I am utilizing the Microchip TC1046VNBTR on my PCB to measure ambient temperature of the board. I am trying to get a reasonably accurate reading (2-3 °C accuracy). I am using a basic setup based on my past experience with temperature sensors, so I am using the following circuit, except with NO 2.2 kΩ resistor.
When I do, I get a 1 ms oscillation output on the IC with a 283 mV peak-to-peak ripple, which is MASSIVE for a temperature sensor. See below for the oscilloscope of the output (VOUT - Pin 3).
I am trying to figure out how to resolve this. 1ms time period on the ripple is quite large and 10 uF for an output capacitor is also quite significant for this application.
Does anyone know what causes this and what can be done to resolve it?
I verified that this ripple does NOT exist on the 3.3 V supply.