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TDA7407 Datasheet(PDF) 17 Page - STMicroelectronics

No. de pieza TDA7407
Descripción Electrónicos  Advanced car signal processor
PDF  46 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7407 Datasheet(HTML) 17 Page - STMicroelectronics

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TDA7407
Noise blanker part
17/46
4
Noise blanker part
●
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 wMOS inputs
●
four selectable pulse suppression times
●
programmable noise rectifier charge/discharge current
Table 7.
Noise blanker electrical characteristics
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
VTR
Trigger threshold (1) (2)
meas. with VPEAK
= 0.9V
NBT = 111
(10)
30
(10)
mVOP
NBT = 110
(10)
35
(10)
mVOP
NBT = 101
(10)
40
(10)
mVOP
NBT = 100
(10)
45
(10)
mVOP
NBT = 011
(10)
50
(10)
mVOP
NBT = 010
(10)
55
(10)
mVOP
NBT = 001
(10)
60
(10)
mVOP
NBT = 000
(10)
65
(10)
mVOP
VTRNOISE
Noise controlled
trigger threshold (3)
meas. with VPEAK
= 1.5V
NCT = 00
(10)
260
(10)
mVOP
NCT = 01
(10)
220
(10)
mVOP
NCT = 10
(10)
180
(10)
mVOP
NCT = 11
(10)
140
(10)
mVOP
VRECT
Rectifier voltage
VMPX = 0mV
NRD (7) = 00
0.5
0.9
1.3
V
VMPX = 50mV; f = 150KHz
1.5
1.7
2.1
V
VMPX = 200mV; f = 150KHz
2.2
2.5
2.9
V
VRECT DEV
Deviation dependent
rectifier voltage (4)
means. with
VMPX = 800mV
(75KHz dev.)
OVD = 11
0.5
0.9(off)
1.3
VOP
OVD = 10
0.9
1.2
1.5
VOP
OVD = 01
1.7
2.0
2.3
VOP
OVD = 00
2.5
2.8
3.1
VOP
VRECT FS
Fieldstrength
controlled rectifier
voltage (5)
means. with
VMPX = 0mV
VLEVEL << VSBL
(fully mono)
FSC = 11
0.5
0.9(off)
1.3
V
FSC = 10
0.9
1.4
1.5
V
FSC = 01
1.7
1.9
2.3
V
FSC = 00
2.1
2.4
3.1
V



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