TDA1581T Philips Semiconductors, TDA1581T Datasheet - Page 7

• Manufacturer Part Number: TDA1581T
• Description: Decoder for traffic warning VWF radio transmissions
• Manufacturer: Philips Semiconductors

Philips Semiconductors
APPLICATION INFORMATION (see Fig.3)
Notes to the application information
1. Sequence for measuring switch-on delay times (t
2. Sequence for measuring switch-off delay times (t
March 1992
V
m
t
t
V
m
t
t
---------------- -
m
-----------------
m
m
m
dSKon
dSKoff
dDKon
dDKoff
iSKon
iDKon
Decoder for traffic warning (VWF) radio
transmissions
BKon
DKon
BKoff
DKoff
BKon
DKon
a) Nominal BK or DK input signal at pin 15: V
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
c) t
a) Nominal operating conditions as in note 1.
b) t
SYMBOL
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 18) 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 15 (DK at pin 2).
ends when the negative-going edge of the SK output arrives at pin 3 (DK at pin 2).
oDK
SK switch-on threshold level
SK switch-on threshold level
SK switch hysteresis
SK switch-on delay
SK switch-off delay
DK switch-on threshold level
DK switch-on threshold level
DK switch hysteresis
DK switch-on delay
DK switch-off delay
signal at pin 17) crosses zero.
PARAMETER
i(p-p)
don
doff
= 8 mV; f = 57 kHz; modulation-on.
m
V
note 1
note 2
m
V
note 1
note 2
)
)
iSK
iDK
BK
DK
7
CONDITIONS
= 60 %
= 8 mV
= 30 %
= 8 mV
oBK
3.0
380
3.1
600
MIN.
signal at pin 5 (V
1.8
32
3.5
95
500
1.5
13
3.6
750
750
TYP.
Preliminary specification
oDK
4.0
200
700
4.1
1000
1000
MAX.
TDA1581T
signal at pin 17)
oBK
mV
%
dB
ms
ms
mV
%
dB
ms
ms
UNIT
signal at