ADXL346ACCZ-R2 datasheet(36/40 Pages) AD

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ADXL346

Data Sheet

OPERATION AT VOLTAGES OTHER THAN 2.6 V

The ADXL346 is tested and specified at a supply voltage of

VS = 2.6 V; however, it can be powered with a VS as high as 2.75 V

or as low as 1.7 V. Some performance parameters change as the

supply voltage changes, including the offset, sensitivity, noise,

self-test, and supply current.

Due to minuscule changes in the electrostatic forces as supply

voltage is varied, the offset and sensitivity change slightly. When

operating at a supply voltage of VS = 1.8 V, the offset of the x- and

y-axes is typically 25 mg higher than at VS = 2.6 V operation. The

z-axis is typically 20 mg lower when operating at a supply voltage

of 1.8 V than when operating at VS = 2.6 V. Sensitivity on the

x- and y-axes typically shifts from a nominal 256 LSB/g (full-

resolution or ±2 g, 10-bit operation) at VS = 2.6 V operation to

250 LSB/g when operating with a supply voltage of 1.8 V. The z-axis

sensitivity is unaffected by a change in supply voltage and is the

same at VS = 1.8 V operation as it is at VS = 2.6 V operation. Simple

linear interpolation can be used to determine typical shifts in

offset and sensitivity at other supply voltages.

Changes in noise performance, self-test response, and supply

current are discussed elsewhere throughout the data sheet. For

more information about noise performance, review the Noise

Performance section. The Self-Test section discusses both the

operation of self-test over voltage (a square relationship with the

supply voltage) and the conversion of the self-test response in

g’s to LSBs. Finally, Figure 33 shows the impact of supply voltage

on typical current consumption at a 100 Hz output data rate,

with all other output data rates following the same trend.

OFFSET PERFORMANCE AT LOWEST DATA RATES

The ADXL346 offers several output data rates and bandwidths

designed for a wide range of applications. However, at the lowest

data rates, described as those data rates below 6.25 Hz, the offset

performance over temperature can vary significantly from the

remaining data rates. Figure 57, Figure 58, and Figure 59 show

the typical offset performance of the ADXL346 over temperature

for data rates of 6.25 Hz and lower. All plots are normalized to

the offset at 100 Hz output data rate; therefore, a nonzero value

corresponds to additional offset shift due to the temperature for

that data rate.

When using the lowest data rates, it is recommended that the

operating temperature range of the device be limited to provide

minimal offset shift across the operating temperature range.

Due to variability between parts, it is also recommended that

calibration over temperature be performed if any data rates

below 6.25 Hz are in use.

100

120

140

TEMPERATURE (°C)

0.10Hz

0.20Hz

0.39Hz

0.78Hz

1.56Hz

3.13Hz

6.25Hz

Figure 57. Typical X-Axis Output vs. Temperature at Lower Data Rates,

Normalized to 100 Hz Output Data Rate, VS = 2.6 V

100

120

140

TEMPERATURE (°C)

0.10Hz

0.20Hz

0.39Hz

0.78Hz

1.56Hz

3.13Hz

6.25Hz

Figure 58. Typical Y-Axis Output vs. Temperature at Lower Data Rates,

Normalized to 100 Hz Output Data Rate, VS = 2.6 V

–20

100

120

140

TEMPERATURE (°C)

0.10Hz

0.20Hz

0.39Hz

0.78Hz

1.56Hz

3.13Hz

6.25Hz

Figure 59. Typical Z-Axis Output vs. Temperature at Lower Data Rates,

Normalized to 100 Hz Output Data Rate, VS = 2.6 V

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