TDA7340 Datasheet, PDF (8/16 Pages) STMicroelectronics – AUDIO SIGNAL PROCESSOR

TDA7340
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
NOISE INTERFERENCE DETECTOR
V_TR
Trigger Threshold (1)
(see pulse slope fig 3)
V_RECT
Rectifier Voltage
T_S
Suppression Pulse Duration
IOS
Input Offset Current During
Suppression Time
Test Condition
meas. with
NTB = 00
V_RECT = 1.2V _{NTB = 10}
NTB = 11
meas. with
NTB = 00
V_RECT = 1.4V _{NTB = 10}
NTB = 11
V_MPXIN = 0mV
VMPXIN = 50mV;f = 150KHz
V_MPXIN = 100mV; f = 150KHz
CBLANK = 470pF
(1) NTB represent the STDEC programming bit pair D6, D5 for the noise blanker trigger threshold
Min.
0.5
2.0
Typ.
100
130
170
150
200
250
0.9
1.5
2.5
40
10
Max.
1.3
3.0
Unit
mV_P
mVP
mV_P
mV_P
mV_P
mV_P
V
V
V
µs
pA
NOTES TO THE CHARACTERISTICS
1 INTERMODULATION SUPPRESSION
α2
=
V_O (signal) (at1KHz)
V_O (spurious) (at1KHZ)
;
fs
=
(2
x
10KHz)
-
19KHz
α3
=
V_O (signal) (at1KHz)
V_O (spurious) (at1KHZ)
;
fs
=
(3
x
13KHz)
-
38KHz
measured with : 91% mono signal; 9% pilot signal; fm=10KHz or 13KHz
2. TRAFFIC RADIO (V.F.) suppression
α57 (V.W.F.) = _VO
V_O(signal) (at1KHz)
(spurious) (at1KHZ ±23Hz)
measured with : 91% stereo signal; 9% pilot signal; fm=1KHz; 5% subcarrier
(f=57KHz, fm = 23Hz AM, m = 60%)
3. SCA (SUBSIDIARY COMMUNICATIONS AUTHORIZATION)
α67
=
VO(signa)l (at1KHz)
V_O (spurious) (at9KHZ)
;
fs
=
(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 (signal) (at1KHz)
V_O (spurious) (at4KHZ)
;
f_s
=
110KHz -
(3
x
38KHz)
α190
=
VO (signal) (at1KHz)
V_O (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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