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TDA7402 数据表(PDF) 28 Page - STMicroelectronics

部件名 TDA7402
功能描述  CARRADIO SIGNAL PROCESSOR
PDF  59 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TDA7402 数据表(HTML) 28 Page - STMicroelectronics

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2.3.4 ACI ( Adjacent Channel Interference )
measured with: 90% mono signal; 9% pilot signal; fm=1kHz; 1% spurious signal ( fS = 110kHz or 186kHz, un-
modulated).
2.4 NOISE BLANKER PART
2.4.1 Features:
s
AM and FM mode
s
internal 2nd order 140kHz high-pass filter for MPX path
s
internal rectifier and filters for AM-IF path
s
programmable trigger thresholds
s
trigger threshold dependent on high frequency noise with programmable gain
s
additional circuits for deviation- and fieldstrength-dependent trigger adjustment
s
4 selectable pulse suppression times for each mode
s
programmable noise rectifier charge/discharge current
2.4.2 ELECTRICAL CHARACTERISTICS
All parameters measured in FM mode if not otherwise specified.
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
VTR
Trigger Threshold 1)
meas.with
VPEAK=0.9V
111
30
mVOP
110
35
mV
OP
101
40
mV
OP
100
45
mVOP
011
50
mVOP
010
55
mVOP
001
60
mVOP
000
65
mVOP
VTRNOISE
noise controlled
Trigger Threshold
meas.with
VPEAK=1.5V
00
260
mVOP
01
220
mV
OP
10
180
mVOP
11
140
mVOP
VRECT
Rectifier Voltage
VMPX=0mV
0.9
V
VMPX=50mV, f=150kHz
1.7
V
VMPX=200mV, f=150kHz
3.5
V
α114
V
O s ignal
() at1kHz
()
V
O s pur iou s
() at4kHz
()
--------------------------------------------------------------- -f
s
;
110k Hz
3 38kH z
⋅
()
–
==
α190
V
O s ignal
() at1kHz
()
V
O s pur iou s
() at4kHz
()
--------------------------------------------------------------- -f
s
;
186k Hz
5 38kH z
⋅
()
–
==



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