Datasheet

ADPD1080/ADPD1081 Data Sheet
Rev. B | Page 8 of 74
ANALOG SPECIFICATIONS
AVDD = DVDD = 1.8 V, T
A
= 25°C, unless otherwise noted. Compensation of the AFE offset is explained in the AFE Operation section.
Table 4.
Parameter Test Conditions/Comments Min Typ Max Unit
PULSED SIGNAL CONVERSIONS, 3 µs WIDE LED PULSE
1
4 µs wide AFE integration; normal operation,
Register 0x43 and Register 0x45 = 0xADA5
ADC Resolution
2
Transimpedance amplifier (TIA) feedback resistor
25 kΩ 3.27 nA/LSB
50 kΩ 1.64 nA/LSB
100 kΩ 0.82 nA/LSB
200 kΩ 0.41 nA/LSB
ADC Saturation Level TIA feedback resistor
25 kΩ 26.8 µA
50 kΩ 13.4 µA
100 kΩ 6.7 µA
200 kΩ 3.35 µA
Ambient Signal Headroom on Pulsed Signal TIA feedback resistor
25 kΩ 23.6 µA
50 kΩ 11.8 µA
100 kΩ 5.9 µA
200 kΩ 2.95 µA
PULSED SIGNAL CONVERSIONS, 2 µs WIDE LED PULSE
1
3 µs wide AFE integration; normal operation,
Register 0x43 and Register 0x45 = 0xADA5
ADC Resolution
2
TIA feedback resistor
25 kΩ 4.62 nA/LSB
50 kΩ 2.31 nA/LSB
100 kΩ 1.15 nA/LSB
200 kΩ 0.58 nA/LSB
ADC Saturation Level TIA feedback resistor
25 kΩ 37.84 µA
50 kΩ 18.92 µA
100 kΩ 9.46 µA
200 kΩ 4.73 µA
Ambient Signal Headroom on Pulsed Signal TIA feedback resistor
25 kΩ 12.56 µA
50 kΩ 6.28 µA
100 kΩ 3.14 µA
200 kΩ 1.57 µA
FULL SIGNAL CONVERSIONS
3
TIA Saturation Level of Pulsed Signal and Ambient
Level
TIA feedback resistor
25 kΩ 50.4 µA
50 kΩ 25.2 µA
100 kΩ 12.6 µA
200 kΩ 6.3 µA
TIA Linear Range TIA feedback resistor
25 kΩ 42.8 µA
50 kΩ 21.4 µA
100 kΩ 10.7 µA
200 kΩ 5.4 µA
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