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INTEGRATED CIRCUITS
DATA SHEET
TDA1581T Decoder for traffic warning (VWF) radio transmissions
Preliminary specification File under Integrated Circuits, IC01 March 1992
Philips Semiconductors
Preliminary specification
Decoder for traffic warning (VWF) radio transmissions
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 • SK and BK control outputs. GENERAL DESCRIPTION
TDA1581T
The TDA1581T 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 Measured in Fig.3 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 SYMBOL VP IP ViSK Zi ViSK Vi(p-p) mBKon ∆mBK tdSKon tdSKoff mDKon ∆mDK tdDKon tdDKoff Tamb supply current nominal input voltage input impedance control level input voltage peak-to-peak value SK switch-on threshold level SK switch hysteresis SK switch-on delay SK switch-off delay DK switch-on threshold level DK switch hysteresis DK switch-on delay DK switch-off delay operating ambient temperature range f = 57 kHz f ≤ 57 kHz −3 dB PARAMETER supply voltage range CONDITIONS MIN. 7.5 − − 100 − 2 − − − − − − − − −30 TYP. 8.5 6 8 − 2.4 − 42 3.5 150 750 13 3.6 750 750 − MAX. 10 − − − − − − − − − − − − − +80 UNIT V mA mV kΩ mV V % dB ms ms % dB ms ms °C
ORDERING INFORMATION PACKAGE EXTENDED TYPE NUMBER TDA1581T Note 1. SOT163-1; 1996 August 28. PINS 20 PIN POSITION SO MATERIAL plastic CODE SOT163A(1)
March 1992
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Philips Semiconductors
Preliminary specification
Decoder for traffic warning (VWF) radio transmissions
TDA1581T
March 1992
3
Fig.1 Block diagram.
Philips Semiconductors
Preliminary specification
Decoder for traffic warning (VWF) radio transmissions
PINNING SYMBOL n.c. DKout SKout τBK V5BK V6BK VP VP / 2 V9SK n.c. n.c. V12SK VAGC I14 VMPX V16DK V17DK τDK I19 GND PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 DESCRIPTION not connected DK output current SK output current time delay BK filter output BK filter input BK supply voltage half supply voltage SK detector output not connected not connected 57 kHz band pass filter AGC prestage biasing current MPX input filter input DK filter output DK time delay DK reference current for BK, DK detector ground
TDA1581T
Fig.2 Pin configuration.
March 1992
4
Philips Semiconductors
Preliminary specification
Decoder for traffic warning (VWF) radio transmissions
LIMITING VALUES In accordance with the Absolute Maximum System (IEC134). SYMBOL VP = V7-20 V2; 3-20 I2; 3 V15-20 I15 Ptot Tstg Tamb PARAMETER supply voltage switch output voltage switch output current signal input voltage signal input current total power dissipation storage temperature range operating ambient temperature range CONDITIONS pin 7 pins 2 or 3 pins 2 or 3 pin 15 pin 15 − −0.5 −10 −0.5 − − −55 −30 MIN. − − − − − − − − TYP.
TDA1581T
MAX. 15 15 5 VP −10 800 +150 +80
UNIT V V mA V mA mW °C °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. SYMBOL VP IP Zi Vi(p-p) ViSK Gv9-15 ∆Gv9-15 ∆Gv Vo9BK Vo9DK BK circuit Vo5BKon V o5BKon --------------------V o5BKoff V4-20off switch-on threshold level switch hysteresis pin 3 high-Z 600 3 670 3.5 750 4 mV dB PARAMETER supply voltage supply current CONDITIONS pin 7 pin 7 f ≤ 57 kHz Vo9BK = −3 dB V9BK / V15SK − MIN. 7.5 − 6 − − 2.4(1) 44(1) − − 440 220 TYP. MAX. 10 15 − − − − ±2 − − − UNIT V mA kΩ V mV dB dB dB mV mV
SK amplifier/decoder input impedance input voltage (peak-to-peak value) input voltage at start of gain control voltage gain gain spread gain control range controlled output voltage 60 2 − − − 40 − −
BK switch threshold level for BK-off (SK-off) (typ. value = 0.21V8-20) SK output (pin 3) permitted load current saturation voltage rejection voltage
pin 3 conducting
0.8
0.88
0.97
V
I3 V3-20sat V3-20
− I3 = 1.5 mA I3 < 5 µA − 18
− − −
0.5 0.35 −
mA V V
March 1992
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Philips Semiconductors
Preliminary specification
Decoder for traffic warning (VWF) radio transmissions
SYMBOL DK circuit V17DKon V 17DKon --------------------V 17DKoff V18-20off switch-on threshold level switch hysteresis pin 2 high-Z 600 3.1 670 3.6 PARAMETER CONDITIONS MIN. TYP.
TDA1581T
MAX.
UNIT
750 4.1
mV dB
DK switch threshold level for DK-off (Schmitt trigger output) (typ. value = 1 × VBE) DK output (pin 2) permitted load current saturation voltage rejection voltage
pin 2 conducting
−
0.6
−
V
I2 V2-20sat V2-20 Go Gi Ii Vo5-8 V17-8 Io Ro CL V8-20 R8 I8-20 I20-8 I8sc
− I2 = 1..