U4280BM-BFL datasheet(1/9 Pages) TEMIC

Part #	U4280BM-BFL

Description	AM / FM - PLL

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Manufacturer	TEMIC [TEMIC Semiconductors]

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U4280BM

Preliminary Information

TELEFUNKEN Semiconductors

Rev. A1, 10-Apr-97

1 (9)

AM / FM - PLL

Description

The U4280BM 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 Frequency range up to 150 MHz

D Pre-amplifier for AM and FM

D Fine tuning steps:

AM

y 1kHz

FM

y 2 kHz

D Two programmable 16-bit divider,

adjustable from 2 to 65535

D Reference oscillator up to 15 MHz

D 5 programmable switching outputs,

4 are open drain outputs up to 15 V

D Phase detector with separate outputs for AM and FM

D Controlled via I2C bus

Ordering Information

Extended Type Number

Package

Remarks

U4280BM-B

DIP20

U4280BM-BFL

SO20

Block Diagram

Shift register

Latch

I2C – BUS

interface

AM / FM–

switch

Preamplifier

N – Divider

Analog

outputs

Preamplifier

: 2

Lock

detector

Current

sources

Phase

detector

Latch

Status

R – Divider

Switching outputs

5

678

9

PRT

SWO1 SWO2 SWO3 AM/FM

14

13

16

17

15

PDFM

PDAM

PDFMO

PDAMO

LD

Oscillator

18

19

OSCOUT

2

3

4

SCL

SDA

AS

12

AMOSC

10

FMOSC

11

GND2

20

GND1

1

V

DD

13346

OSCIN

Figure 1. Block diagram

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