The circuit on EVAL-CN0179-PMDZ is a 4 mA-to-20 mA current loop transmitter for communication between a process control system and its actuator. The circuit output is 0 mA to 20 mA of current, and it operates on a single supply from 8 V to 18 V. The 4 mA to 20 mA range is usually mapped to represent the input control range from the DAC or micro-controller, while the output current range of 0 mA to 4 mA is often used to diagnose fault conditions.
The 14-bit, 5 V AD5641 requires 75 µA typical supply current. The AD8657 is a rail-to-rail input/output dual op amp and is a low power amplifier (22 µA per amplifier over the full supply voltage and input common-mode range) with high operating voltage of up to 18 V. The ADR02 ultracompact precision 5 V voltage reference requires only 650 µA. Together, these three devices consume a typical supply current of 747 µA.
The circuit has a 12-pin Pmod™ digital interface (Digilent specification).
Manufacturer | Analog Devices Inc. |
---|---|
Category | Wired Communication |
Sub-Category | Interface Solutions |
Eval Board Part Number | EVAL-CN0179-PMDZ-ND |
Eval Board Supplier | Analog Devices Inc. |
Eval Board |
Normally In Stock
|
Purpose |
Current Loop
|
Component Count + Extras |
28 + 3
|
Features |
ADC's for Sensor Reading
Differential Inputs SPI Interface Synchronizable |
Data Rate (Max) |
- Not Given
|
Design Author |
Analog Devices
|
Main I.C. Base Part |
AD5641
AD8657 ADR02 |
Date Created By Author | 2013-12 |
Date Added To Library | 2018-03 |