전자부품 데이터시트 검색엔진 |
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AD8318 데이터시트(PDF) 3 Page - Analog Devices |
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AD8318 데이터시트(HTML) 3 Page - Analog Devices |
3 / 3 page 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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