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Hardware
4.1.4
Analog Conditioning Circuitry
The starter kit features an analog conditioning circuit (see schematics in Figure A-4),
which can be used by the user to plug in a wide range of external analog sensors. The
analog conditioning circuit has a differential amplifier followed by an anti-aliasing low
pass filter. The gain of the differential amplifier is given by Equation 4-1 in terms of the
resistors used and differential input voltages at input points TP11 and TP12. The gain
is fixed at 100. Any sensor with a differential compensated output voltage of less than
33mV can be used.
EQUATION 4-1:
DIFFERENTIAL AMPLIFIER GAIN
Gain = ----- ( V TP 11 – V TP 12 )
R f
R i
R f = R 57 = R 58
R i = R 51 = R 53
The anti-aliasing filter is a 2nd-order low-pass filter, with a cut-off frequency of ~500 Hz
(483.78 Hz). The highest frequency of the base band sensor signal is assumed to be
less than 500 Hz. The output of the low-pass filter is connected to the ADC input AN7
on the PIC24H MCU device.
? 2008 Microchip Technology Inc.
DS51780A-page 27
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