U2514B

U2514B AM/FM Receiver for Digital Tuning with FM-Stereo Decoder Description The U2514B is an integrated bipolar radio suitable for digital tuning systems. It contains a FM front end with pre-amplifier and FM-stereo decoder as well as a complete AM receiver and demodulator. Stop-signal generation is implemented for FM and AM mode. This circuit is designed for use in small radios, power packs and multimedia applications Features D FM wideband AGC D LO-buffer for digital tuning D Integrated stop signal generation with true AM/ FM discriminators D High cut D Mute function D Pilot canceller D Supply voltage range 3 to 12 V D Package: SSO28 D Adjustable stop signal sensitivity D Automatic stereo-mono-blend Block Diagram FMOSCE FMOSCB FMRF 6 28 FMIN 2 FMAGC 8 OSCOUT GNDRF 4 AM FM stop signal detect 20 Pilot PLL 23 CTRLB 27 1 AMIN AM front end AM IF + demodulator Control unit VS V Ref GND 16 7 AMOSC IFOUT 10 12 FMIFIN AMIFIN 13 17 METER 9 22 26 AMFM 14 VREF 12305 AFSM FMDET 15 11 MPXOUT 25 MPXIN 24 Matrix decoder + HCC 18 OUTR 19 OUTL 21 LPF 5 3 FM front end FM IF + demodulator CERES CTRLA AMSADJ Figure 1. TELEFUNKEN Semiconductors Rev. A2, 04-Nov-96 1 (15) Preliminary Information U2514B Pin Description Pin 1 2 3 4 5 6 7 8 9 FMOSCB 6 AMOSC 7 OSCOUT 8 AMSADJ 9 IFOUT 10 AFSM 11 23 CTRLB 22 CTRLA 21 LPF 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Function AM antenna input FM-AGC time constant FM RF tank Ground RF FM oscillator emitter FM oscillator basis AM oscillator Buff...