TDA9874H datasheet(21/56 Pages) PHILIPS

21 / 56 page

1998 Apr 27

Philips Semiconductors

Preliminary speciﬁcation

Digital TV sound demodulator/decoder

TDA9874H

7.3.3

MONITOR SELECT REGISTER (MSR)

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 before or behind the DC filter at the FM/AM demodulator outputs. The last available data sample can be

read-out in the I2C-bus slave transmitter mode (see Section 7.4.5).

Phase means the differentiated phase output of the FM demodulator and is provided, when the demodulator operates in

FM mode, while magnitude is supplied in AM mode.

The default setting at power-up is 00000000.

Table 15 Monitor Select Register (subaddress 2)

Table 16 Description of MSR bits

Table 17 Signal channel selection

Table 18 Signal source selection

76543210

−−−

MCSM1

MCSM0

−

MSS1

MSS0

BIT

SYMBOL

DESCRIPTION

−

These 3 bits are not used and should be set to logic 0.

−

MCSM1

Signal channel select. The state of these 2 bits determine which signal channel is

selected; see Table 17.

MCSM0

−

This bit is not used and should be set to logic 0.

MSS1

Signal source select. The state of these 2 bits determine which signal source is

selected; see Table 18.

MSS0

MCSM1

MCSM0

SIGNAL CHANNEL

Channel 1

Channel 2

MSS1

MSS0

SIGNAL SOURCE

DC output of FM/AM demodulator

magnitude/phase output of FM/AM demodulator

FM/AM path output

NICAM path output

Channel 1

Channel 2

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