參數(shù)資料
型號: TDA9875
廠商: NXP SEMICONDUCTORS
元件分類: 消費家電
英文描述: Digital TV Sound Processor DTVSP
中文描述: SPECIALTY CONSUMER CIRCUIT, PDIP64
文件頁數(shù): 36/92頁
文件大小: 279K
代理商: TDA9875
1998 Feb 13
36
Philips Semiconductors
Preliminary specification
Digital TV Sound Processor (DTVSP)
TDA9875
Table 18
Monitor output
10.3.3.3
Note
By reading out Level Read-out Registers (subaddresses
5 and 6, see Section 10.4), the current peak level will be
reset.
10.3.4
C
ARRIER
1
FREQUENCY REGISTER
10.3.4.1
Description
The three bytes together constitute a 24-bit frequency
control word to represent the sound carrier (i.e. mixer)
frequency in accordance with the following formula:
f
clk
Where:
Data = 24-bit frequency control word
f
mix
= desired sound carrier frequency
f
clk
= 12.288 MHz (clock frequency of mixer)
2
24
= 16777216 (number of steps in a 24-bit word size).
Example: A 5.5 MHz sound carrier frequency will be
generated by sending the following sequence of data
bytes to the TDA9875 (data = 7509333 in decimal notation
or 729555 in hex): 01110010 10010101 01010101.
As three bytes are required to define a carrier frequency,
execution of this command starts only after all bytes have
been received. If an error occurs, e.g. a premature STOP
condition, partial data for this function is ignored.
The default setting at power-up is 00000000 for all three
bytes.
10.3.4.2
Definition
Most significant part at subaddress 3.
B4
B3
MONITOR OUTPUT
0
0
0
1
1
0
L input (channel 1, respectively)
R input (channel 2, respectively)
L input
R input
+
2
data
-f
2
24
×
=
Table 19
Subaddresses 3 to 5
10.3.5
C
ARRIER
2
FREQUENCY REGISTER
10.3.5.1
Description
Same as for sound carrier 1.
If the carrier 2 frequency register is used, it will be for either
the second FM sound carrier of a terrestrial or satellite FM
program or the NICAM sound carrier.
10.3.5.2
Definition
Subaddresses 6 to 8.
Same as for sound carrier 1, except for subaddresses
used.
BIT
SUBADDRESSES
7 (MSB)
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0 (LSB)
3
4
5
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