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ADXL50JH Datasheet(Arkusz danych) 9 Page - Analog Devices

Numer części ADXL50JH
Szczegółowy opis  Monolithic Accelerometer With Signal Conditioning
Pobierz  16 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
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ADXL50
REV. B
–9–
The 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 TTL “high” level
voltage (>+2.0 V) to the ADXL50’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-Test section.
The output of the ADXL50’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
VOUT and VIN–, while the noninverting input is connected inter-
nally to a +1.8 V reference. The +1.8 V is derived from a
resistor divider connected to the 3.4 V reference.
BASIC CONNECTIONS FOR THE ADXL50
Figure 19 shows the basic connections needed for the ADXL50
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 ADXL50J 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
REF
OUTPUT
R2
274k
V
OUT
DEMODULATOR
REFERENCE
SENSOR
+1.8V
BUFFER
AMP
PREAMP
OSCILLATOR
ADXL50
C2
0.022
µF
OSCILLATOR
DECOUPLING
CAPACITOR
SELF TEST
(ST)
C3
+5V
0.022
µF
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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