tda9874aps NXP Semiconductors, tda9874aps Datasheet - Page 24

• Manufacturer Part Number: tda9874aps
• Description: Digital Tv Sound Demodulator/decoder
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7.3.4
This register is used to define the signal source (the level of which is to be monitored) and the signal channel. Data can
be monitored e.g. before or after the DC filter at the FM/AM demodulator outputs. The peak level of signals can also be
observed. The last available data sample can be read out in the I
Phase means the differentiated phase output of the FM demodulator and is provided when the demodulator operates in
FM mode. The magnitude is supplied in AM mode.
The default setting after Power-on reset is 0000 0000.
Table 17 Monitor select register (subaddress 2)
Table 18 Description of the monitor select register bits
Table 19 Signal channel selection
Table 20 Signal source selection
2000 Aug 04
Digital TV sound demodulator/decoder
MCSM1
PEAK
MSS1
BIT
7
7
6
5
4
3
2
1
0
0
0
1
0
0
1
1
M
ONITOR
SYMBOL
MCSM1
MCSM0
MCSM0
S
PEAK
MSS1
MSS0
MSS0
ELECT
6
0
0
1
0
0
1
0
1
R
EGISTER
Peak level select: if bit PEAK = 1 it selects the rectified peak level of a source to be
monitored. Peak level value is reset to logic 0 after read-out (see read registers
5 and 6). After changing the monitor signal source for peak calculation it is advisable to
ignore the first read-out value due to stored data from previous calculations.
these bits are not used and should be set to logic 0
Signal channel select: the state of these bits determine which signal channel is
selected; see Table 19.
this bit is not used and should be set to logic 0
Signal source select: the state of these bits determine which signal source is selected;
see Table 20.
CH1
CH2
DC output of FM/AM demodulator
magnitude/phase output of FM/AM demodulator
FM/AM path output
NICAM path output
CH1
----------------------------- -
+
2
5
0
(MSR)
CH2
MCSM1
4
24
MCSM0
SIGNAL CHANNEL
SIGNAL SOURCE
2
C-bus slave transmitter mode (see Section 7.4.5).
3
DESCRIPTION
2
0
MSS1
1
Product specification
TDA9874A
MSS0
0