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AD7887 Datasheet(PDF) 4 Page - Analog Devices |
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AD7887 Datasheet(HTML) 4 Page - Analog Devices |
4 / 5 page CN-0150 Circuit Note Rev. C | Page 4 of 5 If an external voltage reference is to be used, the ADR421 2.5 V reference is recommended. Its 1 ppm/°C temperature drift results in a reference voltage variation of only 312 μV from −40°C to +85°C. This has a negligible effect on the overall temperature stability of the system. If a less dynamic range is required, the AD8317 (55 dB) or AD8319 (45 dB) log detector can be used. If a true rms responding power measurement is required, the AD8363 (50 dB) or ADL5902 (65 dB) can be used. CIRCUIT EVALUATION AND TEST This circuit uses the EVAL-CN0150A-SDPZ circuit board and the EVAL-SDP-CB1Z System Demonstration Platform (SDP) evaluation board. The two boards have 120-pin mating connectors, allowing for the quick setup and evaluation of the circuit’s performance. The EVAL-CN0150A-SDPZ board contains the circuit to be evaluated, as described in this note, and the SDP evaluation board is used with the CN0150A evaluation software to capture the data from the EVAL-CN0150A-SDPZ circuit board. Equipment Needed • PC with a USB port and Windows® XP or Windows Vista® (32-bit), or Windows 7 (32-bit) • EVAL-CN0150A-SDPZ Circuit Evaluation Board • EVAL-SDP-CB1Z SDP Evaluation Board • CN0150A Evaluation Software • Power supply: 6 V or 6 V wall wart • Environmental chamber • RF signal source • Coaxial RF cable with SMA connectors Getting Started Load the evaluation software by placing the CN0150A evaluation software CD in the CD drive of the PC. Using My Computer, locate the drive that contains the evaluation software CD and open the readme file. Follow the instructions contained in the readme file for installing and using the evaluation software. Functional Block Diagram See Figure 1 of this circuit note for the circuit block diagram and the EVAL-CN150A-SDPZ-SCH-Rev0.pdf file for the circuit schematics. This file is contained in the CN0150 Design Support Package. Setup Connect the 120-pin connector on the EVAL-CN0150A-SDPZ circuit board to the CON A connector on the EVAL-SDP-CB1Z evaluation (SDP) board. Use nylon hardware to firmly secure the two boards, using the holes provided at the ends of the 120-pin connectors. Using an appropriate RF cable, connect the RF signal source to the EVAL-CN0150A-SDPZ board via the SMA RF input connector. With power to the supply off, connect a 6 V power supply to the +6V and GND pins on the board. If available, a 6 V wall wart can be connected to the barrel connector on the board and used in place of the 6 V power supply. Connect the USB cable supplied with the SDP board to the USB port on the PC. Note: Do not connect the USB cable to the mini USB connector on the SDP board at this time. Test Apply power to the 6 V supply (or wall wart) connected to EVAL-CN0150A-SDPZ circuit board. Launch the evaluation software and connect the USB cable from the PC to the USB mini connector on the SDP board. Once USB communications are established, the SDP board can now be used to send, receive, and capture serial data from the EVAL-CN0150A-SDPZ board. The data in this circuit note were generated using a Rohde & Schwarz SMT-03 RF signal source and an Agilent E3631A power supply. The signal source was set to the frequencies indicated in the graphs, and the input power was stepped and data recorded in 1 dB increments. Temperature testing was performed using a Test Equity Model 107 environmental chamber. The EVAL-CN0150A-SDPZ evaluation board was placed in the chamber via a slot in the test chamber door, with the SDP evaluation board extending outside. Information and details regarding how to use the evaluation software for data capture can be found in the CN0150A evaluation software readme file. Information regarding the SDP board can be found in the SDP User Guide. LEARN MORE CN0150 Design Support Package: http://www.analog.com/CN0150-DesignSupport SDP User Guide MT-031 Tutorial, Grounding Data Converters and Solving the Mystery of “AGND” and “DGND,” 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. Whitlow, Dana. Design and Operation of Automatic Gain Control Loops for Receivers in Modern Communications Systems. Chapter 8. Analog Devices Wireless Seminar. 2006. Data Sheets and Evaluation Boards CN-0150 Circuit Evaluation Board (EVAL-CN0150A-SDPZ) System Demonstration Platform (EVAL-SDP-CB1Z) AD7887 Data Sheet AD7887 Evaluation Board AD8318 Data Sheet AD8318 Evaluation Board ADR421 Data Sheet |
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