TAS6424L-Q1: Group delay of OSR

Kazuto Tatsumi

Part Number: TAS6424L-Q1
Other Parts Discussed in Thread: TAS6424-Q1

Hello,

The datasheet shows SDM_OSR can be programmable by Reg.0x02. How much is the group delay of digital filter on OSR processing?

Regards,
Kazuto

over 2 years ago

0 Gregg Scott over 2 years ago

TI__Mastermind 34235 points

Hi Kazuto-san,

I will request this data and get back to you.

0 Gregg Scott over 2 years ago

TI__Mastermind 34235 points

Kazuto-san,

Are you trying to determine the latency by changing the OSR from 64 to 128? If we know the reason for the data, we can provide an accurate answer.

0 Kazuto Tatsumi over 2 years ago in reply to Gregg Scott

TI__Intellectual 2820 points

Hi Gregg,

It should be TAS6424-Q1. If the characteristic is different from L, please close this thread then I'll post it with TAS6424-Q1 again. Sorry for my mistake.

For the question, I wanted to know "group delay" which means the group delay plot per frequency after the OSR process, not a latency between OSR 64 and 128.

Regards,
Kazuto

0 Gregg Scott over 2 years ago in reply to Kazuto Tatsumi

TI__Mastermind 34235 points

Kazuto,

I will need to measure it on an EVM. This is not part of our validation process or datasheet specification. It will be performed for the whole system, including the output filters.

+1 Gregg Scott over 2 years ago in reply to Kazuto Tatsumi

TI__Mastermind 34235 points

Kazuto,

The group delay is constant from 20Hz to 20kHz on our device. With OSR = 64, the group delay is 25us. And with OSR = 128, the group delay is 35us.

0 Kazuto Tatsumi over 2 years ago in reply to Gregg Scott

TI__Intellectual 2820 points

Hi Gregg, well noted. Thank you for taking a data on an EVM!

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TAS6424L-Q1: Group delay of OSR