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Hardware
4.3.2.3
AUDIO POWER AMPLIFIER (U7)
The audio power amplifier is a National Semiconductor, LM4853 Mono 1.5W/Stereo
300 mW amplifier. Gain has been set to 3.3 using the resistors R56 and R59, as shown
in Equation 4-2.
Gain = 2 × ? ---------- ?
EQUATION 4-2:
AUDIO POWER AMPLIFIER GAIN
R 56
? R 59 ?
4.3.2.4
ANTI-ALIASING LOW-PASS FILTER (SPEECH) (U6: A, B)
The PWM signal from the output compare module on the PIC24H MCU device on the
board is demodulated by the PWM low-pass filter. This 4th-order filter uses two op
amps (U6: A and U6: B) on the MCP617 dual op amp IC. The cut-off frequency of the
filter is ~4 kHz.
4.3.2.5
OLED DISPLAY (LED)
The starter kit has a 128 x 64 pixel, monochrome organic LED array, which provides a
wide range of graphics and alphanumeric display options.
4.3.2.6
SWITCH S1 AND SWITCH S2
The starter kit has two press switches, S1 and S2, which are connected to the I/O ports
on the PIC24H MCU device. The functions of these two switches are defined by the
application.
4.3.2.7
DIFFERENTIAL AMPLIFIER (EXTERNAL SENSOR) (U4: A)
The first op amp of the U4 component MCP617 is used to construct the differential
amplifier circuit, which is used in the analog signal conditioning circuit for the external
sensor.
4.3.2.8
ANTI-ALIASING LOW-PASS FILTER (EXTERNAL SENSOR) (U4: B)
The second op amp of the U4 component MCP617 is used to construct the anti-aliasing
low-pass filter circuit, which follows the differential amplifier circuit in the analog signal
conditioning circuit for the external sensor.
4.3.2.9
SENSOR DIFFERENTIAL INPUTS (EXTERNAL SENSOR) (TP11 AND
TP12)
The interface holes, TP11 and TP12, can be used to connect the differential outputs of
the external sensor. TP11 takes in the positive node and TP12 the negative node.
4.3.2.10
TRIAXIAL ANALOG ACCELEROMETER (U8)
The starter kit features a triaxial analog accelerometer, BMA140, from Bosch
Sensortec.
? 2008 Microchip Technology Inc.
DS51780A-page 31
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