ST单片汽车收音机调谐器解决方案.PDF

获取更多权威电子资料 请登陆 ST单片汽车收音机调谐器解决方案 ST 的TDA7540B 是集成了立体声译码器和智能安全系统(ISS)的AM/FM 汽车收音机调谐器.这中高性能的 集成电路包括混频器,IF 放大器,AM 和 FM 解调器,立体声译码器,品质检测,ISS 滤波器,以及带IF 计数器的 PLL 合成器.本方案给出了TDA7540B 的主要性能,方框图以及便于理解的各个主要部分的方框图和详细的 应用电路图. TDA7540B AM/FM Car Radio Tuner IC with Stereo Decoder and Intelligent Selectivity System (ISS) The TDA7540 is a high performance tuner circuitfor AM/FM car radio. It contains mixer, IF amplifier, demodulator for AM and FM, stereodecoder, quality detection, ISS filter and PLL synthesizer with IF counter on a single chip.Use of BICMOS technology allows the implementation of several tuning functions and a minimum of external components. 主要特性: FM 部分: ■ RF AGC generation by RF and IF detection ■ I/Q mixer for 1st FM IF 10.7MHz with image rejection ■ Mixer for 2nd IF 450kHz ■ Internal 450KHz bandpass filter with bandwidth control by ISS ■ Fully integrated FM-demodulator with spike cancellation AM 部分: ■ Wide and narrow AGC generation ■ Mixer for 1st IF 10.7MHz, AM upconversion ■ Mixer for 2nd IF 450kHz, AM downconversion ■ Integrated AM-demodulator ■ AM IF- and audio noise blanking 立体声译码器: ■ PLL with adjustment free, fully integrated VCO ■ Automatic pilot dependent MONO/STEREO switching ■ Programmable ROLL-OFF compensation ■ High cut and stereo blend-characteristics programmable ■ Dedicated RDS-mute ■ Internal noise blanker with several threshold controls 其它特性: ■ VCO for world tuning range ■ High performance fast PLL for RDS-System ■ IF counter for FM and AM with search stop signal ■ Quality detector for level, deviation, adjacent channel and multipath 第 1 页 共 7 页 获取更多权威电子资料 请登陆 ■ ISS (Intelligent Selectivity System) for cancellation of adjacent channel and noise influences ■Adjacent channel mute ■ Fully electronic alignment ■All functions I2C-Bus controlled Fig1.