U2514B Datasheet | TEMIC Semiconductors

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 plete 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 AFSM FMDET 15 11 MPXOUT 25 MPXIN 24 Matrix decoder + HCC 18 OUTR 19 OUTL 21 LPF FM front end FM IF + demodulator CERES CTRLA AMSADJ Figure 1. TELEFUNKEN Semiconductors Rev. A2, 04-Nov-96 1 (15) Preliminary Information 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 Buffered AM/FM oscillator output AMSADJ Current-input for AM stop signal adjust IFOUT AM/FM IF output AFSM AF smoothing voltage FMIFIN FM IF amplifier input AMIFIN AM IF amplifier input VREF Reference voltage FMDET FM discriminator output GND Ground METER Fieldstrength voltage output OUTR AF output right OUTL AF output left CERES Resonator 456 k Hz LPF Low pass filter for Pilot-PLL CTRLA Control input for mute, search mode and search sensitivity CTRLB Control input for forced mono, control output for stop function and stereo information MPXIN Stereo decoder MPX...