There will be ever some trade-offs to consider. Since the common-mode input impedance of the amplifier is way high (6MOmh, typical) at both the +-4.096V and +-2.048V ranges, you can also craft a suitable resistive divider, in order to attain a total excursion near 2.2V 2.0V (easy with commonly available resistor values), and set PGA's FSR to +-2.048V, in order to max resolution.īy properly selecting divider's resistors values (and percent tolerance precision ones are better), you can get even closer to 2.048V, and enjoy ADC's maximum resolution, but then you will be depending on voltage regulator's precision. Finally, students will deploy digital circuits to hardware using NI Digital Systems Development Board to reinforce concepts discussed throughout the lab.
Students will explore the functionality of various digital circuits without the need of physical components. You'll also need to configure PGA's FSR to +-4.096V, in order to get a proper range. Students will learn to use the simulation software, Multisim, to simulate the behavior of digital circuits. Given you're using a potentiometer with the endpoints connected between 3.3V and GND (and an ADS1115), with its wiper routed to one of ADC's inputs (AIN), you should configure the input MUX section properly, routing the chosen input to AINp (positive input of PGA's), and GND to AINn (negative input of PGA's).
