ADIS16488SLASHPCBZ datasheet(16/36 Pages) AD

16 / 36 page

ADIS16488

Data Sheet

Rev. B | Page 16 of 36

The registers that use the x_DELTANG_LOW format provide

additional resolution for the gyroscope measurements (see

Table 28, Table 29, and Table 30). The MSB has a weight of

~0.011° (720°/216), and each subsequent bit carries a weight of

½ of the previous one.

Table 28. X_DELTANG_LOW (Page 0, Base Address = 0x40)

Bits

Description

[15:0]

X-axis delta angle data; additional resolution bits

Table 29. Y_DELTANG_LOW (Page 0, Base Address = 0x44)

Bits

Description

[15:0]

Y-axis delta angle data; additional resolution bits

Table 30. Z_DELTANG_LOW (Page 0, Base Address = 0x48)

Bits

Description

[15:0]

Z-axis delta angle data; additional resolution bits

DELTA VELOCITY

The delta velocity outputs represent an integration of the

accelerometer measurements and use the following formula

for all three axes (x-axis displayed):

(

)

RATE

DEC

Δt

;

∆

where:

ax is the accelerometer, x-axis.

ΔtS is the time between samples.

When using the internal sample clock, fS is equal to 2.46 kHz.

When using the external clock option, the time between samples

is the time between active edges on the input clock signal, as

measured by the internal clock (252 MHz). See Table 55 for

more information on the DEC_RATE register. The registers

that use the x_DELTVEL_OUT format are the primary registers

for the delta velocity calculations. When processing data from

these registers, use a 16-bit, twos complement data format (see

Table 31, Table 32, and Table 33). Table 34 provides

x_DELTVEL_OUT digital coding examples.

Table 31. X_DELTVEL_OUT (Page 0, Base Address = 0x4E)

Bits

Description

[15:0]

X-axis delta velocity data; twos complement,

±200 m/sec range, 0 m/sec = 0x0000

1 LSB = 200 m/sec ÷ (215 – 1) = ~6.104 mm/sec

Table 32. Y_DELTVEL_OUT (Page 0, Base Address = 0x52)

Bits

Description

[15:0]

Y-axis delta velocity data; twos complement,

±200 m/sec range, 0 m/sec = 0x0000

1 LSB = 200 m/sec ÷ (215 − 1) = ~6.104 mm/sec

Table 33. Z_DELTVEL_OUT (Page 0, Base Address = 0x56)

Bits

Description

[15:0]

Z-axis delta velocity data; twos complement,

±200 m/sec range, 0 m/sec = 0x0000

1 LSB = 200 m/sec ÷ (215 − 1) = ~6.104 mm/sec

Table 34. x_DELTVEL_OUT, Data Format Examples

Velocity (m/sec)

Decimal

Hex

Binary

+160 × (215 − 1)/215

+32,767

0x7FFF

0111 1111 1111 1111

+400/215

0x0002

0000 0000 0000 0010

+200/215

0x0001

0000 0000 0000 0001

0x0000

0000 0000 0000 0000

−200/215

−1

0xFFFF

1111 1111 1111 1111

−400/215

−2

0xFFFE

1111 1111 1111 1110

−160

−32,768

0x8000

1000 0000 0000 0000

The registers that use the x_DELTVEL_LOW naming format

provide additional resolution for the gyroscope measurements

(see Table 35, Table 36, and Table 37). The MSB has a weight

of ~3.052 mm/sec (200 m/sec ÷ 216), and each subsequent bit

carries a weight of ½ of the previous one.

Table 35. X_DELTVEL_LOW (Page 0, Base Address = 0x4C)

Bits

Description

[15:0]

X-axis delta velocity data; additional resolution bits

Table 36. Y_DELTVEL_LOW (Page 0, Base Address = 0x50)

Bits

Description

[15:0]

Y-axis delta velocity data; additional resolution bits

Table 37. Z_DELTVEL_LOW (Page 0, Base Address = 0x54)

Bits

Description

[15:0]

Z-axis delta velocity data; additional resolution bits

ADIS16488/PCBZ Datasheet(PDF) 16 Page - Analog Devices

ADIS16488/PCBZ Datasheet(HTML) 16 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

Datasheet Download

Link URL