Datenblatt-Suchmaschine für elektronische Bauteile |
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AD8603 Datenblatt(PDF) 7 Page - Analog Devices |
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AD8603 Datenblatt(HTML) 7 Page - Analog Devices |
7 / 9 page Circuit Note CN-0287 Rev. C | Page 7 of 9 The gain was set for G = 1, and the excitation current for 380 µA (Pt1000 configuration). Data was collected, then the jumpers connecting Channel 4, Channel 3, and Channel 2 were removed sequentially, and data collected for each condition. The results are shown in Figure 9. Figure 9. Error Generated by Leakage Current on Channel 1 for 4-Channel Pt100 RTD with G = 1 The ADC code changed from approximately 437,800 to 437,600 corresponding to a measurement change of 104.9015 Ω to 104.8627, or 0.0388 Ω. This represents a measurement error of approximately 0.1°C; however it can be removed by calibrating at room temperature with a fixed input configuration. COMMON VARIATIONS The AD779x low noise, low power, 16-/24-bit sigma-delta ADC family is more suitable for single channel or low power applications. The ADT7311, ±0.5°C accurate, 16-bit digital SPI temperature sensor is qualified for automotive applications. The cold junction compensation circuit accuracy can be improved by using a digital temperature sensor, such as ADT7320, with ±0.25°C accuracy. RMS isolation up to 5 kV is be available in the ADuM6401 digital isolator with dc-to-dc converter. CIRCUIT EVALUATION AND TEST This circuit uses the EVAL-CN0287-SDPZ circuit board and the SDP-B (EVAL-SDP-CB1Z) system demonstration platform controller board. The two boards have 120-pin mating connectors, allowing for the quick setup and evaluation of the performance of the circuit. The EVAL-CN0287-SDPZ board contains the circuit to be evaluated, as described in this note, and the SDP-B controller board is used with the CN-0287 Evaluation Software to capture the data from the EVAL- CN0287-SDPZ circuit board. Equipment Needed The following equipment is needed: • A PC with a USB port and Windows® XP (32 bit), Windows Vista®, or Windows® 7 • The EVAL-CN0287-SDPZ circuit board • The EVAL-SDP-CB1Z SDP-B controller board • The CN-0287 SDP Evaluation Software • The EVAL-CFTL-6V-PWRZ dc power supply or equivalent 6 V/1 A bench supply • A RTD or thermocouple sensor or sensor simulator. (The evaluation software supports the following RTDs: Pt100, Pt1000; Thermocouple: Type K, Type J, Type T, Type S.) Getting Started Install the evaluation software by placing the CN-0287 Evaluation Software into the CD drive of the PC. Using My Computer, locate the drive that contains the evaluation software. Functional Block Diagram See Figure 1 for the circuit block diagram and the EVAL- CN0287-SDPZ-PADSSchematic.pdf file for the complete circuit schematic. This file is contained in the CN0287 Design Support Package located at www.analog.com/CN0287-DesignSupport A functional block diagram of the test setup is shown in Figure 10. Figure 10. Test Setup Functional Block Diagram Setup Connect the 120-pin connector on the EVAL-CN0287-SDPZ circuit board to the CON A connector on the EVAL-SDP-CB1Z controller board (SDP-B). Use nylon hardware to firmly secure the two boards, using the holes provided at the ends of the 120-pin connectors. With power to the supply off, connect a 6 V power supply to the +6 V and GND pins on the board. If available, a 6 V wall wart can be connected to the barrel connector J2 on the board and used in place of the 6 V power supply. Connect the USB cable supplied with the SDP-B board to the USB port on the PC. Do not connect the USB cable to the Mini-USB connector on the SDP-B board at this time. Turn on the 6 V power supply to power up the evaluation board and SDP board, then plug in the Mini-USB cable into the Mini- USB port on the SDP board. 437860 437840 437760 437820 437780 437800 437740 437720 437700 437680 437660 437640 437620 437600 437580 ALL LEAKAGE INCLUDED LEAKAGE FROM CH4 REMOVED LEAKAGE FROM CH3 REMOVED LEAKAGE FROM CH2 REMOVED SENSORS EVAL-CFTL-6V-PWRZ 6V WALL WART CN(x) JP(x) (x) = 1, 2, 3, 4 EVAL-CN0287-SDPZ BOARD CN5 OR J2 120 PINS USB CABLE USB EVAL-SDP-CB1Z SDP BOARD PC OR SIGNAL GENERATORS 1.000V |
Ähnliche Teilenummer - AD8603 |
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Ähnliche Beschreibung - AD8603 |
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