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參數(shù)資料
| 型號(hào)： | ADXL50AH |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | Monolithic Accelerometer With Signal Conditioning |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, MBCY10 |
| 封裝： | HERMETIC SEALED, METAL CAN, TO-100, 10 PIN |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 286K |
| 代理商： | ADXL50AH |
ADXL50
REV. B
–9–
T he sensor’s tight mechanical spacing allows it to be electro-
statically deflected to full scale while operating on a 5 volt sup-
ply. A self-test is initiated by applying a T T L “high” level
voltage (>+2.0 V) to the ADX L50’s self-test pin which causes
the chip to apply a deflection voltage to the beam which moves
it an amount equal to –50 g (the negative full-scale output of the
device). Note that the
±
10% tolerance of the self-test circuit is
not proportional to the sensitivity error, see Self-T est section.
T he output of the ADX L50’s preamplifier is 1.8 V at 0 g accel-
eration with an output range of
±
0.95 V for a
±
50 g input, i.e.,
19 mV/g. An uncommitted buffer amplifier has been included
on-chip to enhance the user’s ability to offset the 0 g signal level
and to amplify and filter the signal. Access is provided to both
the inverting input and the output of this amplifier via pins
V
OUT
and V
IN–
, while the noninverting input is connected inter-
nally to a +1.8 V reference. T he +1.8 V is derived from a
resistor divider connected to the 3.4 V reference.
BASIC CONNE CT IONS FOR T HE ADX L50
Figure 19 shows the basic connections needed for the ADX L50
to measure accelerations in the
±
50 g range with an output scale
factor 40 mV/g corresponding to 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 kHz.
In general, the designer will need to take into account the initial
zero g bias when designing circuits. For the ADX L50J this off-
set is 1.8 V
±
250 mV. When microprocessors and software
Figure 18. Functional Block Diagram
+1.8V
CS1
BEAM
CS2
SYNCHRONOUS
DEMODULATOR
180
°
0
°
EXTERNAL
DEMODULATION
CAPACITOR
C1
C1
33k
33k
+5V
+1.8V
LOOP GAIN = 10
RST
3M
+0.2V
SYNC
COMMON
V
PR
INTERNAL
FEEDBACK
LOOP
1MHz
OSCILLATOR
75
+3.4V
+3.4V
EXTERNAL
OSCILLATOR
DECOUPLING
CAPACITOR
C2
+5V
+5V
INTERNAL
REFERENCE
+3.4V
+1.8V
+0.2V
+3.4V
V
REF
COM
+5V
BUFFER
AMPLIFIER
+1.8V
V
IN–
V
OUT
50k
SELF–TEST
(ST)
+3.4V
PREAMP
DENOTES EXTERNAL
PIN CONNECTION
Figure 19. ADXL50 Application Providing an Output Sensitivity of
40 mV/g, a +2.5 V 0 g Level and a Bandwidth of 1 kHz
V
OUTPUT
R2
274k
V
OUT
DEMODULATOR
REFERENCE
SENSOR
+1.8V
BUFFER
AMP
PREAMP
OSCILLATOR
ADXL50
C2
0.022
μ
F
OSCILLATOR
DECOUPLING
CAPACITOR
SELF TEST
(ST)
C3
+5V
0.022
μ
F
DEMODULATOR
CAPACITOR
C1
C1
COM
R1
49.9k
V
PR
V
IN–
R3
105k
+3.4V
4
7
5
1
2
3
8
10
9
6
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