ARA2000_11 Datasheet, PDF (1/21 Pages) ANADIGICS, Inc – Address-Programmable Reverse Amplifier with Step Attenuator

features
• 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 ^oC temperature range
Applications
• MCNS/DOCSIS Compliant Cable Modems
• CATV Interactive Set-Top Box
• Telephony over Cable Systems
• OpenCable Set-Top Box
• Residential Gateway
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
ARA2000
Address-Programmable Reverse
Amplifier with Step Attenuator
Data Sheet - Rev 2.3
S12 Package
28 Pin SSOP
with Heat Slug
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