Constantin
Well-known member
So we recently had a discussion regarding the time it takes for the ADC to charge it's caps and produce usable results.
My question to you is: how low is low enough re: impedance? Is there a section in the manual that deals with the impedance vs sampling speed vs resolution? I didn't see it in the ADC section but I'm happy to educate myself. Just need to know where to look...
Background: using the teensy 3.0 adc with its default input range from 0-3.3v with a ltsr-np current sensor that has a 0-5v output. I was thinking of just using a simple 1k/2k voltage divider to convert the output. But is such a impedance combination low enough to make the Teensy 3.0 ADC happy if its sampling on a differential basis @ 16 bits and a 6MHz internal clock?
I would like to hop back and forth between DAD0 and DAD3 to measure voltage and current. The voltage input circuit uses a AC-coupled adc driver to buffer the signal. I was hoping to avoid using same on the current side if I could.
My question to you is: how low is low enough re: impedance? Is there a section in the manual that deals with the impedance vs sampling speed vs resolution? I didn't see it in the ADC section but I'm happy to educate myself. Just need to know where to look...
Background: using the teensy 3.0 adc with its default input range from 0-3.3v with a ltsr-np current sensor that has a 0-5v output. I was thinking of just using a simple 1k/2k voltage divider to convert the output. But is such a impedance combination low enough to make the Teensy 3.0 ADC happy if its sampling on a differential basis @ 16 bits and a 6MHz internal clock?
I would like to hop back and forth between DAD0 and DAD3 to measure voltage and current. The voltage input circuit uses a AC-coupled adc driver to buffer the signal. I was hoping to avoid using same on the current side if I could.