ADXL250EB Analog Devices Inc, ADXL250EB Datasheet - Page 14

• Manufacturer Part Number: ADXL250EB
• Description: IC ACCELER DUAL-AX 50G 8-CLCC
• Manufacturer: Analog Devices Inc
• Series: iMEMS®r

Specifications of ADXL250EB

• Rohs Status: RoHS non-compliant
• Axis: X, Y
• Acceleration Range: ±50g
• Sensitivity: 38mV/g
• Voltage - Supply: *
• Output Type: Analog
• Bandwidth: 1kHz
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Not Compliant

to that provided by the converter and preamp (if used). It is
necessary to use sufficient post filtering with the accelerometer
to reduce its noise floor to allow full use of the converter’s reso-
lution (see post filtering section).
The use of a gain stage following the accelerometer will nor-
mally require the user to adjust the zero g offset level (either by
trimming or by resistor selection—see previous sections).
For many applications, a modern “economy priced” 10-bit
converter, such as the AD7810 allows you to have high resolu-
tion without using a preamp or adding much to the overall
circuit cost. In addition to simplicity and cost, it also meets two
other necessary requirements: it operates from a single +5 V
supply and is very low power.
ADXL150/ADXL250
–14–
b. Single-Pole Post Filtering, No Signal Amplification
c. Single-Pole Post Filtering and Signal Amplification
Figure 25. Interfacing the ADXL150/ADXL250 Series
Accelerometers to an ADC
a. Direct Connection, No Signal Amplification or
Post Filtering
+V
XL
S
+V
ADJUST
OFFSET
XL
+V
S
XL
S
V
NULL PIN
0 g
V
OS
OUT
V
OUT
V
R1
OUT
R
F
Cf
Cf
R
F
INPUT
RESISTANCE
ADC
ADC
+V
+V
S
S
ADC
+V
S
REV. 0