INTEGRATED CIRCUITS
TDA1579
TDA1579T
Decoder for traffic warning (VWF) radio transmissions
Product specification |
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May 1992 |
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File under Integrated Circuits, IC01 |
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Philips Semiconductors |
Product specification |
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Decoder for traffic warning (VWF) radio |
TDA1579 |
transmissions |
TDA1579T |
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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.
QUICK REFERENCE DATA
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.
Measured in Fig.1 at ViSK = 8 mV; f = 57 kHz amplitude modulated with fm = 34.95 Hz and m = 60% for ‘BK-traffic area C’ signal; or with fm = 125 Hz and m = 30% for DK signal.
PARAMETER |
CONDITIONS |
SYMBOL |
MIN. |
TYP. |
MAX. |
UNIT |
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Supply voltage |
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VP |
7.5 |
8.5 |
12 |
V |
Supply current |
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IP |
- |
6 |
- |
mA |
Nominal input voltage |
at f = 57 kHz |
ViSK |
- |
8 |
- |
mV |
Input impedance |
at f £ 57 kHz |
ïZiï |
100 |
- |
- |
kW |
Control level |
-3 dB |
ViSK |
- |
2.4 |
- |
mV |
Input voltage |
peak-to-peak value |
Vi(p-p) |
2 |
- |
- |
V |
SK switch-on |
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threshold level |
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mBKon |
- |
42 |
- |
% |
SK switch hysteresis |
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DmBK |
- |
3.5 |
- |
dB |
SK switch-on delay |
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tdSKon |
- |
150 |
- |
ms |
SK switch-off delay |
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tdSKoff |
- |
750 |
- |
ms |
DK switch-on |
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threshold level |
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mDKon |
- |
13 |
- |
% |
DK switch hysteresis |
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DmDK |
- |
3.6 |
- |
dB |
DK switch-on delay |
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tdDKon |
- |
750 |
- |
ms |
DK switch-off delay |
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tdDKoff |
- |
750 |
- |
ms |
Ambient operating |
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temperature range |
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Tamb |
-30 |
- |
+ 80 |
°C |
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.
May 1992 |
2 |
Philips Semiconductors |
Product specification |
|
|
Decoder for traffic warning (VWF) radio |
TDA1579 |
transmissions |
TDA1579T |
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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.
PARAMETER |
CONDITIONS |
SYMBOL |
MIN. |
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TYP. |
MAX. |
UNIT |
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Supply voltage |
pin 7 |
VP = V7-18 |
− |
− |
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15 |
V |
Switch output voltage |
pin 1 |
V1-18 |
− |
− |
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23 |
V |
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pins 2 or 3 |
V2; 3-18 |
− |
− |
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15 |
V |
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pins 1, 2 or 3 |
−V1; 2; 3-18 |
− |
− |
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0.5 |
V |
Switch output current |
pin 1 |
I1 |
− |
− |
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50 |
mA |
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pins 2 or 3 |
I2; 3 |
− |
− |
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5 |
mA |
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pins 1, 2 or 3 |
−I1; 2; 3 |
− |
− |
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10 |
mA |
Signal input voltage |
pin 13 |
V13-18 |
− |
− |
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VP |
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pin 13 |
−V13-18 |
− |
− |
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0.5 |
V |
Signal input current |
pin 13 |
−I13 |
− |
− |
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10 |
mA |
Total power dissipation |
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Ptot |
− |
− |
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800 |
mW |
Storage temperature |
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range |
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Tstg |
−55 |
− |
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+150 |
°C |
Operating ambient |
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temperature range |
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Tamb |
−30 |
− |
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+ 80 |
°C |
CHARACTERISTICS
VP = 8.5 V; Tamb = 25 °C; measured at nominal input signal: ViSK = 8 mV, f = 57 kHz amplitude modulated with fm = 34.95 Hz and m = 60% for ‘BK-traffic area C’ signal; or with fm = 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 |
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Supply voltage |
pin 7 |
VP |
7.5 |
− |
12 |
V |
Supply current |
pin 7 |
IP |
− |
6 |
10 |
mA |
SK amplifier/decoder |
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Input impedance |
f ≤ 57 kHz |
|Zi| |
100 |
− |
− |
kΩ |
Input voltage (peak-to- |
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peak value) |
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Vi(p-p) |
2 |
− |
− |
V |
Input voltage at start of |
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gain control |
Vo9BK = −3 dB |
ViSK |
− |
2.4* |
− |
mV |
Voltage gain |
V9BK/V13SK |
Gv9-13 |
− |
44* |
− |
dB |
Gain spread |
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± Gv9-13 |
− |
− |
2 |
dB |
Gain control range |
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Gv |
40 |
− |
− |
dB |
Controlled output voltage |
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Vo9BK |
− |
440 |
− |
mV |
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Vo9DK |
− |
220 |
− |
mV |
May 1992 |
3 |
Philips Semiconductors Product specification
Decoder for traffic warning (VWF) radio |
|
|
TDA1579 |
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transmissions |
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TDA1579T |
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PARAMETER |
CONDITIONS |
SYMBOL |
MIN. |
TYP. |
MAX. |
UNIT |
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BK circuit |
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Switch-on threshold level |
pin 3 high-Z |
Vo5BKon |
600 |
670 |
750 |
mV |
Switch hysteresis |
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Vo5BKon |
3 |
3.5 |
4 |
dB |
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--------------------- |
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Vo5BKoff |
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BK switch threshold level |
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for BK-off (SK-off) |
pin 3 |
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conducting |
V4-18off |
0.8 |
0.88 |
0.97 |
V |
(typ. value = 0.21V8-18) |
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SK output (pin 3) |
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allowable load current |
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I3 |
− |
− |
1.5 |
mA |
saturation voltage |
I3 = 1.5 mA |
V3-18sat |
− |
− |
0.35 |
V |
rejection voltage |
I3 < 5 μA |
V3-18 |
18 |
− |
− |
V |
Indicator driver (pin 1) |
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allowable load current |
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I1 |
− |
− |
40 |
mA |
saturation voltage |
I1 = 20 mA |
V1-18sat |
− |
− |
0.8 |
V |
rejection voltage |
I1 < 10 μA |
V1-18 |
23 |
− |
− |
V |
DK circuit |
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Switch-on threshold level |
pin 2 high-Z |
V15DKon |
600 |
670 |
750 |
mV |
Switch hysteresis |
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V15DKon |
3.1 |
3.6 |
4.1 |
dB |
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--------------------- |
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V15DKoff |
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DK switch threshold level |
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for DK-off (Schmitt |
pin 2 |
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trigger output) |
conducting |
V16-18off |
− |
0.6 |
− |
V |
(typ. value 1 × VBE) |
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DK output (pin 2) |
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allowable load current |
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I2 |
− |
− |
1.5 |
mA |
saturation voltage |
I2 = 1.5 mA |
V2-18sat |
− |
− |
0.35 |
V |
rejection voltage |
I2 < 5 μA |
V2-18 |
18 |
− |
− |
V |
BK and DK filter amplifiers |
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Open loop gain |
f = 100 Hz |
Go |
84 |
− |
− |
dB |
Current gain |
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Gi |
120 |
− |
− |
dB |
Input bias current |
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± Ii |
− |
− |
50 |
nA |
Output offset voltage |
R5-6 = R14-15 |
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= 680 kΩ |
± Vo5-8 |
− |
− |
50 |
mV |
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± V15-8 |
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Available output current |
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± Io |
1 |
− |
− |
mA |
Output resistance |
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Ro |
− |
2 |
3.5 |
kΩ |
Allowable load |
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capacitance |
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CL |
− |
− |
50 |
pF |
May 1992 |
4 |
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