E-TDA7461ND View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'E-TDA7461ND' PDF : 48 Pages View PDF
TDA7461
Stereo decoder part
4.3
Noise blanker part
● internal 2nd order 140 kHz high pass filter
● programmable trigger threshold
● additional circuits for trigger adjustment (deviation, field-strength)
● very low offset current during hold time
● four selectable pulse suppression times
Table 9. Noise blanker electrical characteristics
Symbol
Parameter
Test condition
Min. Typ.
NBT = 111
30
NBT = 110
35
NBT = 101
40
NBT = 100
45
VTR
Trigger threshold (1), (2) meas. with VPEAK = 0.9V
NBT = 011
50
NBT = 010
55
NBT = 001
60
NBT = 000
65
NCT = 00
260
VTRNOISE
Noise Controlled
Trigger Threshold(3)
NCT = 01
meas. with VPEAK = 1.5V
NCT = 10
220
180
NCT = 11
140
VMPX = 0mV
0.5
0.9
VRECT Rectifier Voltage
VMPX = 50mV; f = 150KHz
1.5
1.7
VMPX = 100mV; f = 150KHz
2.2
2.5
OVD = 11 0.5 0.9(off)
VRECT DEV
Deviation dependent(4)
rectifier voltage
means. with
VMPX = 800mV
(75KHz dev.)
OVD = 10 0.9
1.2
OVD = 01 1.7
2.0
OVD = 00 2.5
2.8
VRECT FS
Fieldstrength
controlled (5)
rectifier voltage
means. with
VMPX = 0mV
VLEVEL << VSBL
(fully mono)
FSC = 11 0.5 0.9(off)
FSC = 10 1.0
1.3
FSC = 01 1.5
1.8
FSC = 00 2.0
2.3
1. All thresholds are measured using a pulse with TR = 2 μs, THIGH = 2 μs and TF = 10 μs.
2. NBT represents the Noise blanker-Byte bits D2; D0 for the noise blanker trigger threshold
3. NAT represents the Noise blanker-Byte bit pair D4,D3 for the noise controlled trigger adjustment
4. OVD represents the Noise blanker-Byte bit pair D7,D6 for the over deviation detector
5. FSC represents the Fieldstrength-Byte bit pair D1,D0 for the fieldstrength control
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
mVOP
mVOP
mVOP
mVOP
V
V
V
V
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