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參數(shù)資料
| 型號： | ADXL05AH |
| 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:11; Series:LJTP02R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:21; Circular Contact Gender:Socket; Circular Shell Style:Box Mount Receptacle |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, MBCY10 |
| 封裝： | HERMETIC SEALED, METAL CAN, TO-100, 10 PIN |
| 文件頁數(shù)： | 17/20頁 |
| 文件大?。?/td> | 281K |
| 代理商： | ADXL05AH |
ADXL05
–17–
REV. B
10
0%
100
90
200μs
2V
500mV
Figure 33. Top Trace: Voltage at Pin 1; Bottom Trace:
Buffer Output With R1 = R3 = 100 k
, C
F
= 0.01
μ
F
COMPONE NT SE LE CT ION
LOAD DRIVE CAPABILIT IE S OF T HE V
PR
AND BUFFE R
OUT PUT S
T he V
PR
and the buffer amplifier outputs are both capable of
driving a load to voltage levels approaching that of the supply
rail. However, both outputs are limited in how much current
they can supply, affecting component selection.
V
PR
Output
T he V
PR
pin has the ability to source current up to 500
μ
A but
only has a sinking capability of 30
μ
A which limits its ability to
drive loads. It is recommended that the buffer amplifier be used
in most applications, to avoid loading down V
PR
. In standard
±
5
g
applications, the resistor R1 from V
PR
to V
IN–
is recom-
mended to have a value greater than 20 k
to reduce loading
effects.
Capacitive loading of the V
PR
pin should be minimized. A load
capacitance between the V
PR
pin and common will introduce an
offset of approximately 1 mV for every 10 pF of load. T he V
PR
pin may be used to directly drive an A/D input or other source
as long as these sensitivities are taken into account. It is always
preferable to drive A/D converters or other sources using the
buffer amplifier (or an external op amp) instead of the V
PR
pin.
Buffer Amplifier Output
T he buffer output can drive a load to within 0.25 V of either
power supply rail and is capable of driving 1000 pF capacitive
loads. Note that a capacitance connected across the buffer
feedback resistor for low-pass filtering does not appear as a
capacitive load to the buffer. T he buffer amplifier is limited to
sourcing or sinking a maximum of 100
μ
A. Component values
for the resistor network should be selected to ensure that the
buffer amplifier can drive the filter under worst case transient
conditions.
Self-T est Function
T he digital self-test input is compatible with both CMOS and
T T L signals. A Logic “l(fā)” applied to the self-test (ST ) input will
cause an electrostatic force to be applied to the sensor which
will cause it to deflect to the approximate negative full-scale
output of the device. Accordingly, a correctly functioning accel-
erometer will respond by initiating an approximate –1 volt
so that the duty cycle is correct when the pulse is re-inverted
again by transistor, Q2, which cycles the accelerometer’s supply
voltage on and off.
ADXL05
V
PR
8
V
IN–
10
V
OUT
9
5
R3
R1
C
F
V
OUT
FROM μP
OR
FIGURE 1b
Q1
10k
2N3906
0.1μF
BUFFER
+5V
1
2N2222
100k
10k
Q2
Figure 31. Basic Power Cycling Circuit
Figures 32 and
33 show typical waveforms of the accelerometer
being operated with a 10% duty cycle: 1 ms on, 9 ms off. T his
reduces the average current consumption of the accelerometer
from 8 mA to 800
μ
A, providing a power reduction of 90%. T he
μ
P should sample acceleration during the interval between the
time the 0
g
level has stabilized (
≈
400
μ
s using a 0.022
μ
F
demod cap) and the end of the pulse duration. T he measure-
ment bandwidth of a power-cycled circuit will be set by the
clock pulse rate and duty cycle. In this example, 1 sample can
be taken every 10 ms which is 100 samples per second or 100
Hz. As defined by the “Nyquist criteria,” the best case measure-
ment bandwidth is F
S
/2 or half the clock frequency. T herefore
50 Hz signals can be processed if adequate filtering is provided.
10
0%
200μs
2V
1V
100
90
Figure 32. Top Trace: Voltage at Pin 1;
Bottom Trace: Output at V
PR
Higher measurement bandwidths can be achieved by reducing
the size of the demodulation capacitor below 0.022
μ
F and in-
creasing the pulse frequency. A 0.01
μ
F capacitor was con-
nected across the feedback resistor of the ADX L05 buffer to
improve its transient characteristics. T he optimum value for this
capacitor will change with buffer gain and the cycling pulse rate.
For more details, refer to application note AN-378.
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PDF描述 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADXL05BH | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Acceleration Detector |
| ADXL05EM-1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述: |
| ADXL05JH | 制造商:AD 制造商全稱:Analog Devices 功能描述:+-1 g to +-5 g Single Chip Accelerometer with Signal Conditioning |
| ADXL05KH | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Acceleration Detector |
| ADXL05TH | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Acceleration Detector |
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