ADPD103 datasheet(7/53 Pages) AD

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ADPD103

Data Sheet

Rev. B | Page 6 of 52

ANALOG SPECIFICATIONS

AVDD = DVDD = 1.8 V, TA = full operating temperature range, 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

INPUT CAPACITANCE

100

PULSED SIGNAL CONVERSIONS, 3 μs WIDE LED PULSE1

4 μs wide AFE integration; normal operation, Register 0x43

(Time Slot A) and Register 0x45 (Time Slot B) = 0xADA5

ADC Resolution2

Transimpedance amplifier (TIA) feedback resistor

25 kΩ

1.64

nA/LSB

50 kΩ

0.82

nA/LSB

100 kΩ

0.41

nA/LSB

200 kΩ

0.2

nA/LSB

ADC Saturation Level

TIA feedback resistor

25 kΩ

13.4

μA

50 kΩ

6.7

μA

100 kΩ

3.35

μA

200 kΩ

1.67

μA

Ambient Signal Headroom on Pulsed Signal

TIA feedback resistor

25 kΩ

μA

50 kΩ

18.5

μA

100 kΩ

9.25

μA

200 kΩ

4.63

μA

PULSED SIGNAL CONVERSIONS, 2 μs WIDE LED PULSE1

3 μs wide AFE integration; normal operation, Register 0x43

(Time Slot A) and Register 0x45 (Time Slot B) = 0xADA5

ADC Resolution2

TIA feedback resistor

25 kΩ

2.31

nA/LSB

50 kΩ

1.15

nA/LSB

100 kΩ

0.58

nA/LSB

200 kΩ

0.29

nA/LSB

ADC Saturation Level

TIA feedback resistor

25 kΩ

18.9

μA

50 kΩ

9.46

μA

100 kΩ

4.73

μA

200 kΩ

2.37

μA

Ambient Signal Headroom on Pulsed Signal

TIA feedback resistor

25 kΩ

31.5

μA

50 kΩ

15.7

μA

100 kΩ

7.87

μA

200 kΩ

3.93

μA

FULL SIGNAL CONVERSIONS3

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

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