5 V Upstream
a
Cable Line Driver
AD8328*
FEATURES
FUNCTIONAL BLOCK DIAGRAM
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
BYP
AD8328
V
V
IN+
OUT+
DIFF OR
SINGLE
INPUT
AMP
–54 dBc SFDR at 65 MHz
POWER
AMP
ATTENUATION
VERNIER
CORE
Output Noise Level @ Minimum Gain 1.2 nV/√Hz
Maintains 300 ꢀ Output Impedance TX-Enable and
Transmit-Disable Condition
V
IN–
V
OUT–
Z
DIFF =
OUT
300ꢀ
8
DECODE
Upper Bandwidth: 107 MHz (Full Gain Range)
5 V Supply Operation
Z
Z
IN
(SINGLE) = 800ꢀ
(DIFF) = 1.6kꢀ
IN
8
POWER-DOWN
LOGIC
RAMP
DATA LATCH
Supports SPI Interfaces
8
SHIFT
REGISTER
APPLICATIONS
DOCSIS and EuroDOCSIS Cable Modems
CATV Set-Top Boxes
CATV Telephony Modems
Coaxial and Twisted Pair Line Driver
GND
SDATA CLK
TXEN
DATEN
SLEEP
–50
–52
–54
–56
–58
–60
–62
–64
–66
–68
–70
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 Euro-DOCSIS applica-
tions. 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.
V
= 60dBmV
OUT
@MAX GAIN,
THIRD HARMONIC
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.
V
= 60 dBmV
OUT
@MAX GAIN,
SECOND HARMONIC
Distortion performance of –53 dBc is achieved with an output
level up to 60 dBmV at 65 MHz bandwidth over a wide tempera-
ture 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.
5
15
25
35
45
55
65
FREQUENCY – MHz
Figure 1. Worst Harmonic Distortion vs. Frequency
The AD8328 is packaged in a low cost 20-lead LFCSP package
and a 20-lead QSOP package. The AD8328 operates from a single
5 V supply and has an operational temperature range of –40°C
to +85°C.
*Patent Pending
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
www.analog.com
© Analog Devices, Inc., 2002
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