TDA7411 Datasheet, PDF (19/43 Pages) STMicroelectronics – ADVANCED CAR SIGNAL PROCESSOR

TDA7411
carrier (f = 57kHz, fm = 23Hz AM, m = 60%)
α57(V.W > F.) = --------------^V----^O----⁽--^s---ⁱ-^g---ⁿ---^a---^l--⁾--⁽--^a---^t--¹---^k---^H----^z--⁾--------------
V_{O(spurious)(at1kHz ± 23kHz)}
3. SCA ( Subsidiary Communications Authorization ) measured with: 81% mono signal; 9% pilot signal;
fm = 1kHz; 10%SCA - subcarrier ( fs = 67kHz, unmodulated ).
α 67
=
----^V----^O----⁽--^s---ⁱ-^g----ⁿ---^a---^l-⁾--⁽--^a---^t--¹---^k---^H----^z---⁾---
V_{O( spu r iou s) ( a t 9k H z)}
;
F_s
=(2
x
38kHz)
-
67kHz
4. ACI ( Adjacent Channel Interference ):
α 114
=
----^V----^O----⁽--^s---ⁱ-^g---ⁿ---^a----^l-⁾--⁽--^a---^t--¹---^k---^H----^z--⁾----
V_{O(spurious)(at4kHz)}
;
F_s
=
110kHz
-
(3
x
38kHz)
α 114
=
----^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).
NOISE BLANKER PART
Features:
– internal 2nd order 140kHz high-pass filter
– programmable trigger threshold
– trigger threshold dependent on high frequency noise with programmable gain
– additional circuits for deviation- and fieldstrength-dependent trigger adjustment
– very low offset current during hold time due to opamps with MOS inputs
– 4 selectable pulse suppression times
– programmable noise rectifier charge/discharge current
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
Test Condition
V_{TR Trigger Threshold} ^{0) 1)}
meas. with V_PEAK = 0.9V
NBT = 111
NBT = 110
NBT = 101
NBT = 100
NBT = 011
NBT = 010
NBT = 001
NBT = 000
V_TRNOISE Noise Controlled Trigger
Threshold ²⁾
meas. with V_PEAK = 1.5V
NCT = 00
NCT = 01
NCT = 10
NCT = 11
V_RECT Rectifier Voltage
V_MPX = 0mV
NRD ⁶⁾ = 00
V_MPX = 50mV; f = 150KHz
V_MPX = 200mV; f = 150KHz
Min.
(c)
(c)
(c)
(c)
(c)
(c)
(c)
(c)
(c)
(c)
(c)
(c)
0.5
1.5
Typ.
30
35
40
45
50
55
60
65
260
220
180
140
0.9
1.7
3.5
Max.
(c)
(c)
(c)
(c)
(c)
(c)
(c)
(c)
(c)
(c)
(c)
(c)
1.3
2.1
Unit
mV_OP
mV_OP
mV_OP
mV_OP
mV_OP
mV_OP
mV_OP
mV_OP
mV_OP
mV_OP
mV_OP
mV_OP
V
V
V
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