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TDA1581 Datasheet(PDF) 7 Page - NXP Semiconductors

No. de pieza TDA1581
Descripción Electrónicos  Decoder for traffic warning VWF radio transmissions
Download  14 Pages
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Fabricante Electrónico  PHILIPS [NXP Semiconductors]
Página de inicio  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA1581 Datasheet(HTML) 7 Page - NXP Semiconductors

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March 1992
7
Philips Semiconductors
Preliminary specification
Decoder for traffic warning (VWF) radio
transmissions
TDA1581T
APPLICATION INFORMATION (see Fig.3)
Notes to the application information
1. Sequence for measuring switch-on delay times (tdon)
a) Nominal BK or DK input signal at pin 15: Vi(p-p)= 8 mV; f = 57 kHz; modulation-on.
b) Pin 4 of the BK detector (pin 18 of the DK detector) is switched to ground to cause a low signal at the SK output
at pin 3 (DK output at pin 2).
c) tdon commences when the ground connection is removed from pin 4 (pin 18) as the positive-going VoBK signal at
pin 5 (VoDK signal at pin 17) crosses zero.
tdon ends when the positive-going edge of the SK output arrives at pin 15 (DK at pin 2).
2. Sequence for measuring switch-off delay times (tdoff)
a) Nominal operating conditions as in note 1.
b) tdoff commences when the input is switched off as the negative-going VoBK signal at pin 5 (VoDK signal at pin 17)
crosses zero.
tdoff ends when the negative-going edge of the SK output arrives at pin 3 (DK at pin 2).
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
ViSKon
SK switch-on threshold level
mBK = 60 %
1.8
mV
mBKon
SK switch-on threshold level
ViSK = 8 mV
32
%
SK switch hysteresis
3.0
3.5
4.0
dB
tdSKon
SK switch-on delay
note 1
95
200
ms
tdSKoff
SK switch-off delay
note 2
380
500
700
ms
ViDKon
DK switch-on threshold level
mDK = 30 %
1.5
mV
mDKon
DK switch-on threshold level
ViDK = 8 mV
13
%
DK switch hysteresis
3.1
3.6
4.1
dB
tdDKon
DK switch-on delay
note 1
750
1000
ms
tdDKoff
DK switch-off delay
note 2
600
750
1000
ms
m
BKon
m
BKoff
-----------------
m
DKon
m
DKoff
-----------------


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