204227B • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • September 19, 2016

FEATURES

• LowCostIntegratedMonolothicGaAsAmplifier

With Step Attenuator

• Attenuation Range: 0-30 dB, Adjustable In

2dB Increments Via a 4 Wire Parallel Control

• Meets DOCSIS Distortion Requirements at

+58dBmV Output Signal Level

• Low Distortion and Low Noise

• Low Signal toNoise Ratio at All Gain Levels

• Frequency Range: 5-100 MHz

• 5 Volt Operation

• RoHS-Compliant Package Option

APPLICATIONS

• MCNS/DOCSIS Compliant Cable Modems

• CATV Interactive Set-Top Box

• OpenCable Set-Top Box

• Fiber Nodes

• Cable Modem Termination Systems (CMTS)

PRODUCT DESCRIPTION

The ARA05050 is a GaAs IC designed to provide the

reverse path amplification and output level control

functions in a CATV Set-Top Box or Cable Modem.

It incorporates a digitally controlled precision step

attenuator that is preceded by an ultra low noise

amplifierstage,andfollowedbyanultra-linearoutput

driver amplifier.This device is capable of meeting

the MCNS/DOCSIS requirements for harmonic

Figure 1: Cable Modem or Set Top Box Application Diagram

S12 Package

28 Pin SSOP with Heat Slug

performance at a +58dBmV output level while requiring

only a single polarity +5V supply. Both the input

and the output are single-ended and matched to 75

Ohms. The precision attenuator provides up to 30 dB

of attenuation in 2 dB increments. The ARA05050 is

offered in a 28-pin SSOP package that features a heat

slug on the bottom of the package, and is available in

a RoHS-compliant option.

LPF

Diplexer

ARA05050

SAW

Filter

Double-

Conversion

Tuner

MAC

Upstream

QPSK/16QAM

Modulator

QAM Receiver

with FEC

Balun

Transmit Enable/Disable

Attenuation Control

Microcontroller

with Ethernet

MAC

RAM

ROM

10Base-T

Transceiver

RJ45

Connector

Clock

Clock

Data

Data

54-860 MHz

44 MHz

5-42 MHz

4

LPF

Switch

ARA05050

ReverseAmplifierwithStepAttenuator

Data Sheet