TDA7461N Datasheet, PDF (12/31 Pages) STMicroelectronics – CAR RADIO SIGNAL PROCESSOR

TDA7461N
STEREODECODER PART
No external components necessary
PLL with adjustment free fully integrated VCO
Automatic pilot dependent MONO/STEREO
switching
Very high suppression of intermodulation and
interference
Programmable Roll-Off compensation
Dedicated RDS Softmute
Highcut and Stereoblend characterisctics pro-
grammable in a wide range
Internal Noiseblanker with threshold controls
Multipath detector with programmable inter-
nal/external influence
I²C bus control of all necessary functions
ELECTRICAL CHARACTERISTICS (V_S = 9V; deemphasis time constant = 50µs, VMPX = 500mV,
75KHz deviation, f = 1KHz. GI = 6dB, Tamb = 25°C; unless otherwise specified).
Symbol
VIN
Rin
Gmin
Gmax
GSTEP
SVRR
α
THD
S+ N
N
Parameter
MPX Input Level
Input Resistance
Minimum Input Gain
Max Input Gain
Step Resolution
Supply Voltage Ripple Rejection
Max Channel Separation
Total Harmonic Distortion
Signal plus Noise to Noise Ratio
Test Condition
Input Gain = 3.5dB
Vripple = 100mv, f = 1khz
S = 2Vrms
Min.
70
1.5
8.5
1.75
30
80
Typ.
0.5
100
3.5
11
2.5
55
50
0.02
91
Max.
1.25
130
4.5
12.5
3.25
0.3
Unit
VRMS
KΩ
dB
dB
dB
dB
dB
%
dB
MONO/STEREO SWITCH
VPTHST1 Pilot Threshold Voltage
VPTHST0 Pilot Threshold Voltage
VPTHMO1 Pilot Threshold Voltage
VPTHMO0 Pilot Threshold Voltage
for Stereo, PTH = 1
for Stereo, PTH = 0
for Mono, PTH = 1
for Stereo, PTH = 0
PLL
∆f/f
Capture Range
DEEMPHASIS and HIGHCUT (5)
τHC50
Deemphasis Time Constant
τHC75
Deemphasis Time Constant
τHC50
Highcut Time Constant
τHC75
Highcut Time Constant
Bit = 7, Subadr. 10 = 0
VLEVEL >> VHCH
Bit = 7, Subadr. 10 = 1
VLEVEL >> VHCH
Bit = 7, Subadr. 10 = 0
VLEVEL >> VHCL
Bit = 7, Subadr. 10 = 1
VLEVEL >> VHCL
STEREOBLEND and HIGHCUT-CONTROL
REF5V Internal Reference Voltage
TCREF5V Temperature Coefficient
LGmin
Min. LEVEL Gain
LGmax
Max. LEVEL Gain
LGstep
LEVEL Gain Step Resolution
VSBLmin Min.Voltage for Mono
VSBLmax Max. Voltage for Mono
VSBLstep Step Resolution
10
15
25
mV
15
25
35
mV
7
12
17
mV
10
19
25
mV
0.5
%
25
50
75
µs
50
75
100
µs
100 150 200
µs
150 225 300
µs
4.7
5
5.3
V
3300
ppm
-1
0
+1
dB
8
10
12
dB
0.3 0.67 1.0
dB
29
33
37 %REF5V
54
58
62 %REF5V
5.0
8.4
12 %REF5V
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