62, could them direct connect to GND without jump ?

Note.

Part J13 is single end, analog input signal.
J44/J46/J47/J48 are NE5532DR,

It let single end input single become differential signal.

Many thanks

Denny

over 3 years ago

0 Carson Allen over 3 years ago

TI__Genius 13610 points

Hi Denny,

I will take a look at this and get back to you within 48 hours.

Best Regards,

Carson

Low Power Audio Apps

0 Carson Allen over 3 years ago

TI__Genius 13610 points

Hi Denny,

Jumper isnt necessary,

but could you explain this circuit?

Is this taking singled-ended and making differential?

Carson

0 Denny Huang over 3 years ago in reply to Carson Allen

TI__Expert 7170 points

Hi Allen

CS5368 is a differential input ADC converter,

The circuit is CS5368 reference design as below.

It take a single-end single to differential single and OP is used TI’s NE5532D.

We have verified the circuit on other project and it work fine. Kindly help check the application is workable and any parameters need to be modified?

Many thanks

Denny

0 Carson Allen over 3 years ago in reply to Denny Huang

TI__Genius 13610 points

So are you suing VCOM12 and VCOM34 ?

0 liga chen over 3 years ago in reply to Carson Allen

Prodigy 20 points

Dear Allen:

I think I don't use VCOM12 and VCOM34. Or do you have other suggestion?

Due to on the PCM4204 EVM , the VCOM12 is an output and provide bias to OPA227 V+(pin3).

But I provide the review schematic, It used NE5532DR and have bias voltage(2.5V), the net name is "VBIAS_CH12".

The "VBIAS_CH12" bias voltage connect to NE5532DR V+(pin5).

Thanks

Liga

0 Carson Allen over 3 years ago in reply to liga chen

TI__Genius 13610 points

Hello Liga,

As long as you are adding appropriate bias to the output signal using the VCOM pins arent necessary.

Best Regards,

Carson

0 liga chen over 3 years ago in reply to Carson Allen

Prodigy 20 points

Hi Allen:

I think it is more efficiency to discuss circuit.

If you can point out how to modify the schematic.

Thanks

Liga

0 Carson Allen over 3 years ago in reply to liga chen

TI__Genius 13610 points

Okay i respond through email and am closing this out

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PCM4204: schematic reviewer