參數(shù)資料
型號： TDA7405TR
廠商： STMICROELECTRONICS
元件分類： 消費家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP44
封裝： 10 X 10 MM, ROHS COMPLIANT, TQFP-44
文件頁數(shù)： 19/58頁
文件大?。?/td> 762K
代理商： TDA7405TR
TDA7405
26/57
Note 4. ACI ( Adjacent Channel Interference )
measured with: 90% mono signal; 9% pilot signal; fm=1kHz; 1% spurious signal (fs = 110kHz or 186kHz, un-
modulated).
8
NOISE BLANKER PART
8.1 Features:
■
AM and FM mode
■
internal 2nd order 140kHz high-pass filter for MPX path
■
internal rectifier and filters for AM-IF path
■
programmable trigger thresholds
■
trigger threshold dependent on high frequency noise with programmable gain
■
additional circuits for deviation- and fieldstrength-dependent trigger adjustment
■
4 selectable pulse suppression times for each mode
■
programmable noise rectifier charge/discharge current
Table 8. ELECTRICAL CHARACTERISTICS
All parameters mesured in FM mode if not otherwise specified.
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VTR
Trigger Threshold 5)
meas.with
VPEAK=0.9V
111
30
mVOP
110
35
mVOP
101
40
mVOP
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
mVOP
10
180
mVOP
11
140
mVOP
α114
V
o s ign al
() at1kHz
()
V
o sp u r io u s
() at4kHz
()
----------------------------------------------------------------
s
;
110kH z
3 38 kHz
()
–
==
α190
V
o s ign al
() at1kHz
()
V
o sp u r io u s
() at4kHz
()
----------------------------------------------------------------
s
;
186kH z
5 38 kHz
()
–
==
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