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參數(shù)資料
| 型號： | ADXL105AQC |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Circular Connector; No. of Contacts:128; Series:LJTP02R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:25; Circular Contact Gender:Socket; Circular Shell Style:Box Mount Receptacle |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, CDSO14 |
| 封裝： | HERMETIC SEALED, CERPACK-14 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 258K |
| 代理商： | ADXL105AQC |
REV. A
ADXL105
–6–
THEORY OF OPERATION
The ADXL105 is a complete acceleration measurement system
on a single monolithic IC. It contains a polysilicon surface-
micromachined sensor and BiMOS signal conditioning circuitry
to implement an open loop acceleration measurement architec-
ture. The ADXL105 is capable of measuring both positive and
negative accelerations to a maximum level of
±
5
g
. The acceler-
ometer also measures static acceleration such as gravity, allow-
ing it to be used as a tilt sensor.
The sensor is a surface micromachined polysilicon structure
built on top of the silicon wafer. Polysilicon springs suspend the
structure over the surface of the wafer and provide a resistance
against acceleration-induced forces. Deflection of the structure
is measured with a differential capacitor structure that consists
of two independent fixed plates and a central plate attached to
the moving mass. A 180
°
out-of-phase square wave drives the
fixed plates. An acceleration causing the beam to deflect, will
unbalance the differential capacitor resulting in an output square
wave whose amplitude is proportional to acceleration. Phase sensi-
tive demodulation techniques are then used to rectify the signal
and determine the direction of the acceleration.
An uncommitted amplifier is supplied for setting the output
scale factor, filtering and other analog signal processing.
A ratiometric voltage output temperature sensor measures the
exact die temperature and can be used for optional calibration
of the accelerometer over temperature.
V
DD
The ADXL105 has two power supply (V
DD
) pins, 13 and 14.
The two pins should be connected directly together. The output
of the ADXL105 is ratiometric to the power supply. Therefore a
0.22
μ
F decoupling capacitor between V
DD
and COM is re-
quired to reduce power supply noise. To further reduce noise,
insert a resistor (and/or a ferrite bead) in series with the V
DD
pin. See the EMC and Electrical Noise section for more details.
COM
The ADXL105 has two common (COM) pins, 4 and 7. These
two pins should be connected directly together and Pin 7
grounded.
ST
The ST pin (Pin 6) controls the self-test feature. When this pin
is set to V
DD
, an electrostatic force is exerted on the beam of the
accelerometer causing the beam to move. The change in output
resulting from movement of the beam allows the user to test for
mechanical and electrical functionality. This pin may be left
open-circuit or connected to common in normal use. The self-
test input is CMOS and TTL compatible.
A
OUT
The accelerometer output (Pin 8) is set to a nominal scale fac-
tor of 250 mV/
g
(for V
DD
= 5 V). Note that A
OUT
is guaranteed
to source/sink a minimum of 50
μ
A (approximately 50 k
out-
put impedance). So a buffer may be required between A
OUT
and
some A-to-D converter inputs.
V
MID
V
MID
is nominally V
DD
/2. It is primarily intended for use as a
reference output for the on board uncommitted amplifier (UCA)
as shown in Figures 14a and 14b. Its output impedance is ap-
proximately 10 k
.
V
DD
T
OUT
ST
COM
A
OUT
V
MID
V
IN
V
NIN
UCA
OUT
UNCOMMITTED
AMPLIFIER
ADXL105
X SENSOR
TEMP
SENSOR
OUTPUT
V
DD
R1
R2
+V
COM
0.22
m
F
GAIN
1
2
3
4
250
500
750
1000
50k
V
50k
V
50k
V
50k
V
50k
V
100k
V
150k
V
200k
V
SCALE – mV/g
R1
R2
a. Using the UCA to Change the Scale Factor
V
DD
T
OUT
ST
COM
A
OUT
V
MID
V
IN
V
NIN
UCA
OUT
UNCOMMITTED
AMPLIFIER
ADXL105
X SENSOR
TEMP
SENSOR
OUTPUT
V
DD
R1
R2
+V
COM
0.22
m
F
+V
10k
V
R3
R3 = 5R1
R1 > 20k
V
SCALE =(25R1
mV/g
b. Using the UCA to Change the Scale Factor
and Zero g Bias
Figure 14. Application Circuit for Increasing Scale Factor
T
OUT
The temperature sensor output is nominally 2.5 V at +25
°
C and
typically changes 8 mV/
°
C, and is optimized for repeatability
rather than accuracy. The output is ratiometric with supply
voltage.
Uncommitted Amplifier (UCA)
The uncommitted amplifier has a low noise, low drift bipolar
front end design. The UCA can be used to change the scale
factor of the ADXL105 as shown in Figure 14. The UCA may
also be used to add a 1- or 2-pole active filter as shown in Fig-
ures 15a through 15d.
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