ARA05050 Datasheet, PDF (1/16 Pages) ANADIGICS, Inc – Reverse Amplifier with Step Attenuator

FEATURES
• Low Cost Integrated Monolothic GaAs Amplifier
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)
ARA05050
Reverse Amplifier with Step Attenuator
Data Sheet - Rev 2.2
S12 Package
28 Pin SSOP with Heat Slug
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
amplifier stage, and followed by an ultra-linear output
driver amplifier. This device is capable of meeting
the MCNS/DOCSIS requirements for harmonic
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.
4 Attenuation Control
Switch
ARA05050
LPF Balun
5-42 MHz
Transmit Enable/Disable
Diplexer
54-860 MHz
Double-
Conversion
Tuner
44 MHz
SAW
Filter
Upstream
QPSK/16QAM
Modulator
Clock
Data
MAC
Clock
Data
QAM Receiver
with FEC
RAM ROM
Microcontroller
with Ethernet
MAC
10Base-T
Transceiver
Figure 1. Cable Modem or Set Top Box Application Diagram
05/2005
RJ45
Connector