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ADXL05 Datasheet(PDF) 10 Page - Analog Devices

Part No. ADXL05
Description  Single Chip Accelerometer with Signal Conditioning
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADXL05 Datasheet(HTML) 10 Page - Analog Devices

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ADXL05
REV. B
–10–
The output of the synchronous demodulator drives the
preamp—an instrumentation amplifier buffer which is refer-
enced to +1.8 volts. The output of the preamp, VPR, is fed back
to the outer plate of the sensor through a 3 M
Ω isolation resis-
tor. The VPR voltage electrostatically resets the sensor back to its
0 g position and is a direct measure of the applied acceleration.
The output of the ADXL05’s preamplifier is 1.8 V
± 200 mV/g,
with an output range of
±1 V for a ±5 g input. An uncommit-
ted buffer amplifier provides the capability to adjust the scale
factor and 0 g offset level over a wide range. An internal refer-
ence supplies the necessary regulated voltages for powering the
chip and +3.4 volts for external use.
A self-test is initiated by applying a TTL “high” level voltage
(> +2.0 V dc) to the ADXL05’s self-test pin, which causes the
chip to apply a deflection voltage to the beam which moves it an
amount equal to –5 g (the negative full-scale output of the de-
vice). Note that the
±15% tolerance of the self-test circuit is not
proportional to the sensitivity error, see Self-Test section.
BASIC CONNECTIONS FOR THE ADXL05
Figure 19 shows the basic connections needed for the ADXL05
to measure accelerations in the
±5 g range with an output scale
factor 400 mV/g, a 2.5 V 0 g level, a
±2.0 V full-scale swing
around 0 g, and a 3 dB bandwidth of approximately 1.6 kHz.
Using the circuit of Figure 19, the overall transfer function is:
VOUT =
R3
R1
1.8 V – VPR
()
()+ R3
R2
(1.8)
()+1.8V
SENSOR
REFERENCE
6
9
10
8
3
2
1
5
7
4
DEMODULATOR
BUFFER
AMP
PREAMP
OSCILLATOR
ADXL05
C2
0.022
µF
OSCILLATOR
DECOUPLING
CAPACITOR
C3
0.1
µF
+5V
DEMODULATOR
CAPACITOR
C1
C1
COM
R1
49.9k
VPR
VIN–
R3
100k
VREF
OUTPUT
R2
274k
+3.4V
VOUT
SELF-TEST
(ST)
+1.8V
0.022
µF
Figure 19. ADXL05 Application Providing an Output Sensitivity of 400 mV/g,
a +2.5 V 0 g Level and a Bandwidth of 1 kHz
OBSOLETE


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