ARA2005 datasheet(1/16 Pages) ANADIGICS

Part #	ARA2005

Description	Reverse Amplifier with Step Attenuator

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Manufacturer	ANADIGICS [ANADIGICS, Inc]

Direct Link	http://www.anadigics.com

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08/2001

ARA2005

Reverse Amplifier with Step Attenuator

PRELIMINARY DATA SHEET - Rev 1.3

FEATURES

· Low cost integrated monolithic GaAs amplifier

with step attenuator

· Attenuation Range: 0-58 dB, adjustable in

4dB increments via a 4 wire parallel control

· Meets DOCSIS distortion requirements at a

+60dBmV output signal level

· Low distortion and low noise

· Frequency range: 5-100MHz

· 5 Volt operation

· -40 to +85 0C temperature range

APPLICATIONS

· MCNS/DOCSIS Compliant Cable Modems

· CATV Interactive Set-Top Box

· Telephony over Cable Systems

· OpenCable Set-Top Box

· Residential Gateway

The ARA2005 is a monolithic GaAs device designed

to provide the reverse path amplification and output

level control functions in a Cable TV Set Top Box or

Cable Modem. It incorporates a digitally controlled

precision step attenuator, which is preceded by an

ultra low noise amplifier stage and followed by an

ulta-linear output driver amplifier. The ARA2005 uses

a balanced circuit design that exceeds the MCNS/

DOCSIS requirement for harmonic performance at a

+60 dBmV output level while requiring only a single

+5V supply. Both the input and output of the device

are matched to 75 Ohms with an appropriate

transformer. The precision attenuator provides up to

58 dB of attenuation in 4 dB increments,

programmable via a four-bit digital control interface.

With external passive components, this device meets

IEC 1000-4-12 and ANSI/IEEE C62.41-1991 100KHz

ringwave tests, as well as IEC1000-4-5 1.2/50mS

surge tests. The ARA2005 is offered in a 28-pin SSOP

package.

PRODUCT DESCRIPTION

Figure 1: Cable Modem or Set Top Box Application Diagram

S8 Package

28 Pin SSOP

Diplexer

ARA2005

SAW

Filter

Double-

Conversion

Tuner

MAC

Upstream

QPSK/16QAM

Modulator

QAM Receiver

with FEC

Balun

Low Pass

Filter

Transmit Enable/Disable

Attenuation Control

Microcontroller

with Ethernet

MAC

RAM

ROM

10Base-T

Transceiver

RJ45

Connector

Clock

Data

54-860 MHz

44 MHz

5-42 MHz

4

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