ADXL362BCCZ-R2 datasheet(14/44 Pages) AD

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ADXL362

Data Sheet

Rev. B | Page 14 of 44

Current consumption varies somewhat with output data rate as

shown in Figure 30, remaining below 5.0 µA over the entire

range of data rates and operating voltages.

OUTPUT DATA RATE (Hz)

100

200

300

400

VS = 1.6V

VS = 2.0V

VS = 2.5V

VS = 3.0V

VS = 3.5V

Figure 30. Current Consumption vs. Output Data Rate at Several

Supply Voltages

Antialiasing

The analog-to-digital converter (ADC) of the ADXL362 samples

at the (user selected) output data rate. In the absence of anti-

aliasing filtering, it aliases any input signals whose frequency is

more than half the data rate. To mitigate this, a two-pole low-

pass filter is provided at the input of the ADC.

The user can set this antialiasing filter to a bandwidth that is at

½ the data rate or ¼ the data rate. Setting the antialiasing filter

pole to ½ of the output data rate provides less aggressive

antialiasing filtering, but maximizes bandwidth and is adequate

for most applications. Setting the pole to ¼ of the data rate

reduces bandwidth for a given data rate, but provides more

aggressive antialiasing.

The antialiasing filter of the ADXL362 defaults to the more

conservative setting, where bandwidth is set to one-fourth the

output data rate.

POWER/NOISE TRADEOFF

The ADXL362 offers a few options for decreasing noise at the

expense of only a small increase in current consumption.

The noise performance of the ADXL362 in normal operation,

typically 7 LSB rms at 100 Hz bandwidth, is adequate for most

applications, depending upon bandwidth and the desired reso-

lution. For cases where lower noise is needed, the ADXL362

provides two lower noise operating modes that trade reduced

noise for a somewhat higher current consumption.

Table 7 lists the current consumption and noise densities obtained

for normal operation and the two lower noise modes at a typical

2.0 V supply.

Table 7. Noise and Current Consumption: Normal Operation,

Low Noise Mode, and Ultralow Noise Mode @ VS = 2.0 V,

ODR = 100 Hz

Mode

Noise

(µg/√Hz)

Typical

Current

Consumption (µA)

Typical

Normal Operation

550

1.8

Low Noise

400

3.3

Ultralow Noise

250

Operating the ADXL362 at a higher supply voltage also decreases

noise. Table 8 lists the current consumption and noise densities

obtained for normal operation and the two lower noise modes

at the highest recommended supply, 3.3 V.

Table 8. Noise and Current Consumption: Normal Operation,

Low Noise Mode, and Ultralow Noise Mode @ VS = 3.3 V,

ODR = 100 Hz

Mode

Noise

(µg/√Hz)

Typical

Current

Consumption (µA)

Typical

Normal Operation

380

2.7

Low Noise

280

4.5

Ultralow Noise

175

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