STA323W datasheet(45/77 Pages) STMICROELECTRONICS

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STA323W

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7.4.4

Post-scale link

Post-scale functionality is an attenuation placed after the volume control and directly before

the conversion to PWM. Post-scale can also be used to limit the maximum modulation index

and therefore the peak current. Setting 1, in the PSL register, causes the value stored in

Channel 1 post-scale to be used for all three internal channels.

7.4.5

Biquad coefficient link

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.

7.4.6

Dynamic range compression/anti-clipping bit

Both limiters can be used in one of two ways: anti-clipping or dynamic range compression.

When used in anti-clipping mode the limiter threshold values are constant and dependent on

the limiter settings. 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.

7.4.7

Zero-detect mute enable

Setting the ZDE bit enables the zero-detect automatic mute. When ZDE = 1, the zero-detect

circuit looks at the input data to each processing channel after the channel-mapping block. If

any channel receives 2048 consecutive zero value samples (regardless of fs) then that

individual channel is muted if this function is enabled.

Table 32.

Post-scale link

Bit

R/W

RST

Name

Description

PSL

0: each channel uses individual post-scale value

1: each channel uses channel 1 post-scale value

Table 33.

Biquad coefficient link

Bit

R/W

RST

Name

Description

4RW

BQL

0: each channel uses coefficient values

1: each channel uses channel 1 coefficient values

Table 34.

Dynamic range compression/anti-clipping bit

Bit

R/W

RST

Name

Description

5RW

DRC

0: limiters act in anti-clipping mode

1: limiters act in dynamic range compression mode

Table 35.

Zero-detect mute enable

Bit

R/W

RST

Name

Description

ZDE

Setting of 1 enables the automatic zero-detect mute

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