ARA1400
Reverse Amplifier with Step Attenuator
Data Sheet - Rev 2.1
FEATURES
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Low cost integrated monolothic GaAs amplifier
with step attenuator
Attenuation Range: 0-56 dB, adjustable in
4 dB increments via a 4 wire parallel control
Meets DOCSIS distortion requirements at
+60 dBmV output signal level
Low distortion and low noise
Frequency range: 5-100 MHz
5 Volt operation
0 to +85 °C temperature range
APPLICATIONS
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MCNS/DOCSIS Compliant Cable Modems
CATV Interactive Set-Top Box
Telephony over Cable Systems
OpenCable Set-Top Box
Residential Gateway
S12 Package
28 Pin SSOP with Heat Slug
PRODUCT DESCRIPTION
The ARA1400 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. The device is capable of
meeting the MCNS/DOCSIS requirements for
4
Attenuation Control
harmonic performance at a +60dBmV output level
while requiring only a single polarity +5V supply.
Both the input and the output are single-ended and
matched to 75 Ohms, and a precision attenuator
provides up to 56 dB of attenuation in 4 dB
increments. The device is offered in a 28-pin SSOP
package featuring a heat slug on the bottom of the
package.
ARA1400
LPF
Balun
Upstream
QPSK/16QAM
Modulator
Clock
Data
RAM
ROM
5-42 MHz
Transmit Enable/Disable
MAC
Clock
44 MHz
Data
Microcontroller
with Ethernet
MAC
Diplexer
54-860 MHz
Double-
Conversion
Tuner
SAW
Filter
QAM Receiver
with FEC
10Base-T
Transceiver
RJ45
Connector
Figure 1: Cable Modem or Set Top Box Application Diagram
03/2004
ANADIGICS [ ANADIGICS, INC ]
