The BCM2002X is a Bluetooth 1.1 compliant integrated radio

transceiver device operating in the 2.4 GHz band. It is ideal for

integration in mobile phone applications where the radio has

been designed to handle the harsh environments of mobile

phones to provide the highest communication link quality of

service.

The BCM2002X uses fractional-N frequency generation

technology to synthesize the different reference frequencies for

mobile phone applications. The fractional-N technology

eliminates the need for a dedicated reference crystal, which

lowers BOM cost and eliminates an additional RF noise source.

The receiver front-end consists of a low-noise amplifier and an

image reject mixer. Balanced mixer structures fed by accurate

quadrature LO signals allow an excellent noise figure and strong

image rejection.

A low IF frequency allows for high performance amplifier and

filter designs in CMOS. The bandpass filter structure features

self-calibration circuitry that automatically adjusts circuit

elements to compensate for any process variation.

This

eliminates tuning and ensures that process and temperature

variation are uniform across the devices. The IF amplifiers

provide a limiting function so that the following stages always

get a constant signal level regardless of the RF input level. An

RSSI signal is also generated in these amplifiers for the system

to determine signal strength. The signal is then filtered further,

demodulated, and finally sent to a bit slicer to generate logic

level data output.

The BCM2002X is controlled via a BlueRF unidirectional

interface. BlueRF is a Bluetooth industry-standard specification

that provides compatibility between Bluetooth RF and baseband

chips. This interface provides control for the various sections of

the chip, defines data transfers and allows access to the various

internal registers of the device.

BCM2002X

OVER VIEW

Control

Interface

Modulator

Digital Input

Demodulator

Bit Slicer

Loop

Filter

LO

Generation

(BlueRF)

Frac-N PLL

RF Input

RF Output

Calibration

Control I/F

Digital Output

BCM2002X Functional Block Diagram

®

Phone: 949-450-8700

FAX: 949-450-8710

Email: info@broadcom.com

Web: www.broadcom.com

Corporation and/or its affiliates in the United States and certain other countries. All other

trademarks mentioned are the property of their respective owners.

BROADCOM CORPORATION

16215 Alton Parkway, P.O. Box 57013

Irvine, California 92619-7013

© 2003 by BROADCOM CORPORATION. All rights reserved.

2002X-PB04-R-06.13.03