TDA7461N Datasheet, PDF (14/31 Pages) STMicroelectronics – CAR RADIO SIGNAL PROCESSOR

TDA7461N
NOISE BLANKER PART
internal 2nd order 140kHz high pass filter
programmable trigger threshold
additional circuits for trigger adjustment (devia-
tion, field-strenght)
very low offset current during hold time
four selectable pulse suppression times
ELECTRICAL CHARACTERISTICS (continued)
Symbol
VTR
VTRNOISE
VRECT
VRECT DEV
VRECT FS
Parameter
Trigger Threshold ^{0) 1)}
Noise Controlled Trigger
Threshold ²⁾
Rectifier Voltage
deviation dependent
rectifier Voltage ³⁾
Fieldstrength Controlled
Rectifier Voltage ⁴⁾
Test Condition
meas. with VPEAK = 0.9V NBT = 111
NBT = 110
NBT = 101
NBT = 100
NBT = 011
NBT = 010
NBT = 001
NBT = 000
meas. with VPEAK = 1.5V NCT = 00
NCT = 01
NCT = 10
NCT = 11
VMPX = 0mV
VMPX = 50mV; f = 150KHz
VMPX = 100mV; f = 150KHz
means. with
VMPX = 800mV
(75KHz dev.)
OVD = 11
OVD = 10
OVD = 01
OVD = 00
means. with
VMPX = 0mV
VLEVEL << VSBL
(fully mono)
FSC = 11
FSC = 10
FSC = 01
FSC = 00
Min.
0.5
1.5
2.2
0.5
0.9
1.7
2.5
0.5
1.0
1.5
2.0
0) All thresholds are measured using a pulse with TR = 2 µs, THIGH = 2 µs and TF = 10 µs.
1) NBT represents the Noiseblanker-Byte bits D2; D0 for the noise blanker trigger threshold
2) NAT represents the Noiseblanker-Byte bit pair D4,D3 for the noise controlled trigger adjustment
3) OVD represents the Noiseblanker-Byte bit pair D7,D6 for the over deviation detector
4) FSC represents the Fieldstrength-Byte bit pair D1,D0 for the fieldstrength control
Typ.
30
35
40
45
50
55
60
65
260
220
180
140
0.9
1.7
2.5
0.9(off)
1.2
2.0
2.8
0.9(off)
1.3
1.8
2.3
Max.
1.3
2.1
2.9
1.3
1.5
2.3
3.1
1.3
1.6
2.1
2.6
Unit
mVOP
mVOP
mVOP
mVOP
mVOP
mVOP
mVOP
mVOP
mVOP
mVOP
mVOP
mVOP
V
V
V
VOP
VOP
VOP
VOP
V
V
V
V
VIN
VOP
DC
14/31
D97AU636
TR THIGH
TF
Time