TDA7407 Datasheet, PDF (8/30 Pages) STMicroelectronics – ADVANCED CAR SIGNAL PROCESSOR

TDA7407
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
Test Condition
Carrier and harmonic suppression at the output
α19
Pilot Signal f = 19KHz
α38
Subcarrier f = 38KHz
α57
Subcarrier f = 57KHz
α76
Subcarrier f = 76KHz
Intermodulation (Note 1)
α2
fmod = 10KHz, fspur = 1KHz
α3
fmod = 13KHz, fspur = 1KHz
Traffic Ratio (Note 2)
α57
Signal f = 57KHz
SCA - Subsidiary Communications Authoorization (Note 3)
α67
Signal f = 67KHz
ACI - Adjacent Channel Interference (Note 4)
α114
Signal f = 114KHz
α190
Signal f = 190KHz
Notes to the characteristics:
1. Intermodulation Suppression:
α2 = ^{VO(signal)(at1KHz)} ;
VO(spurious)(at1KHz)
fs = (2 x 10KHz) − 19KHz
α3 = ^{VO(signal)(at1KHz)} ;
VO₍spurious₎₍at1KHz)
fs = (3 x 13KHz) − 38KHz
measured with: 91% pilot signal; fm = 10kHz or 13kHz.
Min.
40
Typ.
50
Max.
75
62
90
65
75
70
75
95
84
Unit
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
2. Traffic Radio (V.F.) Suppression: measured with: 91% stereo signal; 9% pilot signal; fm=1kHz; 5% subcarrier (f = 57kHz,
fm = 23Hz AM, m = 60%)
α57
(V.W>F.)
=
V_O(signal₎₍at1KHz₎
VO_(spurious)(at1KHz ⁺⁄− 23KHz)
3. SCA ( Subsidiary Communications Authorization ) measured with: 81% mono signal; 9% pilot signal; fm = 1kHz; 10%SCA - subcarrier
( fs = 67kHz, unmodulated ).
α67
=
VO_(signa)(lat1KHz_{) ;}
VO_(spurious)(at9KHz)
FS
=
(2
x
38KHz)
−67KHz
4. ACI ( Adjacent Channel Interference ):
α114
=
VO(signal)(at1KHz) _;
VO(spurious)(at4KHz)
FS
=
110KHz
−
(3
x
38KHz)
α190
=
VO(signal)(at1KHz) _;
VO(spurious)(at4KHz)
FS
=
186KHz
−
(5
x
38KHz)
measured with: 90% mono signal; 9% pilot signal; fm =1kHz; 1% spurious signal ( fs = 110kHz or 186kHz, unmodulated).
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