tda9870ah NXP Semiconductors, tda9870ah Datasheet - Page 36

• Manufacturer Part Number: tda9870ah
• Description: Digital Tv Sound Processor Dtvsp
• Manufacturer: NXP Semiconductors

Philips Semiconductors
10.3.3
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.
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.
Data can be read-out in the I
(subaddresses 5 and 6, see Section 10.4), the current peak level will be reset.
Table 16 Subaddress 2 (note 1)
Note
1. The default setting at power-up is 00000000.
Table 17 Monitor output
Table 18 Signal source (note 1)
Note
1. The term ‘crossbar’ refers to the digital selector, where level-adjusted signals from various sources are available.
1999 Dec 20
Digital TV Sound Processor (DTVSP)
7 (MSB)
0 (LSB)
BIT
B4
B2
6
5
4
3
2
1
0
0
1
0
0
0
0
1
1
1
1
M
ONITOR SELECT REGISTER
PEAKMON
NAME
B6
B5
B4
B3
B2
B1
B0
B3
B1
0
1
0
0
0
1
1
0
0
1
1
L input (channel 1, respectively)
R input (channel 2, respectively)
L input
------------------------------------------ -
2
C-bus slave transmitter mode. By reading out level read-out registers
VALUE
B0
1
0
0
0
0
1
0
1
0
1
0
1
+
2
R input
selects the peak level of a source to be monitored
the last sample will be supplied
default value
default value
monitor output (see Table 17)
signal source (see Table 18)
DC output of FM demodulator
audio magnitude/phase, FM demodulator output
crossbar input from FM/AM channel
don’t care
crossbar input from I
crossbar input from I
crossbar input from audio ADC channel
input to Main channel DAC (without beeper)
36
2
2
MONITOR OUTPUT
S1 channel
S2 channel
SIGNAL SOURCE
DESCRIPTION
Product specification
TDA9870A