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TDA7420 Datasheet(PDF) 9 Page - STMicroelectronics

Part # TDA7420
Description  MULTIFUNCTIONAUDIO PROCESSOR
PDF  29 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7420 Datasheet(HTML) 9 Page - STMicroelectronics

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ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
VTRMIN
Trigger Threshold (*)
1) minimum
Measured with
NBT = 000
VPEAK = 1.2V
D2 on byte 2 = 1
D2 on byte 2 = 0
100
150
30
200
mVp
VTRMIN
Trigger Threshold
1) maximum
Measured with
NBT = 111
VPEAK = 1.2V
D2 on byte 2 = 1
D2 on byte 2 = 0
130
185
65
250
mVp
VTRSTEP
Trigger Threshold Step Size
5
mVp
VTRNOISE
Noise Adjusted Trigger Threshold
2)
Measured with
VPEAK = 1.4V
D2 on byte 2 = 0
NAT = 00
NAT = 01
NAT = 10
NAT = 11
140
180
240
280
mVp
mVp
mVp
mVp
VPEAK
Rectifier Voltage
D2 on byte 2 = 1
VMPX = 0mV
0.9
V
VMPX = 50mV
f = 200KHz
1.5
V
VMPX = 100mV
f = 200KHz
2.0
V
VRECTDEV
Deviation Dependent Rectifier
Voltage
3)
Measured with
VMPX = 500mV
(75KHz dev.)
OVD = 00(off)
OVD = 01
OVD = 10
OVD = 11
0.9
1.2
2.0
2.8
V
V
V
V
VRECTFS
Field Strength Controlled Rectifier
Voltage
4)
Measured with
VMPX = 0mV
VSB-VR = -500mV
(fully mono.)
FSC = 00(off)
FSC = 01
FSC = 10
FSC = 11
0.9
1.3
1.9
2.4
V
V
V
V
TS
Suppression Pulse Duration
CBLANK = 330pF
40
µs
IOS
Input Offset Current During
Suppression Time
10
pA
(*) All thresholds are measured by using a pulse with TR =2
µs, THIGH =2µs and TF =10µs.
The repetition rate must not increase the PEAK voltage.
1) NTB represents bits D0 - D2 of NB byte 1
2) NAT represents bits D3 - D4 of NB byte 1
3) OVD represents bits D5 - D6 of NB byte 1
4) FSC represents bits D0 - D1 of NB byte 2
NOISE BLANKER PART
FEATURES:
INTERNAL 2nd ORDER 140KHz HIGH-PASS
FILTER
NOISE RECTIFIER OUTPUT FOR SIGNAL
QUALITY DETECTION
PROGRAMMABLE TRIGGER THRESHOLD
TRIGGER THRESHOLD DEPENDENT ON
HIGH
FREQUENCY
NOISE WITH
PRO-
GRAMMABLE GAIN
ADDITIONAL CIRCUITS FOR DEVIATION
AND FIELD STRENGTH -DEPENDENT TRIG-
GER ADJUSTMENT
BLANKING TIME PROGRAMMABLE BY EX-
TERNAL CAPACITOR
VERY LOW OFFSET CURRENT DURING
HOLD TIME DUE TO OPAMPS WITH MOS
INPUTS
VTH
VMPX
DC-LEVEL
TR
THIGH
TF
Time
D94AU185
TDA7420
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