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參數(shù)資料
| 型號(hào)： | 935263704518 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO DEMODULATOR, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁數(shù)： | 31/71頁 |
| 文件大小： | 304K |
| 代理商： | 935263704518 |
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2000 Aug 04
37
Philips Semiconductors
Product specication
Digital TV sound demodulator/decoder
TDA9874A
Table 54 Auto-select function (bit TVSM = 1 and bit IDSWFM = 1): FM mode/NICAM mode for stereo DAC
Note
1. X = don’t care.
Signal source selection bits SDOS1 and SDOS0 must be set to logic 0X for FM mode (including FM mode by switching
if auto-mute select is set to logic 0) or to logic 01 for NICAM mode, when using the auto-select function.
7.3.19
DIGITAL AUDIO INTERFACE CONFIGURATION REGISTER (DAICONR)
The default setting after Power-on reset is 0000 0000.
Table 55 Digital audio interface conguration register (subaddress 21)
Table 56 Description of the digital audio interface conguration register bits
OUTPUT CHANNEL SELECTION
MODE
FM IDENT/NICAM SOUND MODE
AUTO-MUTE = HIGH;
CH2MOD = 10
CSM2
CSM1
CSM0
MONO
STEREO
DUAL
00
X(1)
M/M
L/R
A/A
FM/AM: M/M
0
1
0
M/M
L/R
B/B
FM/AM: M/M
76543210
0
SYSCL1
SYSCL0
SYSOUT
I2SFORM
I2SOUT
BIT
SYMBOL
DESCRIPTION
7
these bits are not used and should be set to logic 0
6
5
4
SYSCL1
System clock frequency select: these bits select the frequency of the system clock;
see Table 57.
3
SYSCL0
2
SYSOUT
System clock output on/off: if bit SYSOUT = 1 it enables the output of a system (or
master) clock signal at pin SYSCLK. If bit SYSOUT = 0 the output will be off, thereby
improving EMC performance.
1
I2SFORM
Serial output format: if bit I2SFORM = 1 it selects an MSB-aligned, MSB-rst output
format, i.e. a level change at the word select pin indicates the beginning of a new audio
sample. If bit I2SFORM = 0 it selects the standard I2S-bus output format.
0
I2SOUT
I2S-bus output on/off: if bit I2SOUT = 1 it enables the output of serial audio data (2 pins)
plus serial bit clock and word select in a format determined by the bit I2SFORM.
The TDA9874A then is an I2S-bus master. If bit I2SOUT = 0 the outputs mentioned will
be 3-stated, thereby improving EMC performance.
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