U4286BM

TELEFUNKEN Semiconductors U4286BM AM / FM-PLL Description The U4286BM is an integrated circuit in BICMOS technology for frequency synthesizer. It performs all the functions of a PLL radio tuning system and is controlled by I2C bus. The device is designed for all frequency synthesizer applications of radio receivers, as well as RDS ( Radio Data System ) applications. Features D Reference oscillator up to 15 MHz D Two programmable 16 bit dividers adjustable from 2 to 65535 D Two programmable switching outputs (open drain up to 20 V) D Fine tuning steps: AM y 1 kHz FM y 2 kHz D Few external component requirements due to integrated loop-transistor for AM/FM D High signal/ noise ratio Block Diagram SWO 1 OSCIN OSCOUT 14 Oscillator 15 2 3 4 7 Latch I2C–BUS Interface Shift register SWO 2 6 5 R–Divider Switching outputs Latch Status 11 Phase detector Preamplifier SCL SDA AS FMOSC Latch Current sources :2 AM/FM switch 8 GND 2 PDFM PDAM PDFMO PDAMO 12 AMOSC 9 Preamplifier N–Divider 1 VDD Figure 1. 10 Analogue outputs 13 16 GND 1 93 7581 e Rev. A1: 19.08.1996 Preliminary Information 1 (9) U4286BM Pin Description VDD SCL 1 2 3 4 16 15 14 13 GND OSCOUT OSCIN PDAMO PDAM PDFM PDFMO AMOSC Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 TELEFUNKEN Semiconductors SDA AS SWO 1 SWO 2 FMOSC GND 2 U 4286 BM 5 6 7 8 94 7908 e 12 11 10 9 Symbol VDD SCL SDA AS SWO 1 SWO 2 FMOSC GND 2 AMOSC PDFMO PDFM PDAM PDAMO OSCIN OSCOUT GND 1 Function Supply voltage I2C bus clock I2C bu...