U2860B-B

U2860B-B Dual-Channel FM Sound Demodulator for TV Systems Description The U2860B is a dual-channel FM sound demodulator realized with TEMIC’s advanced bipolar process. All TV FM standards, from 4.5 up to 6.5 MHz (standard M, B/G, I, D/K) can be processed with high performance. The circuit is alignment-free and has a minimum number of external components. With 5 V supply voltage, the U2860B is suitable for TV, VCR and multimedia applications. Features D Two alignment-free PLL FM demodulators, automatic lock in on the received sound carrier frequency D Mute function for both sound channels D 5 V supply voltage, low power consumption D Few external components Package: DIP14, SO14 D Mono and dual channel application D Sound IF inputs provided for ceramic filters D Automatic mute for 2nd sound channel (squelch) VS Cstab 13 12 Supply 11 8 7 VAF1 Vin1 1 VCO 1 Loop filter 1 Mute 3 Mute VCO offset 10 VCO offset Rref (optional) Vin2 14 VCO 1 Loop filter 2 6 VAF2 Squelch 4 Squelch Squelch (second carrier) 94 8139 e 9 Figure 1. Block diagram TELEFUNKEN Semiconductors Rev. A1, 17-Jun-96 1 (11) Preliminary Information U2860B-B Circuit Description The U2860B includes two identical sound IF channels. Each consists of a limiter amplifier, PLL FM demodulator and AF amplifier. Additionally, this circuit contains a squelch function, mute switch and internal voltage regulation. Audio Amplifiers The demodulated signals are amplified to 500 mVrms with low output impedance a...