TDA7402 Datasheet, PDF (27/59 Pages) STMicroelectronics – CARRADIO SIGNAL PROCESSOR

2.2 ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
Test Conditio n
α57 Subcarrier f=57kHz
α76 Subcarrier f=76kHz
Intermodulation (Note 2.3.1)
α2 f_mod=10kHz, f_spur=1kHz
α3
f_mod=13kHz, f_spur=1kHz
Traffic Radio (Note 2.3.2)
α57 Signal f=57kHz
SCA - Subsidiary Communications Authorization (Note 2.3.3)
α67 Signal f = 67kHz
ACI - Adjacent Channel Interference (Note 2.3.4)
α114 Signal f=114kHz
α190 Signal f=190kHz
TDA7402
Min. Typ. Max. Unit
62
dB
90
dB
65
dB
75
dB
70
dB
75
dB
95
dB
84
dB
2.3 NOTES TO THE CHARACTERISTICS
2.3.1 Intermodulation Suppression
α2 = _V----VO----₍^O---s-⁽---ps---u-i-g--r--n-i-o--a--u--l--⁾_s--⁽--₎-a-₍---ta--1--t--k1---H-k---Hz----⁾-z--₎;- _sf = (2 ⋅ 10k Hz) – 19kH z
α3
=
----^V-----^O----⁽--^s----ⁱ--^g----ⁿ---^a----^l--⁾---⁽--^a----^t--¹----^k---^H-----^z---⁾---
V_O (spuri ous )(at1kHz)
-;f_s
=
(3 ⋅ 13k H z) – 38k H z
measured with: 91% pilot signal; fm = 10kHz or 13kHz.
2.3.2 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(s purious )(at1kHz ± 23k Hz)
measured with: 91% stereo signal; 9% pilot signal; fm=1kHz; 5% subcarrier (f=57kHz, fm=23Hz AM, m=60%)
2.3.3 SCA ( Subsidiary Communications Authorization )
α67
=
----^V-----^O----⁽--^s----ⁱ--^g----ⁿ---^a----^l--⁾--⁽---^a----^t--¹----^k---^H-----^z---⁾--- -;f
V_O( spuri ous) (at1kHz)
s
=
(2 ⋅ 38kH z) – 67kH z
measured with: 81% mono signal; 9% pilot signal; fm=1kHz; 10%SCA - subcarrier ( f_S = 67kHz, unmodulated ).
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