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Analog Devices Semiconductor Electronic Components Datasheet

AD8325 Datasheet

5 V CATV Line Driver Fine Step Output Power Control

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a
FEATURES
Supports DOCSIS Standard for Reverse Path
Transmission
Gain Programmable in 0.75 dB Steps Over a 59.45 dB
Range
Low Distortion at 61 dBmV Output
–57 dBc SFDR at 21 MHz
–55 dBc SFDR at 42 MHz
Output Noise Level
–48 dBmV in 160 kHz
Maintains 75 Output Impedance
Transmit Enable and Transmit Disable Modes
Upper Bandwidth: 100 MHz (Full Gain Range)
5 V Supply Operation
Supports SPI Interfaces
APPLICATIONS
Gain-Programmable Line Driver
DOCSIS High-Speed Data Modems
Interactive Cable Set-Top Boxes
PC Plug-in Cable Modems
General-Purpose Digitally Controlled Variable Gain Block
5 V CATV Line Driver Fine Step
Output Power Control
AD8325
FUNCTIONAL BLOCK DIAGRAM
VCC (7 PINS)
BYP
R1 AD8325
VIN+
VIN–
DIFF OR
SINGLE
INPUT
AMP
VERNIER
R2
ZIN (SINGLE) = 800
ZIN (DIFF) = 1.6k
ATTENUATION
CORE
8
DECODE
POWER
AMP
ZOUT DIFF =
75
VOUT+
VOUT–
8
DATA LATCH
POWER-DOWN
LOGIC
8
SHIFT
REGISTER
DATEN DATA CLK GND (11 PINS) TXEN SLEEP
GENERAL DESCRIPTION
The AD8325 is a low-cost, digitally controlled, variable gain ampli­
fier optimized for coaxial line driving applications such as cable
modems that are designed to the MCNS-DOCSIS upstream
standard. An 8-bit serial word determines the desired output gain
over a 59.45 dB range resulting in gain changes of 0.7526 dB/LSB.
The AD8325 comprises a digitally controlled variable attenuator
of 0 dB to –59.45 dB, which is preceded by a low noise, fixed
gain buffer and is followed by a low distortion high power ampli­
fier. The AD8325 accepts a differential or single-ended input
signal. The output is specified for driving a 75 W load, such as
coaxial cable.
Distortion performance of –57 dBc is achieved with an output
level up to 61 dBmV at 21 MHz bandwidth. A key performance
and cost advantage of the AD8325 results from the ability to
maintain a constant 75 W output impedance during Transmit
Enable and Transmit Disable conditions. In addition, this
device has a sleep mode function that reduces the quiescent
current to 4 mA.
The AD8325 is packaged in a low-cost 28-lead TSSOP, operates
from a single 5 V supply, and has an operational temperature
range of –40C to +85C.
–50
VOUT = 62dBmV
@ MAX GAIN
–52
VOUT = 61dBmV
@ MAX GAIN
–54
–56
–58
–60
–62
–64
5
VOUT = 60dBmV
@ MAX GAIN
VOUT = 59dBmV
@ MAX GAIN
15 25 35 45 55
FUNDAMENTAL FREQUENCY – MHz
65
Figure 1. Worst Harmonic Distortion vs. Gain Control
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/461-3113 © 2005 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD8325 Datasheet

5 V CATV Line Driver Fine Step Output Power Control

No Preview Available !

AD8325* Product Page Quick Links
Last Content Update: 11/01/2016
Comparable Parts
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Documentation
Application Notes
• AN-851: A WiMax Double Downconversion IF Sampling
Receiver Design
Data Sheet
• AD8325: 5 V CATV Line Driver Fine Step Output Power
Control Data Sheet
Reference Materials
Product Selection Guide
• Variable Gain Amplifier Selection Table
Tutorials
• Design and Operation of Automatic Gain Control Loops for
Receivers in Modern Communication Systems
Design Resources
• AD8325 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
Discussions
View all AD8325 EngineerZone Discussions
Sample and Buy
Visit the product page to see pricing options
Technical Support
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number
* This page was dynamically generated by Analog Devices, Inc. and inserted into this data sheet. Note: Dynamic changes to
the content on this page does not constitute a change to the revision number of the product data sheet. This content may be
frequently modified.


Part Number AD8325
Description 5 V CATV Line Driver Fine Step Output Power Control
Maker Analog Devices
Total Page 17 Pages
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