ADIS16COM1SLASHPCBZ datasheet(19/37 Pages) AD

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Preliminary Technical Data

ADIS16000/ADIS16229

Rev. PrA | Page 19 of 37

DYNAMIC RANGE/SENSITIVITY

The range of the ADIS16229 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 18, 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 19.

1000

2000

4000

5000

6000

FREQUENCY (Hz)

2g PEAK RESPONSE

14g PEAK RESPONSE

16g PEAK RESPONSE

18g PEAK RESPONSE

Figure 18. 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 19. Magnitude/Frequency Response (CAL_ENABLE[4] = 0)

Dynamic Range Settings

REC_CTRL2 (see Table 30) provides four range settings that

are associated with each sample rate option, SRx. The range options

that are referenced in REC_CTRL2 reflect the maximum dynamic

range, which occurs at the lower part of the frequency range and

does not account for the decrease in range (see Figure 18). For

example, set REC_CTRL2[5:4] = 10 (DIN = 0x9C20) to set the

peak acceleration (AMAX) to 10 g on the SR2 sample rate option.

These settings help optimize FFT precision and sensitivity when

monitoring lower magnitude vibrations. For each range setting

in Table 30, this stage scales the time domain data so that the

maximum value equates to 215 LSBs for time domain data and

216 LSBs for frequency domain data.

Note that the maximum range for each setting is 1 LSB smaller

than the listed maximum. For example, the maximum number

of codes in the frequency domain analysis is 216 − 1, or 65,535.

For example, when using a range setting of 1 g in one of the FFT

modes, the maximum measurement is equal to 1 g times 216 − 1,

divided by 216. See Table 31 for the resolution associated with

each setting and Figure 16 for the location of this operation in

the signal flow diagram. The real-time mode automatically uses

the 20 g range setting.

Table 30. REC_CTRL2

Page 1-6, Low Byte Address = 0x1C, Read/Write

Bits

Description (Default = 0x00FF)

[15:8]

Not used (don’t care)

[7:6]

Measurement range, SR3

00 = 1 g, 01 = 5 g, 10 = 10 g, 11 = 20 g

[5:4]

Measurement range, SR2

00 = 1 g, 01 = 5 g, 10 = 10 g, 11 = 20 g

[3:2]

Measurement range, SR1

00 = 1 g, 01 = 5 g, 10 = 10 g, 11 = 20 g

[1:0]

Measurement range, SR0

00 = 1 g, 01 = 5 g, 10 = 10 g, 11 = 20 g

Table 31. Range Settings and LSB Weights

Range Setting (g)

(REC_CTRL2[5:4])

Time Mode

(mg/LSB)

FFT Mode

(mg/LSB)

0 to 1

0.0305

0.0153

0 to 5

0.1526

0.0763

0 to 10

0.3052

0.1526

0 to 20

0.6104

0.3052

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