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ADIS16485 Datasheet(PDF) 20 Page - Analog Devices

Part # ADIS16485
Description  Tactical Grade, Six Degrees of Freedom Inertial Sensor
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADIS16485 Datasheet(HTML) 20 Page - Analog Devices

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ADIS16485
Data Sheet
DIGITAL SIGNAL PROCESSING
GYROSCOPES/ACCELEROMETERS
Figure 20 provides a signal flow diagram for all the components
and settings that influence the frequency response for the
accelerometers and gyroscopes. The sample rate for each
accelerometer and gyroscope is 9.84 kHz. Each sensor has its
own averaging/decimation filter stage that reduces the update
rate to 2.46 kSPS. When using the external sync clock option
(FNCTIO_CTRL[7:4], see Table 89), the input clock drives a
4-sample burst at a sample rate of 9.84 kSPS, which feeds into
the 4× averaging/decimation filter. This results in a data rate
that is equal to the input clock frequency.
AVERAGING/DECIMATION FILTER
The DEC_RATE register (see Table 49) provides user control for
the final filter stage (see Figure 20), which averages and decimates
the accelerometers, gyroscopes, delta angle, and delta velocity data.
The output sample rate is equal to 2460/(DEC_RATE + 1). When
using the external sync clock option (FNCTIO_CTRL[7:4], see
Table 89), replace the 2460 number in this relationship with the
input clock frequency. For example, turn to Page 3 (DIN = 0x8003),
and set DEC_RATE = 0x18 (DIN = 0x8C18, then DIN = 0x8D00)
to reduce the output sample rate to 98.4 SPS (2460 ÷ 25).
Table 49. DEC_RATE (Page 3, Base Address = 0x0C)
Bits
Description (Default = 0x0000)
[15:11]
Don’t care
[10:0]
Decimation rate, binary format, maximum = 2047,
see Figure 20 for impact on sample rate
MEMS
SENSOR
330Hz
÷4
2.46kHz, fs
GYROSCOPE
2-POLE: 404Hz, 757Hz
ACCELEROMETER
1-POLE: 330Hz
AVERAGE
DECIMATION
FILTER
SELECTABLE
FIR FILTER BANK
FILTR_BNK_0
FILTR_BNK_1
AVERAGE/DECIMATION FILTER
D = DEC_RATE[10:0] + 1
1
4
4
÷D
1
D
D
FIR
FILTER
BANK
fs
INTERNAL
CLOCK
9.84kHz
DIOx
OPTIONAL INPUT CLOCK
FNCTIO_CTRL[7] = 1
fs < 2400Hz
NOTES
1. WHEN FNCTIO_CTRL[7] = 1, EACH CLOCK PULSE ON THE DESIGNATED DIOx LINE (FNCTIO_CTRL[5:4]) STARTS A 4-SAMPLE BURST,
AT A SAMPLE RATE OF 9.84kHz. THESE FOUR SAMPLES FEED INTO THE 4x AVERAGE/DECIMATION FILTER, WHICH PRODUCES A
DATA RATE THAT IS EQUAL TO THE INPUT CLOCK FREQUENCY.
Figure 20. Sampling and Frequency Response Signal Flow
Rev. E | Page 20 of 32


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