Datasheet

Data Sheet ADPD1080/ADPD1081
Rev. B | Page 9 of 74
Parameter Test Conditions/Comments Min Typ Max Unit
SYSTEM PERFORMANCE
Total Output Noise Floor Normal mode; per pulse; per channel; no LED;
photodiode capacitance (C
PD
) = 70 pF
25 kΩ; referred to ADC input 1.0 LSB rms
25 kΩ; referred to peak input signal for
2 µs LED pulse
4.6 nA rms
25 kΩ; referred to peak input signal for
3 µs LED pulse
3.3 nA rms
25 kΩ; saturation SNR per pulse per channel
4
78.3 dB
50 kΩ; referred to ADC input 1.2 LSB rms
50 kΩ; referred to peak input signal for
2 µs LED pulse
2.8 nA rms
50 kΩ; referred to peak input signal for
3 µs LED pulse
2.0 nA rms
50 kΩ; saturation SNR per pulse per channel
4
76.6 dB
100 kΩ; referred to ADC input 1.5 LSB rms
100 kΩ; referred to peak input signal for
2 µs LED pulse
1.7 nA rms
100 kΩ; referred to peak input signal for
3 µs LED pulse
1.2 nA rms
100 kΩ; saturation SNR per pulse per channel
4
74.9 dB
200 kΩ; referred to ADC input 2.2 LSB rms
200 kΩ; referred to peak input signal for
2 µs LED pulse
1.3 nA rms
200 kΩ; referred to peak input signal for
3 µs LED pulse
0.9 nA rms
200 kΩ; saturation SNR per pulse per channel
4
71.2 dB
1
This saturation level applies to the ADC only and, therefore, includes only the pulsed signal. Any nonpulsatile signal is removed prior to the ADC stage.
2
ADC resolution is listed per pulse when the AFE offset is correctly compensated per the AFE Operation section. If using multiple pulses, divide by the number of pulses.
3
This saturation level applies to the full signal path and, therefore, includes both the ambient signal and the pulsed signal. The linear dynamic range of the TIA is 85% of
the TIA saturation levels shown.
4
The noise term of the saturation SNR value refers to the receiver noise only and does not include photon shot noise or any noise on the LED signal itself.
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