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AD8318 데이터시트(PDF) 3 Page - Analog Devices

부품명 AD8318
상세설명  Stable, Closed-Loop Automatic Power Control for RF Applications
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Circuit Note
CN-0050
Rev. B | Page 3 of 3
On the underside of the ADL5330 and AD8318 chip scale
packages, there is an exposed compressed paddle. This paddle is
internally connected to the chip’s ground. Solder the paddle to
the low impedance ground plane on the printed circuit board to
ensure specified electrical performance and to provide thermal
relief. It is also recommended that the ground planes on all
layers under the paddle be stitched together with vias to reduce
thermal impedance.
COMMON VARIATIONS
This circuit can be used to implement a constant power out
function (fixed setpoint with variable input power) or a variable
power out function (variable setpoint with fixed or variable
input power). If a lower output power control range is desired,
the AD8318 log amp (60 dB power detection range) can be
replaced with either the AD8317 (50 dB power detection range)
or the AD8319 (45 dB power detection range). For a constant
output power function, the lowest dynamic range detector
(AD8319) is adequate because the loop always servos the
detector input power to a constant level.
The ADL5330 VGA, which is optimized for transmit applications,
can be replaced by the AD8368 VGA. The AD8368 is optimized
for receive application low frequencies of up to 800 MHz and
provides 34 dB of linear-in-dB voltage-controlled variable gain.
There are a number of DACs suitable for this application. All of
the following DACs have internal references:
Single: AD5660/AD5640/AD5620 (16-bit/14-bit/12-bit),
Dual: AD5663R/AD5643R/AD5623R (16-bit/14-bit/12-bit)
Quad: AD5664R/AD5644R/AD5624R (16-bit/14-bit/12-bit)
LEARN MORE
Dana Whitlow, Design and Operation of Automatic Gain Control
Loops for Receivers in Modern Communications Systems, Analog
Devices Wireless Seminar, Chapter 7, 2006.
MT-031 Tutorial, Grounding Data Converters and Solving the
Mystery of “AGND” and “DGND,” Analog Devices.
MT-073 Tutorial, High Speed Variable Gain Amplifiers, Analog
Devices.
MT-077 Tutorial, Log Amp Basics, Analog Devices.
MT-078 Tutorial, High Speed Log Amps, Analog Devices.
MT-101 Tutorial, Decoupling Techniques, Analog Devices.
Data Sheets
ADL5330
AD8318
AD8317
AD8319
ADL5330 Evaluation Board
AD8318 Evaluation Board
REVISION HISTORY
9/10—Rev. A to Rev. B
Changes to Figure 1 ..........................................................................1
Changes to Circuit Description Section.........................................1
Changes to Common Variations Section.......................................3
11/09—Rev. 0 to Rev. A
Updated Format ................................................................. Universal
Changes to Circuit Note Title..........................................................1
10/08—Revision 0: Initial Release
(Continued from first page) "Circuits from the Lab" are intended only for use with Analog Devices products and are the intellectual property of Analog Devices or its licensors. While you
may use the "Circuits from the Lab" in the design of your product, no other license is granted by implication or otherwise under any patents or other intellectual property by application or
use of the "Circuits from the Lab". Information furnished by Analog Devices is believed to be accurate and reliable. However, "Circuits from the Lab" are supplied "as is" and without
warranties of any kind, express, implied, or statutory including, but not limited to, any implied warranty of merchantability, noninfringement or fitness for a particular purpose and no
responsibility is assumed by Analog Devices for their use, nor for any infringements of patents or other rights of third parties that may result from their use. Analog Devices reserves the
right to change any "Circuits from the Lab" at any time without notice, but is under no obligation to do so. Trademarks and registered trademarks are the property of their respective
owners.
©2008–2010 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
CN08515-0-9/10(B)


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