參數(shù)資料
型號: ADXL05
廠商: Analog Devices, Inc.
英文描述: Single Chip Accelerometer with Signal Conditioning(帶信號調(diào)節(jié)的單片加速計(jì))
中文描述: 單芯片加速度計(jì)信號調(diào)理(帶信號調(diào)節(jié)的單片加速計(jì))
文件頁數(shù): 10/20頁
文件大?。?/td> 292K
代理商: ADXL05
ADXL05
REV. B
–10–
T he output of the synchronous demodulator drives the
preamp—an instrumentation amplifier buffer which is refer-
enced to +1.8 volts. T he output of the preamp, V
PR
, is fed back
to the outer plate of the sensor through a 3 M
isolation resis-
tor. T he V
PR
voltage electrostatically resets the sensor back to its
0
g
position and is a direct measure of the applied acceleration.
T he output of the ADX L05’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 T T L “high” level voltage
(> +2.0 V dc) to the ADX L05’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-T est section.
BASIC CONNE CT IONS FOR T HE ADX L05
Figure 19 shows the basic connections needed for the ADX L05
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:
(
V
OUT
=
R
R
3
V
±
V
PR
(
)
)
+
R
R
3
(
)
+
1.8
V
SENSOR
REFERENCE
6
9
10
8
3
2
1
5
7
4
DEMODULATOR
BUFFER
AMP
PREAMP
OSCILLATOR
ADXL05
C2
0.022
μ
F
OSCILLATOR
DECOUPLING
CAPACITOR
C3
0.1
μ
F
+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
μ
F
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
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