STA310 datasheet(26/90 Pages) STMICROELECTRONICS

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STA310

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Figure 14. PCM Output Configurations

5.2 PCM scaling

PCM scaling is needed for every decoding mode (AC3, Pro Logic, MPEG, PCM). It is applied at the end of the

filtering steps before PCM output, allowing maximum effective word width for most of the signal processing be-

fore.

Master volume (PCM_SCALE register) and balances (BAL_LR and BAL_SUR registers) are implemented for

PCM scaling.

5.3 Output quantization

For optimal results for 16/18/20-bit DACs, a quantization with rounding is applied together with the PCM scaling.

The sample value is multiplied by a rounding factor and rounded to 24 bits. The result is then left shifted (4/6/8)

for PCM output.

The output precision is selectable from the 16bits/word to 24 bits/word by configuring the field PREC in the reg-

ister PCMCONF.

5.4 Interface and output formats

The decoded audio data are output in serial PCM format.

The interface consists of the following signals

PCM_OUT0, 1, 2

PCM data, output,

SCLK

Bit clock (or serial clock), output,

LRCLK

Word clock (or Left/Right channel select clock), output,

PCMCLK

PCM clock, input or output (see <CrossRef><BlueHT>Clocks <BlueHT>on page 11 for details).

Configuration 0

Not used with Prologic

-18.5dB

Not used in

configuration 4

-8,5dB

LFE

SUB

Configuration 1

Configurations 3 and 4

Configuration 2

Not used with Prologic

LFE

SUB

-8,5dB

-18.5dB

LFE

Not used with Prologic

-16dB

LFE

-6dB

-4dB

-16dB

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