描述 Description

GENERAL DESCRIPTION
The TEA5594 is a 32-pin integrated radio circuit designed for use in all Electronic Tuned Radio (ETR) sets especially those sets which have to fulfil the immunity requirements of CENELEC.
The AM circuit incorporates:
? A double balanced mixer
? A ‘one-pin’ oscillator with amplitude control operating in the LW/MW frequency range
? An IF amplifier and AM detector
? An AGC circuit which controls the IF amplifier and mixerThe FM circuit incorporates:
? A front-end (fulfilling the “out of band” CENELEC requirements)
? Two IF amplifiers (for distributed selectivity)
? A quadrature demodulator with a ceramic filterThe TEA5594 also contains:
? Oscillator output buffers for AM and FM
? A combined AM/FM IF counter output buffer with counter “enable” function
? A field strength level detector for AM and FM
? A soft mute circuit at FM, adjustable
? An extra IF amplifier to split up IF filtering

特性 Features

? Low distortion on FM
? AM/FM level/indicator circuit
? A DC AM/FM switch facility
? Supply voltages 2.7 to 15 V
? A local distance switch facility (LOCAL-DX) at FM
? All pins are ESD protected