0-1003800-5 Measurement Specialties Inc/Schaevitz, 0-1003800-5 Datasheet - Page 7

• Manufacturer Part Number: 0-1003800-5
• Description: SENSOR ACCELEROMETER 3-AXIS SMD
• Manufacturer: Measurement Specialties Inc/Schaevitz

Specifications of 0-1003800-5

• Rohs Status: RoHS non-compliant
• Axis: X, Y, Z
• Acceleration Range: ±250g
• Sensitivity: 1.8mV/g
• Output Type: Analog
• Interface: Parallel
• Mounting Type: Surface Mount
• Package / Case: Surface Mount
• Voltage - Supply: -
• Bandwidth: -
• Other names: ACH-04-08-05; MSP1004

Accelerometer ACH-04-08-05
114-27002
The constant-current bias circuit minimizes device-to-device and temperature related JFET transconductance
variations keeping the JFET gain near one (1). With the additional operational amplifier, the circuit has a gain of
x148, a one-pole low-pass filter at 159Hz, and a one-pole high-pass filter at 0.34Hz. The circuit’s component values
and DC reference/supply voltages can be scaled to fit many applications.
The resistor bias circuit positions the operating point in the middle of the transconductance curve again minimizing
transconductance variations. This circuit can also be powered from a single-supply voltage by creating an artificial
ground, VREF.
The following figure shows the circuit used in MSI’s Analog Test PCB (only one channel shown) which is available to
quickly evaluate the basic characteristics of the ACH-04-08-05 accelerometer. Contact the factory to receive more
information about the Analog Test PCB. Here, a resistor biasing scheme is used. The circuit runs from a single
supply voltage by generating a reference voltage, VREF. The circuit has a gain of x47.8, a high-pass corner
frequency of 0.34Hz, and a low-pass corner frequency of 185Hz. These values, as well as the operational amplifier,
are easily changed to suit specific applications. As shown, the circuit typically draws only 13µ A for all three axes.
3.3 Sensitivity Variation versus Temperature
The ACH-04-08-05's typical sensitivity variation versus temperature is shown on Page 5. As shown, the sensor
o
o
o
o
o
output varies +10% / -24% from -40
C to +85
C, respectively, relative to 25
C. From 0
C to +70
C, the sensitivity
variation is typically +5% / -16%, respectively. For many applications, this variation is acceptable (less than ±2dB
o
o
from -40
C to +85
C). If a tighter tolerance is required, the ACH-04-08-05 is easily temperature compensated. A
Rev A
Measurement Specialties Incorporated, Norristown, PA 19403 610-650-1500
7 of 10
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.