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參數(shù)資料
| 型號： | TDA9875AH/V2,557 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | PLASTIC, QFP |
| 文件頁數(shù)： | 32/96頁 |
| 文件大小： | 324K |
| 代理商： | TDA9875AH/V2,557 |
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1999 Dec 20
38
Philips Semiconductors
Product specication
Digital TV Sound Processor (DTVSP)
TDA9875A
10.3.4
CARRIER 1 FREQUENCY REGISTER
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:
where:
data = 24-bit frequency control word
fmix = desired sound carrier frequency
fclk = 12.288 MHz (clock frequency of mixer)
224 = 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 TDA9875A (data = 7509333 in decimal
notation or 72555 in hexadecimal):
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 0000 0000 for all three
bytes.
Most significant part at subaddress 3 and least significant
part at subaddress 5 (see Table 20).
Table 20 Subaddresses 3 to 5
data
f
mix
f
clk
---------
2
24
×
=
SUB-
ADDRESS
BIT
DESCRIPTION
3
7 (MSB)
carrier 1 frequency;
most signicant part
6
5
4
3
2
1
0
4
7
carrier 1 frequency
6
5
4
3
2
1
0
5
7
carrier 1 frequency;
least signicant part
6
5
4
3
2
1
0 (LSB)
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