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TAS5518 group delay

Constantine Musatoff
Intellectual 880 points
Other Parts Discussed in Thread: TAS5518, TAS5614A, TAS5631, TAS5614, TAS5508C, TAS5518C

State:

TAS5518 & TAS5614A at 192 or 176.4 kHz. All biquads switched off. DRC switchted off. Louness switched off. Only amplification control is used.

I want to use electro acoustic feed back on bass section.

Question:

What maximum group delay I can expect from amplifier in microseconds or samples?

  • 0
    TI__Guru**** 189399 points

    Hi, Constantine,

    Without any processing incurring delays in the TAS5518, the internal DAP has a 1 FS latency and the noise shaper, etc has a 3 to 4 FS latency.

    The total latency is 4 to 5 times the sample frequency thru the 5518.

    The TAS5614 has some delay also. It is very similar to the delay in the TAS5631 discussed in this thread:

    http://e2e.ti.com/support/amplifiers/audio_amplifiers/f/6/p/115870/411175.aspx#411175

    -d2

     

  • 0 in reply to Don Dapkus
    Intellectual 880 points

    Hi, Don!

    Thanks for this information. It is very good, that delay is not large. 

     

    One more question. TAS5518 has no individual by channel volume control on some channels in 175/192 mode. Is it good method to use mixing coefficients instead of individual volume control? I have no need to tune individual volume control at any times in my project. 

    Is it better to use TAS5508C instead of 5518?

  • 0 in reply to Constantine Musatoff
    TI__Guru**** 189399 points

    Hi, Constantine,

    I'm not sure I understand your questions.

    Table 2-2 says there is 1 master and 8 individual volume controls when operated in 176.4 and 192 kHz modes.

    Do you mean TAS5518C versus TAS5518? If so, yes, definitely, the C version is the latest and greatest. 

    If you mean TAS5508C versus TAS5518C, I am actually not sure of the differences between those two parts. Let me know if that's your question, and I'll look into it for you.

    -d2

  • 0 in reply to Don Dapkus
    Intellectual 880 points

    Oh, yes, Don!

     

    I has only TAS5518 datasheet and I think that TAS5518C has the same functions. But TAS5518C has individual volume controls in 176/192 mode when TAS5518 hasn't it (Figure 1-5)

     

    What the difference between TAS5518C and TAS5508C? I don't need in any service functions such bequads, buss and treble control, loudness and DRC. In datasheets, 5518C has 110dB dynamic range, but 5508C has 102dB - Why? The number formats and math processing are the same.

     

    Thanks for answer