tas5825m: DC coupled outputs and overall latency

Darren Jenkins

Part Number: TAS5825M

Audio amplifier team,

Do we have a reference design for the TAS5825M that shows it used with DC coupled output? ie. no High Pass filter in the signal path. Is this an acceptable way to use this device?

What is the spec for latency through this device from input to output? If it's a range, depending on configuration, can you provide these details?

Thanks,

Darren

over 6 years ago

0 Andy Liu (BMS) over 6 years ago

TI__Guru 52115 points

Hi Darren,

As far as I know, a DC blocking block exists in each TAS5825M flow, which removes DC from incoming audio data. I don't see there is a way to bypass or disable this block for now.

Regarding the latency, we will measure it and then get back to you.

Andy

Andy

0 Darren Jenkins over 6 years ago in reply to Andy Liu (BMS)

TI__Genius 10526 points

Thanks Andy.

And if you can also share the doc: SLAA786, that would be great. The link to it in the datasheet is broken.

Darren

0 Andy Liu (BMS) over 6 years ago in reply to Darren Jenkins

TI__Guru 52115 points

Hi Darren,

My TIS is still working on it. I will try to make it available as soon as possible.

Andy

0 Alix Wan over 6 years ago

TI__Genius 9995 points

Hi Darren,

As there is no offical latency from input to output, I did some tests for your reference:

Configuration: bypass the DSP flow, set input sampling rate to 48KHz, PSIA input: 1KHz sin

The latency is about 348us (~18 Ts), which does not include ramp up process.

In general, the latency depends on the configuration and it is about (17~18 )*Ts (Ts is the input sampling period). Hence, increasing samping rate will reduce the latency.

0 Shawn Zheng over 6 years ago in reply to Alix Wan

TI__Mastermind 24835 points

Hi Darren,
Could you please help to close this question if it's anwered? Thank you!

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tas5825m: DC coupled outputs and overall latency