Address-Programmable Reverse
Amplifier with Step Attenuator
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Low cost integrated amplifier with step attenuator
Attenuation Range: 0-58 dB, adjustable in 1dB
increments via a 3 wire serial control
Meets DOCSIS distortion requirements at a
+60dBmV output signal level
Programmable address allows multiple parts to
share control bus
Low distortion and low noise
Frequency range: 5-100MHz
5 Volt operation
-40 to +85
o
C temperature range
MCNS/DOCSIS Compliant Cable Modems
CATV Interactive Set-Top Box
Telephony over Cable Systems
OpenCable Set-Top Box
Residential Gateway
ARA2000
Data Sheet - Rev 2.3
ApplicAtions
s12 package
28 pin ssop
with Heat slug
pRoduct descRiption
The ARA2000 is 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 amplifier stage, and
followed by an ultra-linear output driver amplifier. This
device uses a balanced circuit design that exceeds the
MCNS/DOCSIS requirement for harmonic performance
at a +60dBmV output level while only requiring a single
polarity +5V supply. Both the input and output are
matched to 75 ohms with an appropriate transformer.
The precision attenuator provides up to 58 dB of
attenuation in 1 dB increments. The ARA2000 has a
programmable address that allows multiple devices to
share a common control bus. The ARA2000 is offered
in a 28-pin SSOP package featuring a heat slug on
the bottom of the package.
figure 1: cable Modem or set top Box Application diagram
04/2011
ANADIGICS [ ANADIGICS, INC ]
