DESCRIPTION

The TDA7427A is a PLL frequency synthesizer with an additional IF counting system that performs all the functions needed in a complete PLL radio tuning system for conventional and high speed RDS tuners. The device has dedicated outputs for IN-LOCK detection and Search/Stop station.

■ ON-CHIP REFERENCE OSCILLATOR AND PROGRAMMABLE IF COUNTER

■ VHF INPUT AND PRECOUNTER FOR FREQUENCIES UP TO 290MHz

(SUITABLE FOR DAB APPLICATION)

■ HF INPUT FOR FREQUENCIES UP TO 64MHz (SHORT WAVE BAND)

■ IN-LOCK DETECTOR FOR SEARCH/STOP STATION FUNCTION

■ STAND-BY MODE FOR LOW POWER CONSUMPTION

■ HIGH CURRENT SOURCE FOR 0.5ms LOCK-IN TIME

■ DIGITAL PORT EXTENSION WITH SIX OUTPUTS FOR FLEXIBILITY IN APPLICATION

■ FULLY PROGRAMMABLE BY I2C BUS

TDA7427A属于集成电路（IC） > 时钟发生器，PLL，频率合成器。意法半导体（ST）集团制造生产的TDA7427A时钟发生器，PLL，频率合成器时钟发生器、PLL 和频率合成器集成电路 (IC) 可为逻辑器件提供参考信号的稳定定时脉冲，这些器件包括计算机、微控制器、数据通信系统和图形/视频发生器。这些集成电路可能包括缓冲器、驱动器、分频器、倍频器、多路复用器、合成器、扇出分配器和预分频器。