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Analog Devices Semiconductor Electronic Components Datasheet

AD8328 Datasheet

5 V Upstream Cable Line Driver

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AD8328 pdf
FEATURES
Supports DOCSIS and EuroDOCSIS standards for reverse
path transmission systems
Gain programmable in 1 dB steps over a 59 dB range
Low distortion at 60 dBmV output
−57.5 dBc SFDR at 21 MHz
−54 dBc SFDR at 65 MHz
Output noise level @ minimum gain 1.2 nV/√Hz
Maintains 300 Ω output impedance Tx-enable and
Tx-disable condition
Upper bandwidth: 107 MHz (full gain range)
5 V supply operation
Supports SPI interfaces
APPLICATIONS
DOCSIS and EuroDOCSIS cable modems
CATV set-top boxes
CATV telephony modems
Coaxial and twisted pair line drivers
GENERAL DESCRIPTION
The AD8328 is a low cost amplifier designed for coaxial line
driving. The features and specifications make the AD8328
ideally suited for MCNS-DOCSIS and EuroDOCSIS applications.
The gain of the AD8328 is digitally controlled. An 8-bit serial
word determines the desired output gain over a 59 dB range,
resulting in gain changes of 1 dB/LSB.
The AD8328 accepts a differential or single-ended input signal.
The output is specified for driving a 75 Ω load through a 2:1
transformer.
Distortion performance of −53 dBc is achieved with an output
level up to 60 dBmV at 65 MHz bandwidth over a wide
temperature range.
This device has a sleep mode function that reduces the quiescent
current to 2.6 mA and a full power-down function that reduces
power-down current to 20 μA.
The AD8328 is packaged in a low cost 20-lead LFCSP and
a 20-lead QSOP. The AD8328 operates from a single 5 V supply
and has an operational temperature range of −40°C to +85°C.
5 V Upstream
Cable Line Driver
AD8328
FUNCTIONAL BLOCK DIAGRAM
BYP
AD8328
VIN+
VIN–
DIFF
OR
SINGLE
INPUT
AMP
VERNIER
ZIN (SINGLE) = 800
ZIN (DIFF) = 1.6k
ATTENUATION
CORE
8
DECODE
POWER
AMP
ZOUT DIFF =
300
VOUT+
VOUT–
8 POWER-DOWN
DATA LATCH
LOGIC
RAMP
8
SHIFT
REGISTER
GND
DATEN SDATA CLK
Figure 1.
TXEN SLEEP
–50
–52
VOUT = 60dBmV
–54 @ MAX GAIN,
THIRD HARMONIC
–56
–58
–60
–62
VOUT = 60dBmV
–64 @ MAX GAIN,
SECOND HARMONIC
–66
–68
–70
5
15 25 35 45
FREQUENCY (MHz)
55
Figure 2. Worst Harmonic Distortion vs. Frequency
65
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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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

AD8328 Datasheet

5 V Upstream Cable Line Driver

No Preview Available !

AD8328 pdf
AD8328
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Logic Inputs (TTL-/CMOS-Compatible Logic)....................... 4
Timing Requirements .................................................................. 4
Absolute Maximum Ratings............................................................ 6
ESD Caution.................................................................................. 6
Pin Configurations and Function Descriptions ........................... 7
Typical Performance Characteristics ............................................. 8
Applications..................................................................................... 10
General Applications.................................................................. 10
Circuit Description..................................................................... 10
SPI Programming and Gain Adjustment ................................ 10
Input Bias, Impedance, and Termination................................ 10
Output Bias, Impedance, and Termination............................. 10
Power Supply............................................................................... 11
Signal Integrity Layout Considerations................................... 11
Initial Power-Up ......................................................................... 12
RAMP Pin and BYP Pin Features ............................................ 12
Transmit Enable (TXEN) and SLEEP...................................... 12
Distortion, Adjacent Channel Power, and DOCSIS .............. 12
Noise and DOCSIS..................................................................... 12
Evaluation Board Features and Operation.............................. 12
Differential Signal Source ......................................................... 13
Differential Signal from Single-Ended Source ....................... 13
Single-Ended Source.................................................................. 13
Overshoot on PC Printer Ports ................................................ 13
Installing Visual Basic Control Software................................. 13
Running AD8328 Software ....................................................... 14
Controlling Gain/Attenuation of the AD8328 ....................... 14
Transmit Enable and Sleep Mode............................................. 14
Memory Functions..................................................................... 14
Outline Dimensions ....................................................................... 17
Ordering Guide............................................................................... 18
REVISION HISTORY
10/05—Rev. 0 to Rev. A
Updated Format..................................................................Universal
Changes to Table 4............................................................................ 6
Updated Outline Dimensions ....................................................... 17
Changes to Ordering Guide .......................................................... 18
11/02—Revision 0: Initial Version
Rev. A | Page 2 of 20


Part Number AD8328
Description 5 V Upstream Cable Line Driver
Maker Analog Devices
Total Page 20 Pages
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