TDA9874A Philips Semiconductors, TDA9874A Datasheet - Page 32

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

Philips Semiconductors
10.3.4
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 19 Monitor select register (subaddress 2)
Table 20 Description of the MSR bits
Table 21 Signal channel selection
1999 Dec 03
Digital TV sound demodulator/decoder
MCSM1
PEAK
BIT
7
7
6
5
4
3
2
1
0
0
0
1
M
ONITOR
SYMBOL
MCSM1
MCSM0
MCSM0
S
PEAK
MSS1
MSS0
ELECT
6
0
0
1
0
R
EGISTER
Peak level select: when 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 2 bits are not used and should be set to logic 0
Signal channel select: the state of these 2 bits determine which signal channel is
selected; see Table 21.
this bit is not used and should be set to logic 0
Signal source select: the state of these 2 bits determine which signal source is
selected; see Table 22.
CH1
CH2
CH1
----------------------------- -
SIGNAL CHANNEL
+
2
5
0
(MSR)
CH2
MCSM1
4
32
Table 22 Signal source selection
MCSM0
2
MSS1
C-bus slave transmitter mode (see Section 10.4.5).
3
DESCRIPTION
0
0
1
1
MSS0
2
0
0
1
0
1
DC output of FM/AM
demodulator
magnitude/phase output
of FM/AM demodulator
FM/AM path output
NICAM path output
MSS1
Preliminary specification
SIGNAL SOURCE
1
TDA9874A
MSS0
0