Datasheet

STA309A Registers
Doc ID 13855 Rev 4 31/67
7.2.7 Configuration register G (0x06)
The STA309A features a DDX processing mode that minimizes the amount of noise
generated in frequency range of AM radio. This mode is intended for use when DDX is
operating in a device with an AM tuner active. The SNR of the DDX processing is reduced to
~83 dB in this mode, which is still greater than the SNR of AM radio.
The STA309A features a 2 DDX processing modes that minimize the amount of noise
generated in frequency range of AM radio. This second mode is intended for use when DDX
is operating in a device with an AM tuner active. This mode eliminates the noise-shaper.
Channels 7 and 8 can be configured to be processed and output in such a manner that
headphones can be driven using and appropriate output device. This signal is a differential
3-wire drive called DDX Headphone.
D7 D6 D5 D4 D3 D2 D1 D0
MPCV DCCV HPE AM2E AME COD SID PWMD
00000000
Table 34. Register G bit definitions
Bit RW RST Name Description
0RW0PWMD
PWM output disable:
0: PWM output normal
1: no PWM output
1RW0SID
Serial interface (I
2
S out) disable:
0: I
2
S output normal
1: no I
2
S output
2RW0COD
Clock output disable:
0: clock output normal
1: no clock output
3RW0AME
AM mode enable:
0: normal DDX operation.
1: AM reduction mode DDX operation.
Table 35. AM2E bit
Bit RW RST Name Description
4RW 0AM2E
AM2 mode enable:
0: normal DDX operation.
1: AM2 reduction mode DDX operation.
Table 36. HPE bit
Bit RW RST Name Description
5RW 0HPE
DDX headphone enable:
0: channels 7 and 8 normal DDX operation
1: channels 7 and 8 headphone operation