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ARA2000S23P0 Datasheet

  • ARA2000S23P0

  • Analog Miscellaneous

  • 20頁

  • ETC

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ARA2000
Address-Programmable Reverse
Amplifier with Step Attenuator
FEATURES
路
路
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路
路
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路
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路
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
0
C temperature range
MCNS/DOCSIS Compliant Cable Modems
CATV Interactive Set-Top Box
Telephony over Cable Systems
OpenCable Set-Top Box
Residential Gateway
Data Sheet - Rev 1
APPLICATIONS
S23 Package
28 Pin SSOP
with Exposed Paddle
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 an exposed paddle
on the bottom of the package.
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
Clock
Data
Enable
Balun
ARA2000
Low Pass
Filter
Transmit Enable/Disable
Upstream
QPSK/16QAM
Modulator
Clock
Data
RAM
ROM
5-42 MHz
2
Address Control
MAC
Clock
Data
Microcontroller
with Ethernet
MAC
44 MHz
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
07-01

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