Application Specification
Accelerometer ACH-04-08-05
114-27002
27 AUG 98 Rev A
1.0 INTRODUCTION
This specification covers the application requirements of Measurement Specialties Accelerometer ACH-04-08-05.
The accelerometer contains three piezoelectric sensing elements oriented to simultaneously measure acceleration
in three orthogonal, linear axes. Internal JFET’s provide for a low impedance, buffered output with a wide variety of
possible, application specific, signal conditioning circuitry. The sensor responds over a broad frequency range, from
below 0.5Hz to above 5kHz, as a result of the integrated electronics and the damped sensing elements.
The ACH-04-08-05 accelerometer can be used in a wide range of applications including motional measurement and
control systems, speaker feedback systems, vibration switches, shipment monitor and material handling systems,
security systems, computer input/output devices, and data loggers. The device is not IR reflow solderable.
Features of the accelerometer include:
I
Fully Contained 3-Axis Accelerometer
I
Low Frequency Response
I
High Resonant Frequency & Low Q
I
Excellent Linearity
I
Three Simultaneous Analog Outputs
I
Low-Impedance Output
I
Ultra-Low Power
I
Low Cost
2.0 REFERENCE MATERIALS
2.1 Revision Summary
This paragraph is reserved for a revision summary of changes and additions made to this specification. Revision A
changes include: document format, improved transverse sensitivity, interface circuit corrections, Analog Test PCB
Kit description, and additional performance curves.
©Copyright 1996 by MSI. All International Rights Reserved.
INFORMATIONAL
NOTES AND
DISCLAIMER
For drawings, technical data or samples, call 610-650-1500
Specifications subject to change. Consult MSI for latest specifications.
PN: 1003800-5 LOC ER
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Accelerometer ACH-04-08-05
114-27002
2.2 Customer Assistance
Reference MSI Part Number 1003800-5 and call (610) 650-1500 in the USA or +49 6074 862 822 in Europe to
obtain additional product information.
2.3 Drawings
MSI Customer Drawings are available for specific products. The information contained in Customer Drawings takes
priority if there is a conflict with this specification or with any other technical document supplied by MSI.
2.4 Absolute Maximum Ratings
CHARACTERISTICS
Applied Voltage (V
DD
with respect to GND)
Package Power Dissipation
ESD (Mil-Std-883, Method 3015.6)
VALUE
+28
100
2000
UNITS
V
mW
V
2.5 Pin Descriptions
PIN NUMBER
1
2
3
4
5
6
7
8
9
10
11
12
13
NAME
D/S1-Y
D/S2-Y
CTG
SGND
D/S1-X
D/S2-X
RGND-X
GND
CTG
RGND-Z
D/S1-Z
D/S2-Z
CTG
Y-Axis JFET Drain or Source
Y-Axis JFET Source or Drain
Connect to GND
Sensor Common
X-Axis JFET Drain or Source
X-Axis JFET Source or Drain
Resistor GND for the X-Axis
Device power - negative voltage with respect to V
DD
Connect to GND
Resistor GND for the Z-Axis
Z-Axis JFET Drain or Source
Z-Axis JFET Source or Drain
Connect to GND
DESCRIPTION
14
RGND-Y
Resistor GND for the Y-Axis
Note:
JFET is symmetrical. The DRAIN and SOURCE are interchangeable.
2.6 Environmental Characteristics
CHARACTERISTICS (T=25
C)
Operating Temperature
A
Storage Temperature
Relative Humidity ‡
SYMBOL
T
OP
T
S
RH
MIN
-40
-40
0
TYP
-
-
-
MAX
+85
+105
95
UNITS
C
C
%R.H.
g
Maximum Shock (Any Axis)
S
MAX
1,000
-
-
A
Nominal sensitivity will typically change less than ±15% over temperature range. ‡ Humidity must be non-condensing.
Rev A
Measurement Specialties Incorporated, Norristown, PA 19403 610-650-1500
Printed in U.S.A. For drawings, technical data or samples, contact call 610-650-1500.
Specifications subject to change. Consult MSI for latest specifications.
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Accelerometer ACH-04-08-05
2.7 Specification
CHARACTERISTIC (T=25
C)
X Axis Sensitivity
Y Axis Sensitivity
Z Axis Sensitivity
SYMBOL
M
X
M
Y
M
Z
f
L3dB
f
U3dB
f
o
Q
R
M
T
-
-
-
-
e
100
MIN
1.07
1.07
1.07
-
4,000
-
-
-
-
-
-
-
-
TYP
1.80
1.80
1.35
0.35
5,000
9,200
10
10
0.05
0.2
±250
0.1
0.2
0.35
MAX
-
-
-
0.7
-
-
-
-
-
-
-
1.0
-
-
114-27002
UNITS
mV/g
mV\g
mV/g
Hz
Hz
Hz
Hz/Hz
%
g/µ
g/
C/min
g’s
%
mg/
Hz
grams
N
N
N
Lower Frequency Limit (3dB Point)
Upper Frequency Limit (3dB Point)
Resonant Frequency
Resonant Q
Transverse Sensitivity
Base Strain Sensitivity
Temperature Transient Sensitivity
Dynamic Range
Linearity
Equivalent Noise (100Hz)
Weight
-
-
Reference Frequency is 10 Hz.
Assumes constant current bias, guarded Drain & Source
N
Tighter sensitivity tolerances available. Consult factory for options.
2.8 Electrical Specifications
CHARACTERISTICS (T=25
C)
J
Gate-Drain Voltage
Gate-Source Voltage
Gate Current
Power Dissipation
Power Derating
Gate-Source Cut-Off Voltage
Saturation Drain Current
SYMBOL
-
-
-
-
-
V
GS(OFF)
I
DSS
MIN
-30
-30
-
-
-
-0.5
10
50
TYP
-
-
-
-
3.27
-
-
-
MAX
-
-
10
360
-
-1.8
150
210
UNITS
V
V
mA
mW
mW/
o
C
V
µA
µS
@
CS Forward Transconductance
@
g
FS
J
JFET’s similar to 2N4117. Three per unit.
@
Specifications modified from standard 2N4117 JFET’s.
Rev A
Measurement Specialties Incorporated, Norristown, PA 19403 610-650-1500
Printed in U.S.A. For drawings, technical data or samples, contact call 610-650-1500.
Specifications subject to change. Consult MSI for latest specifications.
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Accelerometer ACH-04-08-05
2.9.1 Equivalent Electrical Schematic
114-27002
2.9.2 Interface Test Circuit (One Channel Shown)
Rev A
Measurement Specialties Incorporated, Norristown, PA 19403 610-650-1500
Printed in U.S.A. For drawings, technical data or samples, contact call 610-650-1500.
Specifications subject to change. Consult MSI for latest specifications.
4 of 10
Accelerometer ACH-04-08-05
114-27002
Rev A
Measurement Specialties Incorporated, Norristown, PA 19403 610-650-1500
Printed in U.S.A. For drawings, technical data or samples, contact call 610-650-1500.
Specifications subject to change. Consult MSI for latest specifications.
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