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Difference of headroom between TAS5538 and TAS5558?

Other Parts Discussed in Thread: TAS5538, TAS5558

Dear All,

I have a question.

My customer was comparing the data sheet of TAS5538 the TAS5558.
So there was no part of the described in the TAS5558.
The contents following description.

Data Manual Page36

• The samples input into the DRC are 32-bit words and consist of the upper 32 bits of the 48-bit word
format used by the digital audio processor (DAP). The 48-bit DAP word is derived from the 32-bit serial
data received at the serial-audio receive port by adding 8 bits of headroom above the 32-bit word and
8 bits of computational precision below the 32-bit word. If the audio-processing steps between the SAP
input and the DRC input result in no accumulative boost or cut, the DRC operates on the 8 bits of
headroom and the 24 MSBs of the audio sample. Under these conditions, a 0-dB (maximum value)
audio sample (0x7FFF FFFF) is seen at the DRC input as a –48-dB sample (8 bits × –6 dB/bit = –48
dB).

Headroom of TAS5538 According to this it has been described as a 48dB but there is no information in the TAS5558.
I've confirmed it is assumed that the 24dB in the data sheet and PPConsole.

Please tell us about this difference.

Best Regards,

Y.Hasebe