TDA7427A - ST Microelectronics

TDA7427A AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER

The TDA7427A is a PLL frequency synthesizer BLOCK DIAGRAM TSSOP28 SO28 ORDERING NUMBERS: TDA7427AAD (TSSOP28) TDA7427AAD1 (SO28) 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/St.

Features

BIT PROG. COUNTER INLOCK DETECTOR 17 DOUT1/INLOCK 2 3 SWITCH LP1/LP2 1 LP_HC LP_AM LP_FM AM_IN 25 28 LP_OUT 11 BIT PROG COUNTER OSCIN OSCOUT 9 10 REF OSCILLATOR 16 BIT PROG COUNTER 4 VREF ADDR SCL SDA 20 12 13 I2C BUS INTERFACE 26 GNDAN VDD2 VDD1 GNDDIG IF_AM 27 21 22 14 SWITCH AM/FM 11-21 BIT PROG COUNTER PORT EXTENSION SUPPLY & POWER-ON RESET 14 BIT PROG COUNTER TIMER CONTROL TEST LOGIC IF_FM 15 16 D95AU372D 18 DOUT2 5 DOUT3 6 DOUT4 7 DOUT5 8 DOUT6 SSTOP July 1998 1/21 TDA7427A ABSOLUTE MAXIMUM RATINGS Symbol VDD1 VDD2 Ptot Tstg Tamb Supply Voltage Supply Voltage T.