STA326
7.6.4 AM Mode Enable
BIT
R/W
RST
NAME
DESCRIPTION
3
R/W
0
AME
AM Mode Enable:
0 – Normal DDX® operation.
1 – AM reduction mode DDX® operation.
The STA326 features a DDX® processing mode that minimizes the amount of noise generated in the fre-
quency range of AM radio. This mode is intended for use when DDX® is operating in a device with an
active AM tuner. The SNR of the DDX® processing is reduced to ~83dB in this mode, which is still greater
than the SNR of AM radio.
7.6.5 PWM Speed Mode
BIT
R/W
RST
NAME
DESCRIPTION
4
R/W
0
PWMS
PWM Speed Selection: Normal or Odd
Table 14. PWM Output Speed Selections
PWMS (1...0)
PWM Output Speed
0
1
Normal Speed (384kHz) All Channels
Odd Speed (341.3kHz) All Channels
7.6.6 Zero-Crossing Volume Enable
BIT
R/W
RST
NAME
DESCRIPTION
6
R/W
1
ZCE
Zero-Crossing Volume Enable:
1 – Volume adjustments will only occur at digital zero-crossings
0 – Volume adjustments will occur immediately
The ZCE bit enables zero-crossing volume adjustments. When volume is adjusted on digital zero-cross-
ings no clicks will be audible.
7.6.7 Soft Volume Update Enable
BIT
R/W
RST
NAME
DESCRIPTION
7
R/W
1
SVE
Soft Volume Enable:
1 – Volume adjustments will use soft volume
0 – Volume adjustments will occur immediately
The STA326 includes a soft volume algorithm that will step through the intermediate volume values at a
predetermined rate when a volume change occurs. By setting SVE=0 this can be bypassed and volume
changes will jump from old to new value directly. This feature is only available if individual channel volume
bypass bit is set to ‘0’.
7.7 Configuration Register F (Address 05h)
D7
EAPD
0
D6
PWDN
1
D5
ECLE
0
D4
RES
1
D3
BCLE
1
D2
IDE
1
D1
OCFG1
1
D0
OCFG0
0
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STMICROELECTRONICS [ ST ]
