TDA7402 Datasheet, PDF (25/59 Pages) STMicroelectronics – CARRADIO SIGNAL PROCESSOR

TDA7402
1.16 Audioprocessor Testing
During the Testmode, which can be activated by setting bit D₀ of the stereodecoder testing-byte and the audio-
processor testing byte, several internal signals are available at the FD2R- pin. During this mode the input re-
sistance of 100kOhm is disconnected from the pin. The internal signals available are shown in the Data-byte
specification.
2.0 STEREODECODER PART
2.1 FEATURES:
s no external components necessary
s PLL with adjustment free, fully integrated VCO
s automatic pilot dependent MONO/STEREO switching
s very high suppression of intermodulation and interference
s programmable Roll-Off compensation
s dedicated RDS-Softmute
s Highcut- and Stereoblend-characterisctics programmable in a wide range
s FM/AMNoiseblanker with several threshold controls
s Multipath-detector with programmable internal/external influence
s I²C-bus control of all necessary functions
2.2 ELECTRICAL CHARACTERISTICS
V_S = 9V, deemphasis time constant = 50µs, MPX input voltage V_MPX = 500mV (75kHz deviation), modulation
frequency = 1kHz, input gain = 6dB, T_amb = 27°C, unless otherwise specified.
Symbol
Parameter
Test Conditio n
Min. Typ. Max. Unit
V_in MPX Input Level
Input Gain = 3.5dB
0.5
1.25 V_rms
R_in Input Resistance
100
kΩ
G_min Min. Input Gain
3.5
dB
G_max Max. Input Gain
11
dB
G_step Step Resolution
2.5
dB
SVRR Supply Voltage Ripple Rejection V_ripple = 100mV, f = 1kHz
60
dB
a
Max. Channel Separation
50
dB
THD Total Harmonic Distortion
f_in=1kHz, mono
0.02 0.3
%
S+N
N
Signal plus Noise to Noise Ratio A-weighted, S = 2V_rms
91
dB
MONO /STEREO-S WITCH
V_PTHST1 Pilot Threshold Voltage
V_PTHST0 Pilot Threshold Voltage
V_PTHMO1 Pilot Threshold Voltage
for Stereo, PTH = 1
for Stereo, PTH = 0
for Mono, PTH = 1
15
mV
25
mV
12
mV
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