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AD8328ACPZ-REEL Datasheet(PDF) 1 Page - Analog Devices

Part # AD8328ACPZ-REEL
Description  5 V Upstream Cable Line Driver
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD8328ACPZ-REEL Datasheet(HTML) 1 Page - Analog Devices

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5 V Upstream
Cable Line Driver
AD8328
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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.
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
FUNCTIONAL BLOCK DIAGRAM
DIFF
OR
SINGLE
INPUT
AMP
8
8
8
AD8328
VIN+
VERNIER
BYP
GND
RAMP
POWER-DOWN
LOGIC
POWER
AMP
ATTENUATION
CORE
DECODE
DATA LATCH
SHIFT
REGISTER
VIN–
SDATA CLK
TXEN
ZOUT DIFF =
300Ω
VOUT–
VOUT+
ZIN (SINGLE) = 800Ω
ZIN (DIFF) = 1.6kΩ
DATEN
SLEEP
Figure 1.
GENERAL DESCRIPTION
The AD83281 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.
FREQUENCY (MHz)
–70
–68
–66
–64
–62
–60
–58
–56
–54
–52
–50
VOUT = 60dBmV
@ MAX GAIN,
THIRD HARMONIC
VOUT = 60dBmV
@ MAX GAIN,
SECOND HARMONIC
5
1525
35
4555
65
Figure 2. Worst Harmonic Distortion vs. Frequency
1 Patent pending.


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