Philips Semiconductors
Decoder for traffic warning (VWF) radio
transmissions
Product specification
TDA1579
TDA1579T
PARAMETER
Internal reference voltage
Output voltage
(typ. value = 0.5 VP)
Internal resistance of
voltage source
Available output current
Output short-circuit current
(typ. value = VP/1 kΩ)
Reference current source
Reference voltage
(typ. value = V8-18−VBE)
Internal biasing resistor
Allowable range of external
reference resistor
* Selectable by R12-8 or Z10-8.
CONDITIONS
SYMBOL
MIN.
TYP. MAX. UNIT
V8-18
4.0
4.25
4.5
V
R8
−I8
+I8
−I8sc
−
−
5
Ω
2
−
−
mA
0.6
−
−
mA
−
8
−
mA
V17-18
Ri17
R17-18
−
3.6
−
5
180
−
−
V
−
kΩ
270
kΩ
May 1992
5