STA3398 datasheet(37/77 Pages) STMICROELECTRONICS

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STA339BW

Doc ID 15251 Rev 5

37/77

6.5.4

AM mode enable

STA339BW features aFFX processing mode that minimizes the amount of noise generated

in frequency range of AM radio. This mode is intended for use when FFX is operating in a

device with an AM tuner active. 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.

6.5.5

PWM speed mode

6.5.6

Distortion compensation variable enable

6.5.7

Zero-crossing volume enable

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

zero-crossings no clicks are audible.

6.5.8

Soft volume update enable

Table 39.

AM mode enable

Bit

R/W

RST

Name

Description

3R/W

AME

0: Normal FFX operation.

1: AM reduction mode FFX operation

Table 40.

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 41.

Distortion compensation variable enable

Bit

R/W

RST

Name

Description

R/W

DCCV

0: Use preset DC coefficient

1: Use DCC coefficient

Table 42.

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

Table 43.

Soft volume update enable

Bit

R/W

RST

Name

Description

R/W

SVE

1: Volume adjustments ramp according to SVR settings

0: Volume adjustments occur immediately

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