TDA1579 - NXP

TDA1579 radio transmissions Decoder

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 TDA1579 TDA1579T • Selective subcarrier amplifier (57 kHz) with gain control • Transmitter identification signal (SK) decoder • Area identification signal (BK) and announcement identif.

Features

TDA1579 TDA1579T
• 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 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. P.