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AD7466 Datasheet(PDF) 4 Page - Analog Devices |
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AD7466 Datasheet(HTML) 4 Page - Analog Devices |
4 / 5 page CN-0178 Circuit Note Rev. A| Page 4 of 5 COMMON VARIATIONS For applications that require less RF detection range, the AD8363 rms detector can be used. The AD8363 has a detection range of 50 dB and operates at frequencies up to 6 GHz. For non-rms detection applications, the AD8317/AD8318/AD8319 or ADL5513 can be used. These devices offer varying detection ranges and have varying input frequency ranges up to 10 GHz (see CN-0150 for more details). The AD7466 is a single channel, 12-bit ADC with SPI interface. If the end application requires a multichannel ADC, the dual 12-bit AD7887 can be used. In multichannel applications that require multiple ADC and DAC channels, the AD7294 can be used. In addition to providing four 12-bit DAC outputs, this subsystem chip includes four uncommitted ADC channels, two high-side current sense inputs, and three temperature sensors. Current and temperature measurements are digitally converted and available to read over the I2C-compatible interface. CIRCUIT EVALUATION AND TEST This circuit uses the EVAL-CN0178-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-CN0178-SDPZ board contains the circuit to be evaluated, as described in this note, and the SDP evaluation board is used with the CN0178 evaluation software to capture the data from the EVAL-CN0178-SDPZ circuit board. Equipment Needed • PC with a USB port and Windows® XP or Windows Vista® (32-bit), or Windows® 7 (32-bit) • EVAL-CN0178-SDPZ Circuit Evaluation Board • EVAL-SDP-CB1Z SDP Evaluation Board • CN0178 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 CN0178 Evaluation Software disc in the CD drive of the PC. Using "My Computer," locate the drive that contains the evaluation software disc 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 file “EVAL-CN0178-SDPZ-SCH-Rev0.pdf” for the circuit schematics. This file is contained in the CN0178 Design Support Package. Setup Connect the 120-pin connector on the EVAL-CN0178-SDPZ circuit board to the connector marked “CON A” on the EVAL-SDP-CB1Z evaluation (SDP) board. Nylon hardware should be used 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-CN0178-SDPZ board via the SMA RF input connector. With power to the supply off, connect a +6 V power supply to the pins marked “+6 V” and “GND” 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-CN0178-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-CN0178-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 CN0178-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 CN0178 Evaluation Software ReadMe file. Information regarding the SDP board can be found in the SDP User Guide. |
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Similar Description - AD7466 |
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