OVERVIEW
Benefits & Features
- Low power 4-20 mA current loop
- 12-, 14-, or 16-bit digital control
- Use in programmable logic controllers
Applications:
- Programmable Logic Controllers/ Distributed Control Systems
- Field Instruments/ Smart Transmitters
CIRCUIT EVALUATION AND TEST
This circuit uses the EVAL-CN0179-PMDZ circuit board, the EVAL-SDP-CB1Z system demonstration platform (SDP) evaluation board and the SDP-PMD-IB1Z, a Pmod interposer board for the EVAL-SDP-CB1Z. The SDP and the SDP-PMD-IB1Z boards have 120-pin mating connectors, allowing the quick setup and evaluation of the circuit’s performance. In order to evaluate the EVAL-CN0179-PMDZ board using the SDP-PMD-IB1Z and the SDP, the EVAL-CN0179-PMDZ is connected to the SDP-PMD-IB1Z by a standard 100 mil-spaced, 25 mil square, right angle 12 pin-Pmod header connector.
Information and details regarding how to use the evaluation software for data capturing and proper hardware installation can be found in the CN0179 Software User Guide.
Equipment Required
- PC with a USB port and Windows® XP, Windows® Vista (32-bit), or Windows® 7 (32-bit)
- EVAL-CN0179-PMDZ circuit evaluation board
- EVAL-SDP-CB1Z SDP evaluation board
- SDP-PMD-IB1Z
- CN0179 evaluation software
- Agilent E36311A dual dc power supply or equivalent
- Agilent 3458A multimeter or equivalent
- +6 V wall wart
- A GPIB-to-USB cable adapter (only required for capturing analog data from the output and transferring it to the PC)
Information and details regarding how to use the evaluation software for data capturing and proper hardware installation can be found in the CN0179 Software User Guide.
Test Setup and Measurements
The circuit was tested using the test setup in Figure 5. A photograph of the board is shown in Figure 6.
A jumper should not be connected to the J1 terminals when driving an external current loop. The jumper connects the internal 250 Ω load and should be used when making voltage measurements.
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Figure 5. Functional Diagram of Test Setup
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Figure 6. Photo of EVAL-CN0179-PMDZ Board
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