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| TDA7540N Datasheet, PDF (23/76 Pages) STMicroelectronics – AM/FM car radio tuner IC with stereo decoder and intelligent selectivity system (ISS) | |||
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TDA7540N
Electrical specifications
Table 8.
Stereodecoder electrical characteristics (continued)
(Tamb = 25°C, VCC1 = VCC2 = VCC3 = VCCST= VCCVCO = VCCMIX1 = VCCMIX2 = VCCIF1 = 8.5V,
VMPX = 500mVrms mono, f = 1kHz, deemphasis = 50µs, fXtal = 10.25MHz, in application
circuit, unless otherwise specified).
Symbol
Parameter
Test conditions
Min. Typ. Max. Unit
GAMdelay AM delay filter attenuation
Multipath detector
f = 2.2kHz
2.0
dB
fCMP
Center frequency of multipath- stereo decoder locked on pilot
bandpass
tone
GBPMP Min. band pass gain
MPBPG
4
GBPMP Max. band pass gain
MPBPG
10
GRECTMP Min. rectifier gain
MPRG
-1
GRECTMP Max. rectifier gain
MPRG
4.5
ICHMP Rectifier charge current
MPCC = 0
0.5
ICHMP Rectifier charge current
MPCC = 1
0.2
IDISMP Rectifier discharge current
0.3
Quality detector
19
kHz
6
8
dB
12
14
dB
0
1
dB
7.6 9.5
dB
0.8 1.2
μA
0.4 0.6
μA
0.6 0.8
mA
a
Min. MP influence factor
QDC
a
Max. MP influence factor
QDC
A
Min. noise influence factor QNG
A
Max. noise influence factor QNG
0.5
0.6 0.7
0.9 1.05 1.2
6
dB
15
dB
1. Intermodulation Suppression
a2 = VO(signal,@1KHz) / VO(spurious, @1KHz) ; fs = (2x10KHz) - 19KHz
a3 = VO(signal,@1KHz) / VO(spurious, @1KHz) ; fs = (3x13KHz) - 38KHz
measured with: 91% stereo signal; 9% pilot signal; fm = 10kHz or 13kHz.
2. Traffic Radio (V.F.) Suppression
a57(V,W,F) = VO(signal,@1KHz) / VO(spurious, @1KHz+/-23KHz)
measured with: 91% stereo signal; 9% pilot signal; fm=1kHz; 5% sub carrier (f=57kHz, fm=23Hz AM, m=60%)
3. SCA ( Subsidiary Communications Authorization )
a67 = VO(signal,@1KHz) / VO(spurious, @9KHz) ; fs = (2x38KHz) - 67KHz
measured with: 81% mono signal; 9% pilot signal; fm=1kHz; 10%SCA â sub carrier ( fS = 67kHz, unmodulated ).
4. ACI (Adjacent Channel Interference )
a114 = VO(signal,@1KHz) / VO(spurious, @4KHz) ; fs = 110KHz - (3x38KHz)
a190 = VO(signal,@1KHz) / VO(spurious, @4KHz) ; fs = 186KHz - (5x38KHz)
measured with: 90% mono signal; 9% pilot signal; fm=1kHz; 1% spurious signal ( fS = 110kHz or 186kHz, unmodulated).
5. All thresholds are measured inTestmode at the quality output. The thresholds are calculated by
VNBTH - VPEAK
VPEAK is adjusted by applying a 150kHz sinewave at MPXIN.
23/76
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