10 mV anlog output

danielegener — Wed, 29 Apr 2015 09:03:08 GMT

Hi,

i am working with FRDM-K20D50M and i need an 10 mV output voltage.

How can i do this? I am not sure that this is possible with the DAC or PWM module.

Thanks in advanced!

Re: 10 mV anlog output

vicentegomez — Thu, 30 Apr 2015 22:58:08 GMT

Hi daniel

The Freedom K20 has a MK20DX128VLH5 device on LQFP64, unfortunately this device only has the 6-bit DAC key, that only can route to the internal comparator input, it does not have the option to put it to an external pin.

Others K20 like the K20_100 MHz has this option with the 12-bit Digital-to-Analog Converter (DAC), but not the K20_50 MHz.

Regarding to do it with the PWM,I believe that is not a good option, you only can control the pulse width, but not the voltage, so you will have a signal that if you measure you can get the 10mV ( average of the DC voltage) but the true is that you will have a signal with a little time on high and long time on low, I do not know what is your application, but probably this kind of signal are not properly for your application and also this signal can get electrical noise.

Regards

Vicente Gomez

topic 10 mV anlog output in Kinetis Microcontrollers

10 mV anlog output

Re: 10 mV anlog output