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TDA7427AAD Arkusz danych(PDF) 1 Page - STMicroelectronics |
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1 / 21 page TDA7427A AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER ON-CHIP REFERENCE OSCILLATOR AND PROGRAMMABLE IF COUNTER VHF INPUT AND PRECOUNTER FOR FRE- QUENCIES 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 CON- SUMPTION HIGH CURRENT SOURCE FOR 0.5ms LOCK-IN TIME DIGITAL PORT EXTENSION WITH SIX OUT- PUTS FOR FLEXIBILITY IN APPLICATION FULLY PROGRAMMABLE BY I 2C BUS DESCRIPTION The TDA7427A is a PLL frequency synthesizer with an additional IF counting system that per- forms all the functions needed in a complete PLL radio tuning system for conventional and high speed RDS tuners. The device has dedicated out- puts for IN-LOCK detection and Search/Stop sta- tion. July 1998 ® SWITCH AM/FM PRECOUNTER :32/33 5 BIT PROG. COUNTER 11-21 BIT PROG COUNTER SWITCH SWM/DIR 11 BIT PROG COUNTER INLOCK DETECTOR PHASE COMP REF OSCILLATOR CHARGE PUMP - + SWITCH LP1/LP2 14 BIT PROG COUNTER TIMER CONTROL I2C BUS INTERFACE TEST LOGIC PORT EXTENSION FM_IN AM_IN OSCIN ADDR SCL SDA IF_AM IF_FM DOUT2 DOUT3 DOUT4 DOUT5 DOUT6 VDD2 GNDAN VREF LP_OUT VDD1 LP_FM LP_AM D95AU372D SWITCH SWM/DIR 16 BIT PROG COUNTER VDD1 OSCOUT SSTOP GNDDIG LP_HC DOUT1/INLOCK 24 25 9 10 20 12 13 27 21 22 14 15 16 18 5678 26 4 28 1 3 2 17 HFREF 19 SUPPLY & POWER-ON RESET SWITCH AM/FM SWITCH OUT BLOCK DIAGRAM ORDERING NUMBERS: TDA7427AAD (TSSOP28) TDA7427AAD1 (SO28) TSSOP28 SO28 1/21 |
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