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Hardware
2.1.1
Explorer 16 PICtail Plus Connector (J4)
The Daughter Board connects to the Explorer 16 Development Board using edge
connector J3. The Daughter Board uses the following Explorer 16 signals:
? +3.3V power
? Ground
? dsPIC33F or PIC24H device ADC module inputs (3 inputs)
2.1.2
16-bit 28-pin Starter Development Board Connector (J2)
This connector allows the Daughter Board to be connected to Microchip's 16-bit 28-pin
Starter Development Board. The Daughter Board uses the following Explorer 16
signals:
? +3.3V power
? Ground
? dsPIC33F or PIC24H device ADC module inputs (3 inputs)
2.1.3
Anti-Aliasing Low-Pass Filter for Thermocouple Signal (U2)
The anti-aliasing low-pass filter uses the two op amps in the MCP617 dual op amp IC.
The output of the differential amplifier uses an anti-aliasing low-pass 4th-order
Sallen-Key structure to filter the signal and provide a cut-off frequency of 3300 Hz.
2.1.4
Differential Amplifier for Thermocouple Signal (U3)
The thermocouple differential amplifier uses three op amps in the MCP619 quad op
amp IC. The fourth op amp buffers the reference voltage provided to the differential
amplifier as well as the level shifter circuit. The output from a thermocouple is a pair of
analog voltage signals. The differential amplifier converts this signal pair into a
single-ended voltage signal for the on-chip ADC in the dsPIC33F or PIC24H device.
The external resistors R5, R6, R7 and R8 have been selected to provide an amplifier
gain of 249.
2.1.5
Anti-Aliasing Low-Pass Filter for Linear Signal (U5)
The anti-aliasing low-pass filter uses the two op amps in the MCP617 dual op amp IC.
The output of the level shifter circuit uses an anti-aliasing low-pass 8th-order
Sallen-Key structure to filter the signal and provide a cut-off frequency of 3300 Hz.
2.1.6
Jumper for Offset Calibration of Differential Amplifier (J5)
The jumper J5 can be used as a possible method of calibrating the output offset voltage
of the differential amplifier. To do this, install the jumper and measure the output voltage
at test point TP4.
2.1.7
Potentiometer for Differential Amplifier Output Offset
Adjustment (R38)
The constant output offset voltage can be adjusted manually by the user by rotating the
screw on potentiometer R38, either clockwise or counterclockwise. Rotating the
potentiometer screw clockwise increases the offset, whereas rotating it in a
counterclockwise direction decreases the offset. The offset can range from 0V to 1.65V.
2.1.8
Anti-Aliasing Low-Pass Filter for Temperature Sensor IC Signal
(U6)
The anti-aliasing low-pass filter uses the two op amps in the MCP617 dual op amp IC.
The output of the differential amplifier uses an anti-aliasing low-pass 4th-order
Sallen-Key structure to filter the signal and provide a cut-off frequency of 3300 Hz.
? 2008 Microchip Technology Inc.
DS70574A-page 13
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