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Teilenummer | ADPD2212 |
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Beschreibung | High Sensitivity Optical Sensor | |
Hersteller | Analog Devices | |
Logo | ||
Gesamt 13 Seiten Data Sheet
Low Noise, High Sensitivity Optical Sensor
ADPD2212
FEATURES
Ultrahigh detectivity photodetector
90 fA/√Hz (typical) ultralow noise floor
Signal-to-noise ratio (SNR) near shot noise limit
137 µA (typical) of supply current when active
(EE = 0 µW/cm2)
1 µA (typical) of supply current in standby
High speed, deep junction photodiode
Nominal linear output current: 240 µA (typical)
Flexible output configuration
Excellent pulse response
High ambient light rejection
Space-saving, 3 mm × 4 mm LFCSP package
APPLICATIONS
Heart rate, pulse oximetry monitoring
(photoplethysmography)
Battery-powered medical sensors
Chemical analysis
FUNCTIONAL BLOCK DIAGRAM
VCC
+
CURRENT
AMPLIFIER
–
ADPD2212
OUT
PWDN GND
Figure 1.
GENERAL DESCRIPTION
The ADPD2212 is an optical sensor optimized for biomedical
applications. Very low power consumption and near theoretical
signal-to-noise ratio (SNR) are achieved by packaging an ultralow
capacitance deep junction silicon photodiode operated in zero
bias photoconductive mode with a low noise current amplifier.
The ADPD2212 offers a typical 400 kHz bandwidth performance,
which is well suited for use with pulsed excitation. The ADPD2212
uses very little power during operation and incorporates a
power-down pin, enabling power cycling to optimize battery
life in portable applications. The ADPD2212 provides shot
noise limited performance, making it an excellent choice for
measuring signals with the highest possible fidelity in low light
conditions. This combination of low power, very high SNR, and
electromagnetic interference (EMI) immunity enables low power
system solutions not possible with traditional photodiode (PD)
and transimpedance amplifier (TIA) systems.
Rev. 0
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Technical Support
www.analog.com
ADPD2212
TYPICAL PERFORMANCE CHARACTERISTICS
0°
–10°
–20°
–30°
1.0 –40°
–50°
0.8
HORIZONTAL
VERTICAL
–60°
–70°
–80°
0.6 0.4 0.2
0
0.2 0.4
0.6
Figure 4. Relative Radiant Sensitivity vs. Angular Displacement
9
8
7
6
5
4
3
2
1
0
WAVELENGTH (λ)
Figure 5. Responsivity vs. Wavelength
1µs
10µs
PWDN
–10 10 30 50
TIME (µs)
Figure 6. Power-Down Recovery Time, 1%
Data Sheet
1.8m
1.6m
1.4m
VCC = 1.8V
VCC = 2.5V
VCC = 3.3V
VCC = 5V
1.2m
1.0m
800µ
600µ
400µ
200µ
0
0 50 100 150 200 250 300 350 400 450
IOUT (µA)
Figure 7. Supply Current vs. Output Current (IOUT) over Supply Voltage (VCC)
1µA
100nA
0 20 40 60 80
TIME (µs)
Figure 8. Small Signal Pulse Response
2
1µA
10µA
0
–2
–4
–6
–8
–10
–12
100
1k 10k 100k
FREQUENCY (Hz)
Figure 9. Bandwidth/Peaking
100
1M
Rev. 0 | Page 6 of 13
6 Page ADPD2212
EVALUATION BOARD SCHEMATIC AND LAYOUT
Figure 17 shows the evaluation board schematic. Figure 15 and
Figure 16 show the evaluation board layout for the top and
bottom layers, respectively.
Data Sheet
Figure 16. ADPD2212 Evaluation Board Bottom Layer
Figure 15. ADPD2212 Evaluation Board Top Layer
PWDN
R2B
100kΩ
EVALZ-ADPD2212
U1A
VCC
C1B
0.01µF
OUT
GND
C2B
1µF
R1B DNI
100kΩ
1
PWDN
2
VCC
3
NIC
4
OUT
5
GND
EPAD
10
NIC
9
NIC
NIC 8
NIC 7
NIC 6
C3B DNI
0.01µF
Figure 17. ADPD2212 Evaluation Board Schematic (Do Not Install C3B)
Rev. 0 | Page 12 of 13
12 Page | ||
Seiten | Gesamt 13 Seiten | |
PDF Download | [ ADPD2212 Schematic.PDF ] |
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