STA3818WTR View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
STA3818WTR Datasheet PDF : 174 Pages
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STA381BW
Register description: Sound Terminal compatibility
7.5.1
Noise-shaper bandwidth selection
Table 119. Noise-shaper bandwidth selection
Bit R/W RST
Name
Description
2 R/W 0
NSBW
1: Third order NS
0: Fourth order NS
7.5.2
AM mode enable
Bit R/W RST
3 R/W 0
Table 120. AM mode enable
Name
Description
AME
0: Normal FFX operation
1: AM reduction mode FFX operation
7.5.3
The STA381BW 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.
PWM speed mode
Bit R/W RST
4 R/W 0
Table 121. PWM speed mode
Name
Description
PWMS
0: Normal speed (384 kHz) all channels
1: Odd speed (341.3 kHz) all channels. Not suitable for
binary BTL mode.
7.5.4
Zero-crossing enable
Bit R/W RST
6 R/W 0
Table 122. Zero-crossing enable
Name
Description
ZCE
1: Volume adjustments only occur at digital zero-crossing
0: Volume adjustments occur immediately
7.5.5
The ZCE bit enables zero-crossing adjustment. When volume is adjusted on digital zero-
crossing, no clicks are audible.
Soft volume update enable
Bit R/W RST
7 R/W 1
Table 123. Soft volume update enable
Name
Description
SVE
1: Volume adjustments ramp according to SVR settings
0: Volume adjustments occur immediately
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