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參數(shù)資料
| 型號： | TDA8204B |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | NICAM DECODER |
| 中文描述： | 麗音解碼器 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 227K |
| 代理商： | TDA8204B |
CR2 : NICAM control (read and write register)
SDI
0
MSB
SDI
ECT
0
MAE
0
FN1
0
UMT
0
LA1
0
LA0
0
BEA
1
LSB
: I
2
S direction
0 = Output, 1 = Input
ECT : Bit error rate counting time
0 = 128ms, 1 = 64ms
MAE : Max allowed errors
0 = 511, 1 = 255
FN1 : Set function of bit 0 in SR0, 0 = loss of
alignment (status), 1 = system status (I or
B/G)
UMT : Un-mute NICAM, 1 = un-mute, 0 = mute
LA1
: Language select 1 (LA1
⊕
SEL1)
LA0
: Language select 0 (LA0
⊕
SEL0)
BEA : Set C1-C3 function
ECT
MAE
0
0
8.9 x 10
-3
(1 in 112)
0
1
4.4 x 10
-3
(1 in 225)
1
0
1.8 x 10
-2
(1 in 56)
1
1
8.9 x 10
-3
(1 in 112)
Un-mute at BER/4.
BER MUTE
TDA8204B
Output (Pin)
C1 (21)
C2 (20)
C3 (19)
* Application control bit of NICAM signal
Note :
C4 pin remains unchanged. The function of C1-C4 in SR0
remains unchanged.
BEA
0
1
C1*
C2*
C3*
Single mono mode
Dual mono mode
Stereo mode
CR3 : Switches (read and write register)
US1
0
MSB
US1 : User bit 1 (output)
US0 : User bit 0 (output)
AUT : Automatic selection, 1 = enable
IBG
: Select system I or B/G, 1 = B/G
FSn
: Force switch (see table)
SYN : 1 = synthesiser, 0 = dual VCXO
(carrier loop)
FS1
FS0
0
0
0
1
1
0
1
1
US0
0
AUT
1
IBG
0
FS1
0
FS0
0
X
0
SYN
1
LSB
Selection
Auto NICAM
FM-Mono
FM-Stereo
NICAM
NICAM STAND-ALONE APPLICATION
The NICAM kit has been designed to be monitored
by the I
2
C bus; nevertheless stand-alone working
capability is offered to the designer for low cost
applications.
In order to know the status of the kit in stand-alone
mode, consider the contents of the four I
2
C regis-
ters at power-ON (4 registers : SR0 - CR1 - CR2 -
CR3). Hardware configurable pins will be described
later.
1 - Power-ON Configuration
SR0 (status)
US2
C1
C2
C3
US2
0
0
0
MSB
US2
:
Not used in stand-alone
C1
:
Application control bit status for
NICAM signal
C3
:
C4
:
Reserve Sound Flag
MUT
:
DAC outputs muted (demuted as soon
as NICAM appears)
LA2
:
the subframe alignment is been lost
L/S
:
FAW status (FN1 of CR2 = 0)
C4
1
MUT
1
LA2
1
L/S
1
LSB
C2
:
CR1 (R/W)
Q1
0
MSB
Q1
Q0
I2
I1
G0
AUM :
FRE
Q0
0
I2
0
I1
0
I0
0
G0
0
AUM
0
FRE
0
LSB
:
:
:
:
:
NICAM sound is sent on all matrix
outputs and on AMOx pins
Gain = 0dB on AMOx
AMOx pins un-muted
VCXO in normal mode
:
CR2 (R/W)
SDA
0
MSB
SDA
ECT &
MAE
FN1
ECT
0
MAE
0
FN1
0
UMT
0
LA1
0
LA0
0
BEA
1
LSB
:
:
Normal mode
BER = 1/112
:
Bit L/S of SR0 set to alignment loss
status
TDA8204B mute pin 25 to 0
Result depending of SEL1
Result depending of SEL0
Beacon decoding mode but all diodes
are OFF until a NICAM signal has been
found
UMT
LA1
LA0
BEA
:
:
:
:
CR3 (R/W)
US1
0
MSB
US1
US0
AUT
US0
0
AUT
1
IBG
0
FS1
0
FS0
0
X
0
SYN
1
LSB
:
:
:
Not used in stand-by mode
Not used in stand-by mode
Automatic standard
TDA8204B
8/12
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