STA369BW datasheet(43/88 Pages) STMICROELECTRONICS

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STA369BW

Doc ID 022033 Rev 1

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7.5.3

Noise-shaper bandwidth selection

7.5.4

AM mode enable

The STA369BW 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.

7.5.5

PWM speed mode

7.5.6

Distortion compensation variable enable

7.5.7

Zero-crossing volume enable

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

zero-crossings, no clicks are audible.

Table 37.

Noise-shaper bandwidth selection

Bit

R/W

RST

Name

Description

R/W

NSBW

1: Third order NS

0: Fourth order NS

Table 38.

AM mode enable

Bit

R/W

RST

Name

Description

3R/W

AME

0: Normal FFX operation.

1: AM reduction mode FFX operation

Table 39.

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

Table 40.

Distortion compensation variable enable

Bit

R/W

RST

Name

Description

5R/W

DCCV

0: Use preset DC coefficient

1: Use DCC coefficient

Table 41.

Zero-crossing volume enable

Bit

R/W

RST

Name

Description

6R/W

ZCE

1: Volume adjustments only occur at digital zero-crossings

0: Volume adjustments occur immediately

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