ADIS16228SLASHPCBZ datasheet(14/28 Pages) AD

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ADIS16228

Data Sheet

Rev. B | Page 14 of 28

DYNAMIC RANGE/SENSITIVITY

The range of the ADIS16228 accelerometers depends on the

frequency of the vibration. The accelerometers have a self-

resonant frequency of 5.5 kHz, and the signal conditioning

circuit applies a single-pole, low-pass filter (2.5 kHz) to the

response. The self-resonant behavior of the accelerometer

influences the relationship between vibration frequency and

dynamic range, as shown in Figure 16, which displays the

response to peak input amplitudes, assuming a sinusoidal

vibration signature at each frequency. The accelerometer

resonance and low-pass filter also influence the magnitude

response, as shown in Figure 17.

Frequency Response Correction

The CAL_ENABLE register provides an on/off control bit for

a magnitude/frequency correction that extends the flatness

(5%) of this response up to 5 kHz. Set CAL_ENABLE[4] = 1

(DIN = 0xFA10) to enable this function, which produces a

magnitude/frequency response like the one that is shown in

Figure 18. Set CAL_ENABLE[4] = 0 to remove this correction,

and use a response that reflects the curve that is shown in

Figure 17. Note that this operation does not expand the dynamic

range of the sensor, but it can simplify the process of setting

spectral alarm limits and any other postprocessing routines.

Table 13. CAL_ENABLE (Base Address = 0x7A), Read/Write

Bits

Description (Default = 0x00FF)

[15:5]

Not used (don’t care)

Frequency/flatness calibration enable

1 = enable (see Figure 18)

0 = disable (see Figure 17)

[3:0]

Not used (don’t care)

1000

2000

4000

5000

6000

FREQUENCY (Hz)

2g PEAK RESPONSE

14g PEAK RESPONSE

16g PEAK RESPONSE

18g PEAK RESPONSE

Figure 16. Peak Magnitude vs. Frequency

100

1000

5000

MEAN

FREQUENCY (Hz)

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

–3σ

+3σ

Figure 17. Magnitude/Frequency Response (CAL_ENABLE[4] = 0)

100

1000

5000

MEAN

FREQUENCY (Hz)

0.9

1.0

1.1

–3σ

+3σ

Figure 18. Magnitude/Frequency Response (CAL_ENABLE[4] = 1)

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