STA309B datasheet(29/66 Pages) STMICROELECTRONICS

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STA309B

Registers

Doc ID 022570 Rev 2

29/66

In dynamic range compression mode the limiter threshold values vary with the volume

settings allowing a nighttime listening mode that provides a reduction in the dynamic range

regardless of the volume level.

By setting this bit to one, de-emphasis will be implemented on all channels. When this is

used, it takes the place of biquad #7 in each channel and any coefficients using biquad #1

will be ignored. The DSPB (DSP bypass) bit must be set to 0 for de-emphasis to function.

Post-Scale functionality can be used for power-supply error correction. For multichannel

applications running off the same power supply, the post-scale values can be linked to the

value of channel 1 for ease of use and in order to update the values faster.

For ease of use, all channels can use the biquad coefficients loaded into the channel 1

coefficient RAM space by setting the BQL bit to 1. Therefore, any EQ updates only have to

be performed once.

Bit

RST

Name

Description

2RW

DEMP

De-emphasis:

0: no de-emphasis

1: de-emphasis

Bit

RST

Name

Description

PSL

Post-scale link:

0: each channel uses individual post-scale value

1: each channel uses channel 1 post-scale value

Bit

RST

Name

Description

4RW

BQL

Biquad link:

0: each channel uses coefficient values

1: each channel uses channel 1 coefficient values

Bit

RST

Name

Description

7:5

PWMS[2:0]

PWM speed selection:

PWMS[1:0]

PWM output speed

000

Normal speed (384 kHz) (all channels)

001

Half-speed (192 kHz) (all channels)

010

Double-speed (768 kHz) (all channels)

011

Normal speed (channels 1-6), double-speed (channels 7-8)

100

Odd speed (341.3 kHz) (all channels)

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