STA381BWS datasheet(114/171 Pages) STMICROELECTRONICS

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STA381BWS

114/171

Doc ID 018937 Rev 6

7.5.1

Noise-shaper bandwidth selection

7.5.2

AM mode enable

The STA381BWS 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 119.

Noise-shaper bandwidth selection

Bit

R/W

RST

Name

Description

R/W

NSBW

1: Third order NS

0: Fourth order NS

Table 120.

AM mode enable

Bit

R/W

RST

Name

Description

3R/W

AME

0: Normal FFX operation

1: AM reduction mode FFX operation

Table 121.

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 122.

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 123.

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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