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ADIS16488A Datasheet(PDF) 17 Page - Analog Devices

Part # ADIS16488A
Description  Tactical Grade, Ten Degrees of Freedom Inertial Sensor
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
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ADIS16488A Datasheet(HTML) 17 Page - Analog Devices

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ADIS16488A
Rev. C | Page 17 of 35
Table 30. Y_DELTANG_LOW(Page0, Base Address = 0x44)
Bits
Description
[15:0]
Y-axis delta angle data; additional resolution bits
Table 31. Z_DELTANG_LOW (Page 0, Base Address = 0x48)
Bits
Description
[15:0]
Z-axis delta angle data; additional resolutionbits
DELTA VELOCITY
The registers that usethe x_DELTVEL_OUTformat arethe
primary registers for the deltavelocity calculations. When
processing data fromtheseregisters, use a 16-bit, twos
complement data format (see Table 32, Table33, and Table 34).
Table 35 provides x_DELTVEL_OUT digital coding examples.
The delta velocity outputs representan integration of the
accelerometer measurements and use thefollowing formula for
all three axes (x-axis displayed):
(
)
=
+
+ +
×
=
1
0
1
,
,
,
2
1
D
d
d
D
n
x
d
D
n
x
S
D
n
x
a
a
f
V
where:
D is the decimation rate = DEC_RATE+ 1.
fS is the sample rate.
d is the incremental variable in the summation formula.
ax is the x-axis linear acceleration.
n is the sample time, prior to the decimation filter.
When using the internal sampleclock, fS is equal to 2460 SPS.
When using theexternal clockoption, fS is equal to thefrequency
of the external clock, which is limited to a minimum of 2 kHz,
to prevent overflowin the x_DELTVEL_xxx registers at high
rotation rates. See Table56 and Figure 20 for moreinformation
on the DEC_RATEregister (decimation filter).
Table 32. X_DELTVEL_OUT (Page 0, Base Address = 0x4E)
Bits
Description
[15:0]
X-axis delta velocitydata; twoscomplement, ±200 m/sec
range, 0 m/sec = 0x0000
1 LSB = 200 m/sec ÷ 215 = ~6.104 mm/sec
Table 33. Y_DELTVEL_OUT (Page 0, Base Address = 0x52)
Bits
Description
[15:0]
Y-axis deltavelocitydata; twoscomplement, ±200 m/sec
range, 0 m/sec = 0x0000
1 LSB = 200 m/sec ÷ 215 = ~6.104 mm/sec
Table 34. Z_DELTVEL_OUT (Page 0, Base Address = 0x56)
Bits
Description
[15:0]
Z-axisdelta velocity data; twos complement, ±200 m/sec
range, 0 m/sec = 0x0000
1 LSB = 200 m/sec ÷ 215 = ~6.104 mm/sec
Table 35. x_DELTVEL_OUT, Data FormatExamples
Velocity (m/sec)
Decimal
Hex
Binary
+200 × (215 − 1)/215
+32,767
0x7FFF
0111 1111 1111 1111
+400/215
+2
0x0002
0000 0000 0000 0010
+200/215
+1
0x0001
0000 0000 0000 0001
0
0
0x0000
0000 0000 0000 0000
−200/215
−1
0xFFFF
1111 1111 1111 1111
−400/215
−2
0xFFFE
1111 1111 1111 1110
−200
−32,768
0x8000
1000 0000 0000 0000
The x_DELTVEL_LOWregisters(see Table36, Table 37, and
Table 38)provideadditional resolutionbitsforthedelta velocityand
combinewith thex_DELTVEL_OUT registerstoprovidea 32-bit,
twos complement number. TheMSBin thex_DELTVEL_LOW
registers haveaweightof~3.052 mm/sec(200 m/sec÷ 216), andeach
subsequent bit carriesa weight of½ of thepreviousone.
Table 36. X_DELTVEL_LOW(Page 0, Base Address = 0x4C)
Bits
Description
[15:0]
X-axis delta velocity data; additional resolution bits
Table 37. Y_DELTVEL_LOW (Page 0, Base Address = 0x50)
Bits
Description
[15:0]
Y-axis delta velocity data; additional resolution bits
Table 38. Z_DELTVEL_LOW(Page 0, Base Address = 0x54)
Bits
Description
[15:0]
Z-axis delta velocity data; additional resolutionbits
MAGNETOMETERS
The registers that usethe x_MAGN_OUT format aretheprimary
registersforthemagnetometermeasurements. When processing
data fromthese registers, usea 16-bit, twos complement data
format. Table 39, Table 40, and Table 41 providethenumerical
format for each register,and Table42 providesx_MAGN_OUT
digital coding examples.
Table 39. X_MAGN_OUT (Page 0, Base Address = 0x28)
Bits
Description
[15:0]
X-axis magnetometer data; twos complement,
±3.2767 gauss range, 0 gauss = 0x0000,
1 LSB = 0.1 mgauss
Table 40. Y_MAGN_OUT (Page 0, Base Address = 0x2A)
Bits
Description
[15:0]
Y-axis magnetometer data; twos complement,
±3.2767 gauss range, 0 gauss = 0x0000,
1 LSB = 0.1 mgauss
Table 41. Z_MAGN_OUT (Page 0, Base Address = 0x2C)
Bits
Description
[15:0]
Z-axis magnetometer data; twos complement,
±3.2767 gauss range, 0 gauss = 0x0000,
1 LSB = 0.1 mgauss


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