TDA7420 Datasheet, PDF (19/29 Pages) STMicroelectronics – MULTIFUNCTIONAUDIO PROCESSOR

STEREO DECODER
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
FUNCTION
Input Gain
0
0 1.5dB Input Gain
0
1 4.0dB Input Gain
1
0 6.5dB Input Gain
1
1 9dB Input Gain
Roll Off Adjustement
0
0
1
20.2%
0
1
0
21.9%
0
1
1
23.7%
1
0
0
25.5%
1
0
1
27.3%
1
1
0
29.2%
1
1
1
31%
0
1
1
0
0
1
Deemph. Time Constant 75µs
Deemph. Time Constant 50µs
Forced Mono
Stereo Enabled
Pilot Threshold High
Pilot Threshold Low
TDA7420
NOISE BLANKER 1
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
FUNCTION
Noise Blanker Threshold Vpeak = 0.9V
0
0
0 V_th = 30mV
0
0
1 V_th = 35mV
0
1
0 V_th = 40mV
0
1
1 V_th = 45mV
1
0
0 Vth = 50mV
1
0
1 V_th = 55mV
1
1
0 V_th = 60mV
1
1
1 V_th = 65mV
Noise Blanker Noise Adjusted Threshold Vpeak = 1.4V
0
0
V_th = 140mV
0
1
1
0
1
1
V_th = 180mV
V_th = 240mV
V_th = 280mV
Gain of Overdeviation Detector Vpeak with MPX of 75KHz Deviation
0
0
Detector Off
0
1
Vpeak = 1.2Vop
1
0
Vpeak = 2.0Vop
1
1
Vpeak = 2.8Vop
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