We use the AD421 with a HART Modem. No we have problems with the HART noise during silence requirement. The AD421 produces an excessive noise level. We don't use the internal regulator of th AD421. The filtering / coupling is done according to…
求推荐类似AD421的环路供电的电流源芯片，最好比AD421好
Hello,
What's the re-flow temperature of AD421?
Our customer is currently using AD421 for the GAS detector(sensor node) application, but the customer requested to review AD5421 for price issue.
AD421 is being used in the range under 3.2mA(0mA, 2mA, 3mA), but I want to make sure if AD5421 is applicable…
I have a design that uses the AD421 in an optocoupled loop powered configuration. When I breath on the AD421 circuitry the output rises substantially on a few of the boards. Has anyone else seen this effect? What is going on? How do I correct it? The…
hi,
i've just started with the ad421. Well - in the moment it does not what it is supposed to do - instead it delivers 4mA constantly. For testing i tried to generate toggling 16 and 20 mA with a PIC16F1938. Under which conditions does the AD421 deliver…
Hi there,
Please correct my interpretation below if I have made any errors in my assumptions...
From your drawing, you have 2 separate field supplies for your two AD421 devices and if you drive their respective SPI interfaces and program the parts…
As a side-note I took a look at the AD421 and (apart from the size of the chip) it might be a better choice for me??
2线制 4-20mA的芯片，推荐AD421 AD5421
AD421：环路供电型4 mA-20 mA DAC
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