STA382BW datasheet(115/172 Pages) STMICROELECTRONICS

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STA382BW

Doc ID 022783 Rev 1

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7.5.1

Noise-shaper bandwidth selection

7.5.2

AM mode enable

The STA382BW features an FFX processing mode that minimizes the amount of noise

generated in the frequency range of AM radio. This mode is intended for use when FFX is

operating in a device with an active AM tuner. The SNR of the FFX processing is reduced to

approximately 83 dB in this mode, which is still greater than the SNR of AM radio.

7.5.3

PWM speed mode

7.5.4

Zero-crossing enable

The ZCE bit enables zero-crossing adjustment. When volume is adjusted on digital zero-

crossing, no clicks are audible.

7.5.5

Soft volume update enable

Table 120.

Noise-shaper bandwidth selection

Bit

R/W

RST

Name

Description

R/W

NSBW

1: Third order NS

0: Fourth order NS

Table 121.

AM mode enable

Bit

R/W

RST

Name

Description

3R/W

AME

0: Normal FFX operation

1: AM reduction mode FFX operation

Table 122.

PWM speed mode

Bit

R/W

RST

Name

Description

4R/W

PWMS

0: Normal speed (384 kHz) all channels

1: Odd speed (341.3 kHz) all channels. Not suitable for

binary BTL mode.

Table 123.

Zero-crossing enable

Bit

R/W

RST

Name

Description

6R/W

ZCE

‘1’: Volume adjustments only occur at digital zero-crossing

‘0’: Volume adjustments occur immediately

Table 124.

Soft volume update enable

Bit

R/W

RST

Name

Description

7R/W

SVE

1: Volume adjustments ramp according to SVR settings

0: Volume adjustments occur immediately

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