TDA1579 Ver la hoja de datos (PDF) - Philips Electronics
Número de pieza
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Fabricante
TDA1579 Datasheet PDF : 13 Pages
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Philips Semiconductors
Decoder for traffic warning (VWF) radio
transmissions
Product specification
TDA1579
TDA1579T
APPLICATION INFORMATION (Fig.1)
PARAMETER
SK switch-on threshold
level at mBK = 60%
SK switch-on threshold
level at ViSK = 8 mV
SK switch hysteresis
SYMBOL
ViSKon
typ.
mBKon
typ.
>
m-m-----BB---KK---o-o--fn--f
typ.
<
APPLICATION
1.8
32
3.0
3.5
4.0
UNIT
mV
%
dB
dB
dB
SK switch-on delay
typ.
95
ms
(note 1)
tdSKon
<
130
ms
SK switch-off delay
>
380
ms
(note 2)
tdSKoff
typ.
500
ms
<
620
ms
DK switch-on threshold
level at mDK = 30%
ViDKon
typ.
1.5
mV
DK switch-on threshold
level at ViDK = 8 mV
mDKon
typ.
13
%
>
3.1
dB
DK switch hysteresis
m-m-----DD---Kk---o-o--fn-f
typ.
3.6
<
4.1
dB
dB
DK switch-on delay
(note 1)
DK switch-off delay
(note 2)
typ.
750
ms
tdDKon
<
1000
ms
>
600
ms
tdDKoff
typ.
750
ms
<
1000
ms
Notes
1. Sequence for measuring switch-on delay times (tdon)
a) Nominal BK or DK input signal at pin 13: Vi(p-p) = 8 mV; f = 57 kHz; modulation-on.
b) Pin 4 of the BK detector (pin 16 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 16) as the positive-going VoBK signal at
pin 5 (VoDK signal at pin 15) crosses zero.
tdon ends when the positive-going edge of the SK output arrives at pin 13 (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 15)
crosses zero.
tdoff ends when the negative-going edge of the SK output arrives at pin 3 (DK at pin 2).
May 1992
6
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