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Photodiode PGA PICtail™ Daughter Board User’s Guide
DS51514A-page 8
2004 Microchip Technology Inc.
FIGURE 1-1:
Photodiode PGA PICtail™ Daughter Board Block Diagram.
The test points make it easier to test key points in the circuit, change the input signals
and to use this board as a stand-alone.
• GND Test Point – Connected to the ground plane and is a convenient ground
point for any lab equipment
• +5V Test Point – Allows measurement of the positive supply voltage and provides
a means to power this board with a laboratory power supply
• CH0 Test Point – The place to measure the transimpedance amplifier’s output
voltage (also the PGA’s CH0 input)
• CH1 Test Point – Makes it possible to send any desired signal to the PGA
More details on the circuit and on its design can be found in Appendix A. “Schematic
and Layouts” and in Application Note 951.
1.4
ASSOCIATED TOOLS
Figure 1-2 shows the block diagram of the hardware and software tools that the
Photodiode PGA PICtail™ Daughter Board is designed to work with. More informa-
tion on these tools can be found in the “Recommended Reading” section.
FIGURE 1-2:
Measurement Set-up Block Diagram.
Incident
CH1 Input
Photodiode
Op Amp
MCP6001U
PGA
MCP6S22
Photodiode PGA
PICtail™ Daughter Board
V
OUT
SPI™ Bus
4
CH0 Input
+5V
GND
GND
+5V
Light
Test Point
Test Point
Test Point
Test Point
PC
USB
Signal Analysis
PICtail™ Daughter Board
PICkit™ 1
Flash Starter Kit
14
Photodiode PGA
PICtail™l Daughter Board
PICkit™ 1 Signal Analysis
PC Program
14
PICkit™ 1
Firmware
PICA2Dlab.hex
Firmware
Hardware
Software
Содержание Photodiode PGAPICtail
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