EVAL-ADXL312Z Analog Devices, EVAL-ADXL312Z Datasheet - Page 28

• Manufacturer Part Number: EVAL-ADXL312Z
• Description: Daughter Cards & OEM Boards EB Digital Output Three-Axis Accel
• Manufacturer: Analog Devices
• Series: ADXL312r

Specifications of EVAL-ADXL312Z

• Rohs: yes
• Product: Evaluation Boards
• Description/function: 3 axis accelerometer evaluation board
• Interface Type: I2C, SPI
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 2 V to 3.6 V
• Factory Pack Quantity: 1
• For Use With: ADXL312

ADXL312
NOISE PERFORMANCE
The specification of noise shown in Table 1 corresponds to the
best case noise of the ADXL312 in normal power operation
(LOW_POWER bit = 0 in BW_RATE register, Address 0x2C).
For normal power operation at data rates below 100 Hz, the
noise of the ADXL312 is equivalent to the noise at 100 Hz ODR
in LSBs. For data rates greater than 100 Hz, the noise increases
roughly by a factor of √2 per doubling of the data rate. For
example, at 400 Hz ODR, the noise on the x- and y-axes is
typically less than 2.0 LSB rms and the noise on the z-axis is
typically less than 3.0 LSB rms.
For low power operation (LOW_POWER bit = 1 in BW_RATE
register, Address 0x2C) the noise of the ADXL312 is constant
for all valid data rates shown in Table 7. This value is typically
less than 2.4 LSB rms for the x- and y-axes and typically less
than 3.5 LSB rms for the z-axis.
Figure 34 shows the typical Allan deviation for the ADXL312.
The 1/f corner of the device, as shown in this figure, is very low,
allowing absolute resolution of approximately 100 μg (assuming
there is sufficient integration time). The figure also shows that the
noise density is 340 μg/√Hz for the x- and y-axes and 470 μg/√Hz
for the z-axis.
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10k
100
130
120
100
110
1k
10
90
80
70
0.01
2.0
Figure 35. Normalized Noise vs. Supply Voltage, V
2.2
0.1
Figure 34. Root Allan Deviation
2.4
AVERAGING PERIOD,
SUPPLY VOLTAGE, V
X-AXIS
Y-AXIS
Z-AXIS
1
2.6
X-AXIS
Y-AXIS
Z-AXIS
2.8
10
3.0
S
100
(V)
(s)
3.2
1k
3.4
S
10k
3.6