TAS5755M: Can I2S mic be interfaced with TAS5755M

Menaka Srinivasan

Intellectual 520 points

Part Number: TAS5755M

Hi,

I would like to interface I2S mic directly to TAS5755M and get 50W mono output. Please clarify if this is possible.

Awaiting your reply.

Thanks

over 5 years ago

0 Matthew Miao over 5 years ago

TI__Expert 6720 points

Hi Menaka,

As long as mic can provide valid format I2S to TAS5755, then the output power can be achieved as datasheet claims. (100W in Mono Mode)

Regards,

Matthew

0 Menaka Srinivasan over 5 years ago in reply to Matthew Miao

Intellectual 520 points

Hi,

Thanks for the quick response!

1. I am planning to interface ICS-43432 mic with TAS5755, Please confirm if the below pin connection is correct

MIC Pin Name - TAS5755 Pin Name

SCK ( Serial data clock ) - SCLK

WS ( Serial data word select ) - LRCLK

SD ( Serial data output ) - SDIN

2. SCK and WS pins for the I2S mic would be input and SCLK and LRCLK pins are mentioned as input in TAS5755 also. So how do I interface I2S mic directly to TAS5755 and I do not need any host processor to be used. Can you please clarify this.

3. What should be the typical input frequency for the MCLK?

Kindly clarify my above queries.

Awaiting your reply.

Thanks

0 Matthew Miao over 5 years ago in reply to Menaka Srinivasan

TI__Expert 6720 points

Hi,

If mic I2S is the standard format, and the FRAME clock is 44.1kHz or 48kHz. Then MCLK can be tied to SCLK.

It's highly suggested to use codec or SOC to be the interface. Because TAS5755 also needs I2C initialization script to set the device into play.

Regards,

Matthew

0 Menaka Srinivasan over 5 years ago in reply to Matthew Miao

Intellectual 520 points

Hi Matthew,

Thank you for your prompt reply!

Please find my below questions

Q1. Can you please confirm the pin connection mentioned in Q1 of above post ?

Q2. If SCK and WS pins for the I2S mic and SCLK and LRCLK pins of TAS5755 are all inputs, then how do I interface I2S mic directly to TAS5755.

I2S mic will require SCK and WS as input. Will TAS5755 be able to provide those signals to the I2S mic?

Q3. Is SOC interface with TAS5755 required only for I2C communication? If not, what is the SOC interface used for?

Kindly clarify the above queries along with the question number for the ease of understanding.

Awaiting your reply

Thanks,

Menaka

0 Matthew Miao over 5 years ago in reply to Menaka Srinivasan

TI__Expert 6720 points

Hi Menaka,

If your mic needs I2S input (not I2S mic output), then TAS5755 does not support direct connection with it.

Basically speaking, TAS5755 needs external I2S clock as input, and also I2S script for initialization.

So based on your situation, SOC is needed to handle the interface of mic, provide I2S and I2C to TAS5755.

Regards,

Matthew

0 Menaka Srinivasan over 5 years ago in reply to Matthew Miao

Intellectual 520 points

Hi,

Thanks for the reply!

How to adjust the gain setting of TAS5755? Is there any register to be configured or any resister strapping?

What will be the default gain value?

Awaiting your reply

Thanks

0 Matthew Miao over 5 years ago in reply to Menaka Srinivasan

TI__Expert 6720 points

Hi,

TAS5755 is one open-loop class-D device, which means default 0dBFS input signal, the output sinewave peak voltage is almost equal to PVDD value. (slightly lower than PVDD, caused by Rdson)

Besides analog gain, TAS5755 also has digital processing to provide digital gain based on different DSP processing configuration.

Regards,

Matthew

0 Menaka Srinivasan over 5 years ago in reply to Matthew Miao

Intellectual 520 points

Hi,

Thank you for the reply!

Can you please explain the difference between AD mode and BD mode. Which mode is preferred for 50W mono output?

Awaiting your reply

Thanks

0 Menaka Srinivasan over 5 years ago in reply to Menaka Srinivasan

Intellectual 520 points

Hi,

1. Can I use external oscillator for the MCLK pin? If yes, what should be the frequency?

Is it necessary to connect MCLK to SCLK?

2. Can I use two 10uF Aluminium Electrolytic Capacitors, part no - EEE-2AA100UP in parallel for PVDD. Please confirm.

Kindly clarify above queries

Awaiting your reply

Thanks

0 Matthew Miao over 5 years ago in reply to Menaka Srinivasan

TI__Expert 6720 points

Hi,

More reference materials of AD/BD: http://www.ti.com/lit/an/slaa701a/slaa701a.pdf, https://e2e.ti.com/support/archive/internal/int-audio_amplifiers/f/8/t/308552?tisearch=e2e-sitesearch&keymatch=AD%2525252525252520BD.

As mentioned, please refer TAS5755 datasheet to understand required I2S format. What's more, it's suggested to use large PVDD cap with 50W output. (TAS5755EVM Evaluation Module recommended 220uF)

Regards,

Matthew

0 Menaka Srinivasan over 5 years ago in reply to Matthew Miao

Intellectual 520 points

Hi,

Thanks for the reply!

Can you please suggest the minimum capacitance value for PVDD and what will happen if small PVDD cap id used?

Awaiting your reply

Thanks

0 Matthew Miao over 5 years ago in reply to Menaka Srinivasan

TI__Expert 6720 points

Hi,

For 50W application, it's suggested to follow TAS5755 EVM recommend (220uF cap).

Low PVDD cap might cause voltage drops while large output power.

Regards,

Matthew

0 Menaka Srinivasan over 5 years ago in reply to Matthew Miao

Intellectual 520 points

Hi,

Thanks for the reply.

Can you please confirm if I can use two 100uF cap in parallel. Will this be enough for 50W output?

Awaiting your reply

Thanks

0 Matthew Miao over 5 years ago in reply to Menaka Srinivasan

TI__Expert 6720 points

Hi,

Two parallel 100uF should be enough for your application.

Regards,

Matthew

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TAS5755M: Can I2S mic be interfaced with TAS5755M