The ADPD103 employs several methods of improving signal-to-noise ratio.
1. The first method that provides the best increase in signal to noise ratio is to increase the LED current. For every doubling of LED current there will be a 6dB increase in SNR up to the per pulse limit of the ADPD103 which is ~78dB at 25kΩ gain. The LED drivers can provide up to 370mA of current per pulse.
2. The second method to increase the effective SNR is to increase the number of pulses provided per sample. The SNR is improved by using multiple pulses because the signal will increase by a factor of N pulses while the noise will only increase by a factor of √N.
3. The ADPD103 also has a built-in averaging function which increases the SNR in a similar way where the SNR will increase as √N for N averages.
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