ADXL202EB Datasheet, PDF (1/2 Pages) Analog Devices – Dual Axis Accelerometer Evaluation Board

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GENERAL DESCRIPTION
The ADXL202EB is a simple evaluation board that allows the
user to quickly evaluate the performance of the ADXL202 dual
axis ± 2 g accelerometer. Only three additional through-hole
passive components must be added, depending on the bandwidth
required in your application. The ADXL202EB has a 5-pin
0.1-inch spaced header for access to all power and signal lines
that may be attached to a prototyping board (breadboard) or wired
via a standard plug. Two holes are provided for mechanical
attachment of the ADXL202EB to your application.
CIRCUIT DESCRIPTION
The schematic and parts list of the ADXL202EB are shown in
Figure 1 and Table I respectively. The minimal application will
require at least one resistor (R_SET) added to the board to set the
PWM period (T2). Analog bandwidth may be set by adding
capacitors C2 and C3. Refer to the ADXL202 data sheet for a
complete description of the operation of the accelerometer.
The part layout of the ADXL202EB is shown in Figure 2. The
ADXL202EB has two factory- installed 2200 pF capacitors (C1
and C4) at X_FILT and Y_FILT to satisfy the minimum filter capacitor
specification of the ADXL202. Your application will likely require
narrower bandwidth (and lower noise), in which case a through-
hole capacitor may be added in parallel in the space provided
at C2 and C3 respectively. When calculating the capacitance
required to achieve the desired analog bandwidth do not forget
to subtract the 2200 pF already on the PCB. The pinout descrip-
tion of the ADXL202EB is shown in Table II.
SETTING THE PERIOD OF THE DUTY CYCLE
MODULATOR
The DCM period is set by R_SET. Choose a value between 100 kΩ
and 2 MΩ. See Table III for some typical R_SET values.
Dual Axis Accelerometer
Evaluation Board
ADXL202EB
C5
0.47␮F
ADXL202EB
1
A VDD
R_SET
ADDED
BY
USER
C3
ADDED
BY
USER
C4
2200pF
D ^XOUT
C YOUT
E COM
B ST
C1
2200pF
C2
ADDED
BY
USER
Figure 1. ADXL202EB Schematic
REV. 0
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