TDA1579T
Table of contents
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DATA SH EET
Product specification
File under Integrated Circuits, IC01
May 1992
INTEGRATED CIRCUITS
TDA1579
TDA1579T
Decoder for traffic warning (VWF)
radio transmissions
May 1992 2
Philips Semiconductors Product specification
Decoder for traffic warning (VWF) radio
transmissions
TDA1579
TDA1579T
GENERAL DESCRIPTION
The TDA1579 decoder is for radio transmissions having
57 kHz amplitude-modulated subcarriers as used in the
German 'Verkehrs Warnfunk' (VWF) traffic warning
system.
Features
• Selective subcarrier amplifier (57 kHz) with gain control
• Transmitter identification signal (SK) decoder
• Area identification signal (BK) and announcement
identification signal (DK) active filtering
• BK and DK decoders (Schmitt trigger with switched
hysteresis)
• BK and DK switch-on/switch-off delay circuits
• Driver output for SK indicator (LED)
• SK and BK control outputs.
QUICK REFERENCE DATA
Measured in Fig.1 at V
iSK
= 8 mV; f = 57 kHz amplitude modulated with f
m
= 34.95 Hz and m = 60% for
‘BK-traffic area C’ signal; or with f
m
= 125 Hz and m = 30% for DK signal.
PACKAGE OUTLINES
TDA1579: 18-lead DIL; plastic (SOT102); SOT102-1; 1996 August 12.
TDA1579T: 20-lead mini-pack; plastic (SO20; SOT163A); SOT163-1; 1996 August 12.
PARAMETER CONDITIONS SYMBOL MIN. TYP. MAX. UNIT
Supply voltage V
P
7.5 8.5 12 V
Supply current I
P
− 6 − mA
Nominal input voltage at f = 57 kHz V
iSK
− 8 − mV
Input impedance at f ≤ 57 kHz Z
i
100 −−kΩ
Control level −3 dB V
iSK
− 2.4 − mV
Input voltage peak-to-peak value V
i(p-p)
2 −−V
SK switch-on
threshold level m
BKon
− 42 − %
SK switch hysteresis ∆m
BK
− 3.5 − dB
SK switch-on delay t
dSKon
− 150 − ms
SK switch-off delay t
dSKoff
− 750 − ms
DK switch-on
threshold level m
DKon
− 13 − %
DK switch hysteresis ∆m
DK
− 3.6 − dB
DK switch-on delay t
dDKon
− 750 − ms
DK switch-off delay t
dDKoff
− 750 − ms
Ambient operating
temperature range T
amb
−30 −+ 80 °C
May 1992 3
Philips Semiconductors Product specification
Decoder for traffic warning (VWF) radio
transmissions
TDA1579
TDA1579T
RATINGS
Limiting values in accordance with the Absolute Maximum System (IEC 134). All pin numbers in this table apply to
TDA1579; for TDA1579T refer to Fig.1.
CHARACTERISTICS
V
P
= 8.5 V; T
amb
= 25 °C; measured at nominal input signal: V
iSK
= 8 mV, f = 57 kHz amplitude modulated with
f
m
= 34.95 Hz and m = 60% for ‘BK-traffic area C’ signal; or with f
m
= 125 Hz and m = 30% for DK signal.
All pin numbers in this table apply to TDA1579, for TDA1579T refer to Fig.1.
PARAMETER CONDITIONS SYMBOL MIN. TYP. MAX. UNIT
Supply voltage pin 7 V
P
= V
7-18
−−15 V
Switch output voltage pin 1 V
1-18
−−23 V
pins 2 or 3 V
2; 3-18
−−15 V
pins 1, 2 or 3 −V
1; 2; 3-18
−−0.5 V
Switch output current pin 1 I
1
−−50 mA
pins 2 or 3 I
2; 3
−−5mA
pins 1, 2 or 3 −I
1; 2; 3
−−10 mA
Signal input voltage pin 13 V
13-18
−−V
P
pin 13 −V
13-18
−−0.5 V
Signal input current pin 13 −I
13
−−10 mA
Total power dissipation P
tot
−−800 mW
Storage temperature
range T
stg
−55 −+150 °C
Operating ambient
temperature range T
amb
−30 −+80 °C
PARAMETER CONDITIONS SYMBOL MIN. TYP. MAX. UNIT
Supply voltage pin 7 V
P
7.5 − 12 V
Supply current pin 7 I
P
− 610mA
SK amplifier/decoder
Input impedance f ≤ 57 kHz |Z
i
| 100 −−kΩ
Input voltage (peak-to-
peak value) V
i(p-p)
2 −−V
Input voltage at start of
gain control V
o9BK
= −3 dB V
iSK
− 2.4* − mV
Voltage gain V
9BK
/V
13SK
G
v9-13
− 44* − dB
Gain spread ± ∆ G
v9-13
−−2dB
Gain control range ∆G
v
40 −−dB
Controlled output voltage V
o9BK
− 440 − mV
V
o9DK
− 220 − mV
May 1992 4
Philips Semiconductors Product specification
Decoder for traffic warning (VWF) radio
transmissions
TDA1579
TDA1579T
BK circuit
Switch-on threshold level pin 3 high-Z V
o5BKon
600 670 750 mV
Switch hysteresis 3 3.5 4 dB
BK switch threshold level
for BK-off (SK-off) pin 3
conducting V
4-18off
0.8 0.88 0.97 V
(typ. value = 0.21V
8-18
)
SK output (pin 3)
allowable load current I
3
−−1.5 mA
saturation voltage I
3
= 1.5 mA V
3-18sat
−−0.35 V
rejection voltage I
3
< 5 µAV
3-18
18 −−V
Indicator driver (pin 1)
allowable load current I
1
−−40 mA
saturation voltage I
1
= 20 mA V
1-18sat
−−0.8 V
rejection voltage I
1
< 10 µAV
1-18
23 −−V
DK circuit
Switch-on threshold level pin 2 high-Z V
15DKon
600 670 750 mV
Switch hysteresis 3.1 3.6 4.1 dB
DK switch threshold level
for DK-off (Schmitt pin 2
trigger output) conducting V
16-18off
− 0.6 − V
(typ. value 1 × V
BE
)
DK output (pin 2)
allowable load current I
2
−−1.5 mA
saturation voltage I
2
= 1.5 mA V
2-18sat
−−0.35 V
rejection voltage I
2
< 5 µAV
2-18
18 −−V
BK and DK filter amplifiers
Open loop gain f = 100 Hz G
o
84 −−dB
Current gain G
i
120 −−dB
Input bias current ± I
i
−−50 nA
Output offset voltage R
5-6
= R
14-15
= 680 kΩ± V
o5-8
−−50 mV
± V
15-8
Available output current ± I
o
1 −−mA
Output resistance R
o
− 2 3.5 kΩ
Allowable load
capacitance C
L
−−50 pF
PARAMETER CONDITIONS SYMBOL MIN. TYP. MAX. UNIT
V
o5BKon
V
o5BKoff
--------------------- -
V
15DKon
V
15DKoff
--------------------- -
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