AD8393 pra

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PRELIMINARY TECHNICAL DATA
Adaptive Linear Power
TM
+12V ADSL-CO Line Driver
Preliminary Technical Data
AD8393
FEATURES
•
Analog Devices’ Adaptive Linear Power
TM
architecture
o
Low power consumption for DSL line driver
applications
o
Enables high port density Central Office modems.
•
Allows single +12V supply (or +/-6V supplies) and a
transformer ratio of 1:1.2
o
Delivers power dissipation of 575mW for non-
overlapped applications (19.8dBm line power)
o
Delivers 624mW for overlapped applications
(20.4dBm line power).
•
MTPR of –67.4dBc (526KHz, 5.3 Crest Factor, non-
overlapped, R
L
= 70
Ω
)
BENEFITS
•
Reduces system complexity and cost
– Low power
architecture enables more ports per cubic centimeter,
reduced thermals, lower system power, and lower
line card power.
Fig. 1.
AD8393 MTPR Performance
•
Simplifies line card voltage requirements
– Single
supply operation (+12V) for CO designs.
APPLICATIONS
•
ADSL DSLAMs
•
xDSL line cards using DMT signals
PRODUCT DESCRIPTION
The AD8393 is a low power, high output current, low
distortion line driver that enables high port density DSL line
card designs. The AD8393 features ADI’s Adaptive Linear
Power
TM
architecture, which delivers the same performance
typically found with +/-12V drivers, but does so with a
single +12V supply. Able to drive Discrete Multi-Tone
signals with a Peak to Average Ratio from 3.3 to 6.4, the
AD8393 with a 1:1.2 transformer dissipates only 575mW of
total power for non-overlapped ADSL applications
(19.8dBm line power) and only 624mW for overlapped
ADSL applications (20.4dBm line power).
Fig. 2.
Plot of AD8393 showing Adaptive Linear Power
TM
where the supply voltage anticipates the peak output
The AD8393 offers distinctive advantages over competitive
solutions. The low power architecture allows an increase in
modem port count for a given thermal and power budget.
The single +12V supply simplifies the line card voltage bus
requirements. Both these key advantages enabled by the
AD8393 directly reduce DSL system complexity and cost.
The AD8393 is available in 28L TSSOP and 32L 5x5mm
LFCSP packages.
REV PrA Jan 2002
*Adaptive Linear Power
TM
is a trademark of Analog Devices, Inc. **Patents Pending
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 which
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
www.analog.com
Fax: 781/326-8703
©Analog Devices, Inc., 2002
a
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