TDA7540B Datasheet, PDF (56/75 Pages) STMicroelectronics – AM/FM Car Radio Tuner IC with Stereo Decoder and Intelligent Selectivity System (ISS)

Software specification
TDA7540B
Table 35. Addr 24 Stereodecoder 1
MSB
LSB
d7 d6 d5 d4 d3 d2 d1 d0
Function
0 Test mode stereodecoder and audioprocessor “ON”
1 Test mode stereodecoder and audioprocessor “OFF”
0
Audio AM noise blanker fix threshold disable
1
0
Audio AM noise blanker fix threshold enable
Fast clock for testing audioprocessor “ON”
1
Fast clock for testing audioprocessor “OFF”
0
Audio inverter OFF
1
00
Audio inverter ON
Audio noise blanking time (FM = 38µs, AM = 1.2 ms)
01
10
11
Audio noise blanking time (FM = 25,5µs, AM = 0.8 ms)
Audio noise blanking time (FM = 32µs, AM = 1.0 ms)
Audio noise blanking time (FM = 22µs, AM = 0.64 ms)
0
Stereodecoder VCO adjust minus
1
Stereodecoder no VCO adjust
0
Stereodecoder VCO adjust plus
1
Stereodecoder no VCO adjust
Table 36. Addr 25 Stereodecoder 2
MSB
LSB
d7 d6 d5 d4 d3 d2 d1 d0
Function
0 Stereo decoder mute disable
1 Stereo decoder mute enable
0
Stereo decoder “ON” if muted
1
Stereo decoder “OFF” if muted
0
Forced MONO, must be set in AM
1
MONO/STEREO switch automatically
0
Noise blanker peak charge current low
1
Noise blanker peak charge current high
0
Pilot threshold high
1
Pilot threshold low
0
Deemphasis 50µs
1
Deemphasis 75µs
00
Stereodecoder ingain = 3,75dB
01
Stereodecoder ingain = 2,5dB
56/75