PCM5102A: Schematic review

Jayden Qiu

Intellectual 1405 points

Part Number: PCM5102A
Other Parts Discussed in Thread: TAD5242, TAD5212, TIDA-00223

Tool/software:

Hi Team,

This is FAE Jayden, ZTE is using PCM5102A in their auto project. Could you help support schematic review? Many Thanks.

audio_pcm5102a.pdf

Brs

Jayden

over 2 years ago

0 Arash Loloee over 2 years ago

TI__Mastermind 35821 points

Hello Jayden,

The schematic looks ok to me. I would recommend to add 22-100 Ohm series resistors to I2S signals..

Regards,

arash

0 Rubin Chen over 2 years ago in reply to Arash Loloee

Intellectual 420 points

Hi Arash,

What is the maximum current of LDOO?What is the V(min) and V(max) of LDOO?What are the ripple requirements?

Thanks

0 Arash Loloee over 2 years ago in reply to Rubin Chen

TI__Mastermind 35821 points

Hi Rubin, officially whatever is in datasheet is what we have and we share with customer. However I was able to find the following information in Galileo from 12 years ago.

Test Name	Lower Test Limit (LPL)	Upper Test Limit (UPL)	Units	Mean	Cpk (Prod)	Std dev
LDO_IDD_48K_18V	0	12.3	MA	6.058391	66.66378	0.030293
LDO_DVDD_IDD_48K_18V	0	13.8	MA	6.267403	67.53535	0.030934
LDOVLOAD	1.5	2	V	1.806853	5.668036	1.14E-02

0 Rubin Chen over 2 years ago in reply to Arash Loloee

Intellectual 420 points

Hi Arash,

We select PCM5102A at present.However，the I/O level of our SOC is 1.2V,level conversion is required.Could you please recommend DAC chip of 1.2V I/O level？Whether the chip will be developed later？

Thanks

0 Arash Loloee over 2 years ago in reply to Rubin Chen

TI__Mastermind 35821 points

Our Latest DAC family of devices such as TAD5242 or TAD5212 are highly recommended for any design!

TAD5242 High-performance pin controlled stereo audio DAC with 119dB dynamic range

TAD5212 High-performance stereo audio DAC with 119dB dynamic range

Regards,

Arash

0 Rubin Chen over 2 years ago in reply to Arash Loloee

Intellectual 420 points

Hi Lakshmi,

TAD5242 and TAD5212 have not been put into mass production yet.

Currently, 3.3 V to1.2 V can only be implemented through level conversion IC.
Can you help me evaluate whether this solution is risky?Especially the audio interface such as TDM/I2S.

Thanks

0 Jeff McPherson over 2 years ago in reply to Rubin Chen

TI__Guru 51100 points

Hi Rubin,

I am not sure that level translators are good for analog supplies. You would need to ensure that the current output is valid.

Otherwise a boost would be a better option. Also be aware that 1.8V is supported, not just 3.3V.

Best regards,
Jeff McPherson

0 Rubin Chen over 2 years ago in reply to Jeff McPherson

Intellectual 420 points

Hi Jeff，

Level switching applies only to digital signals:I2S/TDM、I2C、IO.

Is the plan of using level conversion chip risky？

Thanks

0 Arash Loloee over 2 years ago in reply to Rubin Chen

TI__Mastermind 35821 points

Hi Rubin,

We have many board with ICs that do level conversion, I don't see any issue with level conversion in general, as long as the levels are compatible with destination chip.

Regards,

Arash

0 Rubin Chen over 1 year ago in reply to Arash Loloee

Intellectual 420 points

Hi Arash，

Can PCM5102A be used to drive only one speaker?For example, if OUTL is used to drive a speaker, OUTR is not used.How to handle the unused pin of OUTR?

Thanks

0 Arash Loloee over 1 year ago in reply to Rubin Chen

TI__Mastermind 35821 points

Hi,

It is a stereo line out DAC, and from functional block diagram you see two independent paths for left and right channel. So if you don't want to use the left or right channel , it is ok. The min. load impedance is 1K, so I would connect a similar dummy load to the unused channel.

0 Rubin Chen over 1 year ago in reply to Arash Loloee

Intellectual 420 points

Hi Arash，

Please review the attached schematic diagram.
Please check whether my understanding of using only the left channel is correct. Whether the processing of OUTR is appropriate?

Thanks

8321.audio_pcm5102a.pdf

0 Arash Loloee over 1 year ago in reply to Rubin Chen

TI__Mastermind 35821 points

Yes, Correct.

For the sake of symmetry and robustness, I would add the same LP filter that you are using to unused channel too.

0 Rubin Chen over 1 year ago in reply to Arash Loloee

Intellectual 420 points

Hi Hi Arash，

Is pull-up or pull-down recommended for XSMT?

Thanks

0 Rubin Chen over 1 year ago in reply to Arash Loloee

Intellectual 420 points

Hi Arash，

Can you provide a reference design for the PCM5102A?

Thanks.

0 Arash Loloee over 1 year ago in reply to Rubin Chen

TI__Mastermind 35821 points

As it is mentioned in datasheet, Mute is active low, so you should use pull up to keep it unmuted as default.

Searching our reference design in ti.com gives you TIDA-00223.

Regards,

Arash

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PCM5102A: Schematic review