TDA9875 datasheet(35/92 Pages) PHILIPS

35 / 92 page

1998 Feb 13

Philips Semiconductors

Preliminary speciﬁcation

Digital TV Sound Processor (DTVSP)

TDA9875

10.3.3

MONITOR SELECT REGISTER

10.3.3.1

Description

This register is used to define the signal source, the level of which is to be monitored, and if the peak level is to be

monitored. Peak level refers to the magnitude of the maximum excursion of a signal. Data can be read-out in the I2C-bus

slave transmitter mode (see Section 10.4, subaddresses 5 and 6).

Audio magnitude/phase is related to the FM demodulator output. Phase information is provided, when it operates in

FM mode, while magnitude is supplied in AM mode.

Table 15 Description of bit PEAKMON

10.3.3.2

Deﬁnition

Table 16 Subaddress 2 (notes 1, 2 and 3)

Notes

1. X = don’t care.

2. PEAKMON is described in Section 10.3.3.1.

3. The default setting at power-up is 00000000.

Table 17 Signal source (note 1)

Note

1. The term ‘crossbar’ refers to the digital selector, where level-adjusted signals from various sources are available.

NAME

HIGH/LOW

FUNCTION

PEAKMON

HIGH

selects the peak level of a source to be monitored

LOW

the last sample will be supplied

MSB

LSB

PEAKMON

see Table 18

see Table 17

SIGNAL SOURCE

DC output of FM demodulator

audio magnitude/phase, FM demodulator output

crossbar input from FM/AM channel

crossbar input from NICAM channel

crossbar input from I2S1 channel

crossbar input from I2S2 channel

crossbar input from audio ADC channel

input to Main channel DAC (without beeper)

TDA9875 Datasheet(PDF) 35 Page - NXP Semiconductors

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