Connecting the Pulse Oximeter Demo to the computer and running the GUI graphs generates Figure 3-3. Clean signals are displayed on the graphs and an accurate 99% SpO2 and 62 BPM of the user are displayed.

The following graphing options are included in the software:

• Oversampled Waveform Graph: demonstrates the full-scale range of the ADC with oversampling to 16 bits to portray both the DC and AC components.
• IR Waveform Graph: demonstrates a magnified perspective of the AC component of the IR signal to emphasize a high level of clarity
• Red Waveform Graph: demonstrates a magnified perspective of the AC component of the IR signal to emphasize a high level of clarity

Figure 3-3 TIDA-010267 Pulse Oximeter Demo GUI for Testing and Display

Connecting the 2.5-V Voltage Reference to the OPA + ADC input for testing allows the user to serially capture the data for analysis on the computer, generating Figure 3-4 and Figure 3-5. A 15.3-bit ENOB is achieved with > 90-dB dynamic range, shown as a low-noise floor and low-deviation histogram, respectively.

Figure 3-4 MSPM0L1306 16-bit Oversampled Frequency-Domain Noise Graph

Figure 3-5 MSPM0L1306 16-bit Oversampled Frequency-Domain Noise Histogram