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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