sta339bw STMicroelectronics, sta339bw Datasheet - Page 37

• Manufacturer Part Number: sta339bw
• Description: 2.1-channel High-efficiency Digital Audio System
• Manufacturer: STMicroelectronics

STA339BW
6.5.4
6.5.5
6.5.6
6.5.7
6.5.8
AM mode enable
Table 39.
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.
PWM speed mode
Table 40.
Distortion compensation variable enable
Table 41.
Zero-crossing volume enable
Table 42.
The ZCE bit enables zero-crossing volume adjustments. When volume is adjusted on digital
zero-crossings no clicks are audible.
Soft volume update enable
Table 43.
3
4
5
6
7
Bit
Bit
Bit
Bit
Bit
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
AM mode enable
PWM speed mode
Distortion compensation variable enable
Zero-crossing volume enable
Soft volume update enable
0
0
0
1
1
RST
RST
RST
RST
RST
AME
PWMS
DCCV
ZCE
SVE
Name
Name
Name
Name
Name
Doc ID 15251 Rev 4
0: Normal FFX operation.
1: AM reduction mode FFX operation
0: Normal speed (384 kHz) all channels
1: Odd speed (341.3 kHz) all channels
0: Use preset DC coefficient
1: Use DCC coefficient
1: Volume adjustments only occur at digital zero-
crossings
0: Volume adjustments occur immediately
1: Volume adjustments ramp according to SVR settings
0: Volume adjustments occur immediately
Description
Description
Description
Description
Description
Register description
37/77