TDA9874A Philips Semiconductors, TDA9874A Datasheet - Page 45

• Manufacturer Part Number: TDA9874A
• Description: Digital TV sound demodulator/decoder
• Manufacturer: Philips Semiconductors

Philips Semiconductors
Table 56 Auto-select function (TVSM = HIGH and IDSWFM = HIGH): FM mode/NICAM mode for stereo DAC
Note
1. X = don’t care.
Signal source selection bits SDOS1 and SDOS0 must be set to 0X for FM mode (including FM mode by switching if
auto-mute select is set LOW) or 01 for NICAM mode, when using the auto-select function.
10.3.19 D
The default setting after Power-on reset is 00000000.
Table 57 Digital Audio Interface Configuration Register (subaddress 21)
Table 58 Description of the DAICONR bits
Table 59 System clock frequency select
1999 Dec 03
Digital TV sound demodulator/decoder
OUTPUT CHANNEL SELECTION
CSM2
BIT
0
0
7
0
7
6
5
4
3
2
1
0
SYSCL1
IGITAL
0
0
1
1
A
SYMBOL
I
SYSOUT
MODE
CSM1
SYSCL1
SYSCL0
2
UDIO
I
SFORM
2
SOUT
0
1
6
0
I
NTERFACE
these 3 bits are not used and should be set to logic 0
System clock frequency select: these 2 bits select the frequency of the system clock;
see Table 59
System clock output on/off: when SYSOUT = 1 it enables the output of a system (or
master) clock signal at pin SYSCLK. When SYSOUT = 0, the output will be off, thereby
improving EMC performance.
Serial output format: when I
format, i.e. a level change at the word select pin indicates the beginning of a new audio
sample. When I
I
(2 pins) plus serial bit clock and word select in a format determined by the I
The TDA9874A then is an I
will be 3-stated, thereby improving EMC performance.
2
CSM0
S-bus output on/off: when I
X
C
0
(1)
ONFIGURATION
5
0
SYSCL0
0
1
0
1
MONO
FM IDENT/NICAM SOUND MODE
2
M/M
M/M
SFORM = 0, it selects the standard I
SYSCL1
R
4
EGISTER
2
45
STEREO
S-bus master. When I
2
(DAICONR)
SFORM = 1 it selects an MSB-aligned, MSB-first output
2
L/R
L/R
SOUT = 1 it enables the output of serial audio data
SYSCL0
SYSCLK OUTPUT
3
DESCRIPTION
256f
384f
512f
768f
DUAL
A/A
B/B
s
s
s
s
SYSOUT
2
2
SOUT = 0, the outputs mentioned
2
S-bus output format.
AUTO-MUTE = HIGH
AND CH2MOD = 10
I
2
SFORM
Preliminary specification
FM/AM: M/M
FM/AM: M/M
1
FREQUENCY
TDA9874A
12.288
16.384
24.576
(MHz)
8.192
2
SFORM bit.
I
2
SOUT
0