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TDA1581T Scheda tecnica(PDF) 2 Page - NXP Semiconductors |
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2 / 14 page March 1992 2 Philips Semiconductors Preliminary specification Decoder for traffic warning (VWF) radio transmissions TDA1581T 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 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 ORDERING INFORMATION Note 1. SOT163-1; 1996 August 28. SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT VP supply voltage range 7.5 8.5 10 V IP supply current − 6 − mA ViSK nominal input voltage f = 57 kHz − 8 − mV Zi input impedance f ≤ 57 kHz 100 −− k Ω ViSK control level −3 dB − 2.4 − mV Vi(p-p) input voltage peak-to-peak value 2 −− V mBKon SK switch-on threshold level − 42 − % ∆mBK SK switch hysteresis − 3.5 − dB tdSKon SK switch-on delay − 150 − ms tdSKoff SK switch-off delay − 750 − ms mDKon DK switch-on threshold level − 13 − % ∆mDK DK switch hysteresis − 3.6 − dB tdDKon DK switch-on delay − 750 − ms tdDKoff DK switch-off delay − 750 − ms Tamb operating ambient temperature range −30 − +80 °C EXTENDED TYPE NUMBER PACKAGE PINS PIN POSITION MATERIAL CODE TDA1581T 20 SO plastic SOT163A(1) |
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