REV. 0

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

a

AD6190

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 1998

900 MHz RF Transceiver

FUNCTIONAL BLOCK DIAGRAM

/2

10.7

Z87L00

SPREAD-

SPECTRUM

CONTROLLER

T/R

S/W

ANT

FILTER

POWER

MANAGEMENT

AND

CONTROL

VOLTAGE

REGULATOR

0

90

PA

0

90

64/65

10.7

10.7

15MHz SYNTHESIZER

VREG

VBATT

LIMOUT

RSSI

TXON

RXON

VCOON

VREG

AD6190

IQ

VCO

FEATURES

Complete 900 MHz RF Transceiver

LNA

Receive Mixer

Transmit Mixer

Driver Amplifier

VCO

Prescaler

Limiter Amplifier with RSSI

On-Chip Low Dropout Regulator

Independent Sleep Modes for TX, RX

28-Lead SSOP Package

APPLICATIONS

902 MHz–928 MHz ISM Band Cordless Telephones

902 MHz–928 MHz ISM Band Wireless Data Systems

GENERAL DESCRIPTION

The AD6190 900 MHz RF Transceiver provides a complete

RF/IF section for systems operating in the 902 MHz–928 MHz

license-free ISM band. The high level of integration allows several

dozen discrete components to be replaced. It is ideally suited

for use in cordless telephone and wireless data applications.

The receiver section includes a Low Noise Amplifier (LNA).

The LNA’s output drives an image-reject mixer; the mixer’s

output optimized for 10.7 MHz is filtered and processed by the

limiting IF amplifier.

The transmit section accepts a modulated 10.7 MHz IF input,

and uses an image-reject upconverter to mix the signal up to the

902 MHz–928 MHz RF carrier frequency while suppressing the

unwanted image and LO components. The RF output is raised

to a nominal 0.5 milliwatt (–3 dBm) output level. This output

can be used directly or can drive an external power amplifier to

higher levels.

The on-chip VCO operates at 2

× the local oscillator frequency.

This reduces oscillator pulling due to strong interferers in-band

or transmitter leakage. An on-chip 64/65 prescaler allows the

VCO to be controlled by a low cost 15 MHz CMOS synthesizer.

An on-chip low dropout regulator minimizes VCO pushing. The

transmit section, receive section, or both, can be placed in a low

current SLEEP mode when not in use. The AD6190 900 MHz

RF transceiver is packaged in a 28-lead SSOP package.

The AD6190 900 MHz RF Transceiver is part of the Analog

Devices/Zilog “A-to-Z Phone” Spread-Spectrum System for

cordless telephone and data communications applications. Con-

tact Zilog directly at (408) 370-8000 for more information on

the Z87000 series baseband controller chips.