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Lesson Projects
3.4
LESSON 2 – PHOTODIODE
A simple photodiode circuit can be constructed from the schematic shown in
Figure 3-3. D 1 is a Panasonic PNZ334 PIN photodiode. U 1 is Microchip Technology
MCP6001U op amp. R 1 was chosen to be 64.9 k ? so that V OUT ≈ 4.5V at the maximum
I S , and V OUT ≈ 0V at the minimum I S . C 3 is a 0.1 μ F capacitor for good supply bypass
performance. R 2 and C 2 form a low-pass filter for noise performance. Since the
maximum sample rate of the Signal Analysis PICtail Daughter Board is 5000 samples
per second (sps), the low-pass pole is set near 500 Hz.
R 2 = 10.0 k ?
C 2 ≈ 1/(2 π (500 Hz)(10.0 k ? )) = 32 nF
The nearest standard value of 33 nF, giving
f RnCn = 1/(2 π (10.0 k ? )(33 nF)) = 482 kHz
Table 3-1 summarizes the final design values of the components in Figure 3-3.
Figure 3-4 through Figure 3-6 show screen captures from data acquisitions from the
photodiode placed 30 cm under a fluorescent desk lamp. The sample size was 1024
and the sample speed was set at 1000.
FIGURE 3-3:
PHOTODIODE PICtail? SCHEMATIC DIAGRAM
C 1
R 1
+5V
R 2
C 2
V OUT
D 1
PNZ334
U 1
MCP6001U
C 3
0.1 μ
TABLE 3-1:
PHOTODIODE PICtail? COMPONENTS
Component
C 1
C 2
C 3
D 1
R 1
R 2
U 1
? 2004 Microchip Technology Inc.
Value/Part No.
18 pF
33 nF
0.1 μ F
PNZ334
Panasonic
64.9 k ? , 1%
10.0 k ?
MCP6001U
Size/Package
SMD 0805
SMD 0805
SMD 0805
Plastic Through-hole,
100 mil pitch
SMD 0805
SMD 0805
SOT-23-5
DS51476A-page 23
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