TDA7406 Datasheet, PDF (29/64 Pages) STMicroelectronics – Car radio signal processor

TDA7406
Stereodecoder part
Table 5.
Symbol
Stereodecoder electrical characteristics (continued)
V_S = 9V, de-emphasis time constant = 50µs, MPX input voltage VMPX = 500mV (75kHz
deviation), modulation frequency = 1kHz, input gain = 6dB, T_amb = 27°C, unless
otherwise specified.
Parameter
Test Conditions
Min. Typ. Max.
Unit
Intermodulation (Note 1)
α2
f_mod=10kHz, f_spur=1kHz
α3
f_mod=13kHz, f_spur=1kHz
Traffic Radio (Note 2)
α57 Signal f=57kHz
65
dB
75
dB
70
dB
SCA - Subsidiary Communications Authorization (Note 3)
α67 Signal f=67kHz
75
dB
ACI - Adjacent Channel Interference (Note 4)
α114 Signal f=114kHz
α190 Signal f=190kHz
95
dB
84
dB
Notes to the characteristics:
1. Intermodulation Suppression:
α2
=
----^V----^O----⁽--^s--ⁱ--^g---ⁿ---^a---^l-⁾--⁽--^a---^t-¹---^k---^H----^z--⁾----
V_{O(spurious)(at1kHz)}
;
f_s
=
(2
x
10kHz)
-
19kHz
α3
=
----^V----^O----⁽--^s--ⁱ--^g---ⁿ---^a---^l-⁾--⁽--^a---^t-¹---^k---^H----^z--⁾----
V_{O(spurious)(at1kHz)}
;
f_s
=
(3
x
13kHz)
-
38kHz
measured with: 91% pilot signal; fm = 10kHz or 13kHz.
2. Traffic Radio (V.F.) Suppression:
α57(V.W > F.) = -------------^V----^O----⁽--^s---ⁱ-^g---ⁿ---^a---^l--⁾--⁽-^a---^t--¹---^k---^H---^z---⁾-------------
V_{O(spurious)(at1kHz ± 23kHz)}
measured with: 91% stereo signal; 9% pilot signal; fm= 1 kHz; 5% subcarrier (f = 57kHz, fm = 23Hz AM, m = 60%)
3. SCA (Subsidiary Communications Authorization)
α67
=
----^V----^O----⁽--^s--ⁱ--^g---ⁿ---^a---^l-⁾--⁽--^a---^t-¹---^k---^H----^z---⁾--
V_{O(spurious)(at9kHz)}
;
F_s
=(2
x
38kHz)
-
67kHz
measured with: 81% mono signal; 9% pilot signal; fm = 1kHz; 10%SCA - subcarrier ( fs = 67kHz, unmodulated ).
4. ACI ( Adjacent Channel Interference ):
α114
=
----^V----^O----⁽--^s--ⁱ--^g---ⁿ---^a---^l-⁾--⁽--^a---^t-¹---^k---^H----^z---⁾---
V_{O(spurious)(at4kHz)}
;
F_s
=
110kHz
-
(3
x
38kHz)
α190
=
----^V----^O----⁽--^s--ⁱ--^g---ⁿ---^a---^l-⁾--⁽--^a---^t-¹---^k---^H----^z---⁾---
V_{O(spurious)(at4kHz)}
;
F_s
=
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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