TDA1579 Philips Semiconductors, TDA1579 Datasheet - Page 6

• Manufacturer Part Number: TDA1579
• Description: Decoder for traffic warning VWF radio transmissions
• Manufacturer: Philips Semiconductors

Philips Semiconductors
APPLICATION INFORMATION (Fig.1)
Notes
1. Sequence for measuring switch-on delay times (t
2. Sequence for measuring switch-off delay times (t
May 1992
SK switch-on threshold
SK switch-on threshold
SK switch hysteresis
SK switch-on delay
SK switch-off delay
DK switch-on threshold
DK switch-on threshold
DK switch hysteresis
DK switch-on delay
DK switch-off delay
Decoder for traffic warning (VWF) radio
transmissions
level at m
level at V
(note 1)
(note 2)
level at m
level at V
(note 1)
(note 2)
a) Nominal BK or DK input signal at pin 13: V
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
c) t
a) Nominal operating conditions as in note 1.
b) t
at pin 3 (DK output at pin 2).
pin 5 (V
t
crosses zero.
t
don
don
doff
doff
commences when the ground connection is removed from pin 4 (pin 16) as the positive-going V
commences when the input is switched off as the negative-going V
ends when the positive-going edge of the SK output arrives at pin 13 (DK at pin 2).
ends when the negative-going edge of the SK output arrives at pin 3 (DK at pin 2).
iSK
iDK
BK
DK
PARAMETER
oDK
= 60%
= 8 mV
= 30%
= 8 mV
signal at pin 15) crosses zero.
V
m
t
t
V
m
t
t
m
---------------- -
m
m
---------------- -
m
dSKon
dSKoff
dDKon
dDKoff
iSKon
iDKon
BKon
DKon
BKoff
DKon
BKon
Dkoff
SYMBOL
i(p-p)
= 8 mV; f = 57 kHz; modulation-on.
don
doff
6
)
)
typ.
typ.
>
typ.
<
typ.
<
>
typ.
<
typ.
typ.
>
typ.
<
typ.
<
>
typ.
<
oBK
1.8
32
3.0
3.5
4.0
95
130
380
500
620
1.5
13
3.1
3.6
4.1
750
1000
600
750
1000
signal at pin 5 (V
APPLICATION
Product specification
oDK
TDA1579T
TDA1579
signal at pin 15)
oBK
mV
%
dB
dB
dB
ms
ms
ms
ms
ms
mV
%
dB
dB
dB
ms
ms
ms
ms
ms
signal at
UNIT