AD6523/AD6524

GSM Direct Conversion
Radio Chip Set

The Othello chip set

with each IC measuring

only 4.4 mm meets

current market demands

for smaller phones.

FEATURES

· New ADI Superhomodyne

Architecture (Direct Conversion Receiver)

meets current and future market demands

· Flexible and upgradable to support future generations of GSM phones

and multiple applications

· 30-50 percent cost and space savings result in less expensive and

smaller phones

· RF platform suitable for multi-mode and/or software radio markets

· Integrates single chip RF/Modulator/Baseband 28-TSSOP (AD6523) with

separate synthesizer 20-TSSOP. Chip scale packaging available next year

· Implemented in 0.6 um BiCMOS process

· Virtual-IF

transmitter loop

· Multi-band operation

· Ultra Fast Locking Fractional-N synthesizer for GPRS

· Signal chain optimization by utilizing ADI's systems experience, design

and process technology

GSM DIRECT CONVERSION CHIP SET
FEATURES BREAKTHROUGH
RF TECHNHOLOGY

Analog Devices' Othello,

a GSM (Global System

for Mobile Communications) direct conversion

radio chip set, features a revolutionary radio

architecture that provides 30-50 percent savings

in cost and size for the next generation of dual-

band and triple-band GSM phones.

Consisting of the AD6523 transceiver and the

AD6524 synthesizer, Othello allows incoming

signals to be "directly converted" to baseband,

thus eliminating the need for IF (Intermediate

Frequency) components. In addition, Othello's

patented architecture provides two other signifi-

cant performance benefits. First, the chip set

enables 1,000 hours, or 1.5 months, of standby

time for GSM cellular phones. Second, it pro-

vides capabilties for data rates of 25-30 times than

the 14.4 kbps of current GSM solutions. That

allows next generation content, like web browsing,

e-mail, games, and real-time video to be possible

over cellular phones and GSM platforms.

Codecs DSP

Mixed-Signal

Audio Interface

Processing

Sigma-Delta

Converters

High-Speed

Converters

Othello

Radio

Baseband

Power/Battery Management

reserved. Trademarks and registered
trademarks are the property of their
respective companies.

H3711-5-9/99

OTHELLO TECHNOLOGY:

Analog Devices' Othello chip
set solution is comprised of the
AD6523 transceiver and the
AD6524 synthesizer.

· AD6523 Transceiver

The AD6523 is a monolithic
Zero-Intermediate Frequency
(Zero-IF) transceiver that
combines, on a single chip, all
radio transmitter and receiver
functions that are necessary to
build a complete GSM,
DCS1800, or PCS1900 mobile
radio. It contains a complete
translation loop modulator for
directly modulating baseband
signals onto a voltage con-
trolled oscillator (VCO) as well
as a complete direct conver-
sion receiver for converting
received signals directly to
baseband without intermediate
frequency conversions. The
AD6523 is packaged in a
4.4 mm, 28 lead TSSOP.

· AD6524 Synthesizer

The AD6524 is a Multi-Band
Frequency synthesizer that
combines on a single chip,
a Fractional-N synthesizer,
a crystal oscillator, and four
general purpose outputs.
These functions are critical in
the design of GSM, DCS1800,
or PCS1900 mobile phones.
The AD6524 is packaged in
a 4.4 mm 20 lead TSSOP.

Together, the AD6523 and the
AD6524 can implement a com-
plete dual band RF transceiver
known as Analog Devices'
Othello.

NEW DIRECT CONVERSION
ARCHITECTURE

The Othello chip set solution is
based on Analog Devices' new
patent-pending direct conversion
architecture and features a greatly
simplified approach to traditional
radio architecture. Direct conver-
sion technology reduces cost,
component count, and power
consumption. At the same time,
emerging standards such as
EDGE (Enhanced Data GSM
Environment), GPRS (General
Packet Radio Service) and 3G
are addressed.

ADI's architecture lowers

manufacturing costs by eliminat-
ing the need for intermediate
frequency devices, the most
expensive components of the
radio. In addition, Othello is fully
compliant with GSM standards
and enables manufacturers to
upgrade easily and adapt their
products to muti-mode and
multi-slot data applications.

ANALOG DEVICES:
A LEADER IN GSM

An established supplier of
components and solutions to
GSM handset manufacturers,
Analog Devices has an incompara-
ble track record of high-volume,
low-cost manufacturing and
delivery. The company's mixed-
signal processors and baseband
converters are used in millions of
GSM handsets worldwide. The
Othello GSM direct conversion
radio chip set represents another
example of how Analog Devices
continually develops new prod-
ucts that meet the needs of the
GSM market.

ANALOG DEVICES IN
COMMUNICATIONS

Analog Devices is recognized for
its unparalleled technical capabili-
ties in analog, digital, and
mixed-signal processing used in
RF signal processing, data conver-
sion, interfaces, and total system
design. The company develops
and offers customers a wide range
of innovative wireless and broad-
band wired communications
products including solutions for
GSM; CDMA(Code Division
Multiple Access); cellular base
stations/software radio; RF and IF
(intermediate frequency) circuits,
and xDSL. The company is
committed to supplying the
communications industry with the
highest performance solutions at
the lowest possible cost.

www.analog.com

Othello was designed utilizing ADI's systems experience, design, and process technology
for signal chain optimization.

SPECIFICATIONS

AD6523

Complete Dual Band
Transmitter/Receiver includes:

Translation Loop Direct VCO
Modulator

Programmable Phase Detector
Gain

On-chip Flittering of Tx
Products

Zero-IF Direct Conversion
Receiver

Differential GSM Low Noise
Amplifier

Integrated Active Rx Channel
Select Low Pass Filters

Programmable Gain Baseband
Amplifiers

Baseband Interface

Multiplexed Differential I and Q
Inputs/Outputs

Auxiliary/Control-Signals Through
Serial Interface

On-chip Low Dropout Voltage
Regulator

2.9V to 5.5V Direct Battery
Voltage Input

Output to Supply All On-Chip
Functions

28-Lead TSSOP

1.65 V 2.95 V Digital
Interface

Direct Interface to AD6524
Multi-band Synthesizer

AD6524

Fractional-N Synthesizer

Operation to 1.6 GHz

Sigma-Delta Modulator--
Eliminates Fractional Spurs

Programmable Phase
Detector Gain

High-Speed Channel Switching
for Data Services

Crystal Oscillator

Standard 13 MHz GSM Operating
Frequency

Frequency Doubler for
Fractional-N Synthesizer

Course Tuning Function for Fast
Startup Time

Low Operating Current

General Purpose Outputs

Four CMOS ouputs for radio
switching 10 mA source or
sink current

Standard Three Wire Serial
Interface

20-Lead TSSOP

2.7-3.3 V Operation

1.65V 2.95 V Digital
Interface

Direct Interface to AD6523
Zero-IF Transceiver

Part Number AD6523