TDA7405 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TDA7405' PDF : 56 Pages View PDF
TDA7405
Note 4. ACI ( Adjacent Channel Interference )
α114 = -V----Vo---(-o--s-(--ps----ui--g--r-n-i--o-a---u-l--)s--(--)-a-(---ta--1-t---k4---Hk----H-z---)-z---) ;ƒs = 110kH z – (3 ⋅ 38 kHz )
α190 = -V----Vo---(-o--s-(--ps----ui--g--r-n-i--o-a---u-l--)s--(--)-a-(---ta--1-t---k4---Hk----H-z---)-z---) ;ƒs = 186kH z – (5 ⋅ 38 kHz )
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
VTR Trigger Threshold 5)
meas.with
111
VPEAK=0.9V
110
101
100
011
010
001
000
VTRNOISE noise controlled
Trigger Threshold
meas.with
00
VPEAK=1.5V
01
10
11
Min.
Typ.
30
35
40
45
50
55
60
65
260
220
180
140
Max.
Unit
mVOP
mVOP
mVOP
mVOP
mVOP
mVOP
mVOP
mVOP
mVOP
mVOP
mVOP
mVOP
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