Tripath Technology, Inc. – Preliminary Technical Information
Automatic DC Offset Calibration Control
Addr
2Fh
Register Name
Automatic DC Calibration Control
Default
D7
0
D6
CAB
0
D5
CFH2
0
D4
CFH1
0
D3
CF4
0
D2
CF3
0
D1
CF2
0
D0
CF1
0
0
The CFn bits control which DC offset calibration values will be used. If a particular channel’s CFn bit is set to
‘1’, the value stored in the Calibration Bank registers will be used. If CFn is cleared to ‘0’, the Automatic DC
Offset Calibration values that were calculated after coming out of hard mute will be used.
Setting the CAB bit to ‘1’ will bypass Automatic DC Offset Calibration. DCX works in conjunction with the
CAB bit. DCX should be set to the same value as CAB.
For normal operation, CFH1 and CFH2 should be set to ‘1’.
Calibration Bank
Addr
30h
31h
32h
33h
34h
35h
36h
37h
Register Name
Calibration Bank
Calibration Bank
Calibration Bank
Calibration Bank
Calibration Bank
Calibration Bank
Calibration Bank
Calibration Bank
Default
D7
CB19
CB29
CB39
0
D6
CB18
CB28
CB38
0
D5
D4
D3
D2
D1
D0
CB17
CB27
CB37
CB31
CB47
CH17
CH27
CH21
0
CB16
CB26
CB36
CB30
CB46
CH16
CH26
CH20
0
CB15
CB25
CB35
CB21
CB45
CH15
CH25
CH11
0
CB14
CB24
CB34
CB20
CB44
CH14
CH24
CH10
0
CB13
CB23
CB33
CB11
CB43
CH13
CH23
CB41
0
CR12
CR22
CR32
CR10
CR42
CH12
CH22
CR40
0
CB49
CH19
CH29
0
CB48
CH18
CH28
0
0
0
These registers store calibration values that can be forced instead of the automatic DC calibration values.
Register 2Fh controls whether the automatic values will be used or the Calibration Bank values. The DC
calibration values are 10 bit words so they are stored in separate bytes. For example, for channel 1, the 8
most significant bits are stored in register 30h, while the 2 least significant bits are stored in register 05h –
bits D1 and D0.
For normal operation, all CH1n and CH2n bits should be cleared to ‘0’.
Force DC
Addr
38h
Register Name
Force DC
D7
FD7
0
D6
FD6
0
D5
FD5
0
D4
FD4
1
D3
FD3
1
D2
FD2
1
D1
FD1
0
D0
FD0
0
Default
This register is used to force a DC offset in the system. It is used for testing purposes. It should be changed
from its default setting to 00h for normal operation.
29
TCD6001 – JL/Rev. 0.9/07.05
TRIPATH [ TRIPATH TECHNOLOGY INC. ]
