Development board for MCP3561 ADC, a <153kSpS sigma-delta (oversampling) ADC capable of ~108dB SNR.
- 3.3V on-board reference
- low-noise 3.3V digital and analog supplies
- Powered via single 4V-12V input voltage
- Sampling rate tested up to 10kHz
- BNC input synchronization
- Single-channel SMA analog input
- Based on the Teensy 4.1, micro-USB communication to PC
- Additional digital/analog outputs (used here for motor control)
Measured with MCLK=10MHz, OSR=256, fs=9.76kHz, Av=1
- Rms voltage noise 9.8uV, PSD=143nV/rtHz, 0.2kHz to fs/2
Measured with MCLK=10MHz, OSR=256, fs=9.76kHz, Av=10
- Rms voltage noise is 13.4uV, PSD=195nV/rtHz, 0.2kHz to fs/2
Fig. 3 and 4 show the same plots with an input signal of 10mVrms (Av=10) at 105Hz.
Fig. 5 and 6 show the same plots with an input signal of 100mVrms (Av=10) at 205Hz.
Using this dev board requires you have python installed on your computer, as
well as the Teensyduino IDE. You must then upload the code in arduino_code/
to the Teensy being used for measurement, which I have written to communicate
via the arduino Serial() interface (USB) using the SCPI language. Feel free
to communicate with it using your own scripts, but I have written a python
implementation which can be found in MCP3561.py
here.
- [FIXED v2] U3 (TLV opamp) package is incorrect - TSOT353, actual package is SOT23-5.
- 1/f noise of TLV opamp is appreciable when configured for a gain of 10.