U2510B Datasheet | Atmel

Description The U2510B is an integrated bipolar one-chip AM/FM radio circuit. It contains an FM front end with preamplifier, FM IF and demodulator, a plete AM receiver, an AF amplifier and a mode switch for AM, FM and tape. This circuit is designed for clock radios and portable radio-cassette recorders. Features D Superior FM strong signal behavior by using RF AGC D Soft mute and HCC for decreasing interstation noise in FM mode D Excellent AFC performance (level controlled, both polarities available) D Level indicator (LED drive) for AM and FM D DC mode control: AM, FM and tape D Wide supply-voltage range and low quiescent current D High AF output power: 1 W D Electronic volume control D Electronic AF bandwidth control (treble and high cut) D Output stage for headphone and speaker drive Block Diagram FM RF tank FM ant. VS 9 8 7 AFC FM RF BPE AGC 12 FM front end FM AGC AM front end RF AGC Voltage stab. and mode control 15 AM/FM IF AGC AM AGC AFC control AM IF amp. and detect. IF Level indic. AF preamp. Volume Mute HCC 21 13 20 19 1 22 18 FM IF amp. FM discr. Power amp. 25 23 24 4 6 14 16 2 26 28 27 3 FM osc. tank IF BPE (Replaceable) AM ant. AM osc. tank VRef S2 VS AFC mode LED VS Treble Vol FM Tape Figure 1. Block diagram Rev. A3, 23-Feb-01 1 (15) Order Information Extended Type Number U2510B-M U2510B-M__T Package SDIP28 SDIP28 Pin 5 28 AF-GND 6 Remarks VS < 6 V supply voltage Symbol AMOsc FM- AFC Function AM oscillator tank circuit input, remended load impedance approximately 2.5 k W AFC diode connection, coupling capacitor (C19) determines the AFC characteristic (holding range and slope) FM oscillator tank circuit input, remended load impedance approximately 3 k W Regulated voltage output (2.4 V) FM RF tank circuit connection, remended load impedance approximately 3 k W AM RF tank circuit connection, remended load impedance approximately 20 k W FM AGC voltage output, time constant (C20). Loading this pin by a resistor (to GND)...