What evaluation board would be the best option to convert the ADXL206 output to 4mA to 20mA?
Thank you for you inquiry. I will check to see if we have a reference design for this but if not, I would start with a product like the AD694.
Best regards, NevadaMark
I need an evaluation board to start developing, I was thinking to use something like EVAL-PRAOPAMP-4RZ based on AD822 and CN0064
I will wait for your input,
My 4mA to 20mA experience is somewhat limited, but if I were in your shoes, this is probably where I would start. Best, NevadaMark
I might consider using a small micro to read the SPI of the MEMs device and then control the SPI of a device like the AD5421:
You could use a simple micro like the Arduino to do this quite easily. You could also use the eval board of the AD5421, which uses a small DSP as the core.
Just a thought,
Thank you, Paul.
In this case, the MEMS device is the ADXL206, which has an analog output (no SPI) with 32kohms of souce impedance. It seems like your approach would still work, if used with a micro that had an ADC input, along with some buffering to drive the input stage. I was wondering if a micro/DAC combination would be a better approach but I didn't have a lot of experiece with this type of interface. Thanks again!
Maybe try looking at 4-20mA Drivers? Searching the product pages for these parts, I see evaluation boards available for the AD5750 and AD5420.
We also have current output DACs that could be used for generating 4-20mA. Just open the selection table for our Precision & General Purpose D/A Converters, add the parameter called 'Features', and then search for '4-20mA'. I see evaluations boards available for the AD5755, AD5755-1, AD5757, and AD5422.
The AD5421 is a good choice if you are looking for a loop-powered 4-20mA DAC. The AD5420/10 offers a 16bit/12bit 4-20mA current output solution, while the AD5422/12 offers a similar 4-20mA current output as well as a voltage output channel. The AD5755 offers a quad channels 4-20mA & voltage output solution, with onboard dynamic power control. This sounds like it would be overkill for your application.
If you require an output driver without the built in DAC (analog input, analog output), perhaps the AD5750 would be a good option for you? AD5750 Eval board link; AD5420 Eval board link
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