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ADXRS290 Datasheet(Arkusz danych) 11 Page - Analog Devices

Numer części ADXRS290
Szczegółowy opis  Ultralow Noise, Dual-Axis MEMS Gyroscope
Pobierz  19 Pages
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Data Sheet
ADXRS290
APPLICATIONS INFORMATION
APPLICATION CIRCUIT
The ADXRS290 application circuit is shown in Figure 24. The
primary communications port is the 4-wire SPI interface. For
this device, external pull-up/pull-down resistors are not required
for the SPI interface, and these pins can be connected directly to
the system microcontroller. Four capacitors are required for
proper operation of the device. For optimum device performance,
separate the capacitors placed on the VS, VDDI/O, VREG, and CP pins.
SCLK
SYNC/ASEL
CP
GND
VS
PDMX
SENS
AST
VDD I/O
VREG
1
2
3
4
5
14
13
12
11
10
TOP VIEW
(TERMINAL SIDE DOWN)
Not to Scale
ADXRS290
2.7V TO
5.25V
2.7V TO
5.25V
CREG
1µF
CCP
1µF
50V
CS
1µF
CI/O
1µF
SPI BUS
Figure 24. Recommended Application Circuit
POWER SUPPLY DECOUPLING
In many applications, bypass capacitors at VS, VREG, and VDD I/O
(as shown in Figure 24) placed close to the ADXRS290 supply
pins adequately decouple the gyroscope from noise on the power
supply. However, in applications where noise is present at the
internal clock frequency, or any harmonic thereof, additional
care in power supply bypassing is required because this noise
may cause errors in angular rate measurement. If additional
decoupling is necessary, a 10 Ω resistor or ferrite bead in series
with VS and an additional larger bypass capacitor (2.2 µF or
greater) at VS may be helpful.
Ensure that the connection from the ADXRS290 ground to
the power supply ground be low impedance because noise
transmitted through ground has an effect similar to noise
transmitted through VS.
POWER SEQUENCING
The interface voltage level is set with the interface supply voltage
VDD I/O, which must be present to ensure that the ADXRS290
does not create a conflict on the communications bus. For single-
supply operation, VDDI/O can be the same as the main supply (VS).
Conversely, in a dual-supply application, VDD I/O can differ from
VS to accommodate the desired interface voltage. When VS is
applied, the device enters standby state, where power consumption
is minimized, and the device waits for VDD I/O to be applied and
for a command to enter measurement mode. Measurement mode
is activated by setting Bit B1 in Register 0x10 (POWER_CTL).
Clear this bit to return the device to a standby state.
In standby mode, the current consumption is reduced to 80 µA
(typical). In standby mode, only single-address SPI transactions
are performed, which includes reading from or writing to a single
register, but does not include writing to or reading from several
registers in one command. In standby mode, the gyroscope does
not respond to rate outputs. Transition time to measurement mode
where offsets settle to within ±1°/s of the final value is <100 ms.
SETTING BANDWIDTH
The ADXRS290 includes an internal configurable band-pass filter.
Both the high-pass and low-pass poles of the filter are adjustable, as
shown in Table 5 and Table 6. The filter frequency response is
shown in Figure 25 and Figure 26. The group delay of the
wideband filter option is less than 0.5 ms (see Figure 18 for filter
delay). At power-up, the default condition for the filters is dc for
the high-pass filter and 480 Hz for the low-pass filter.
Table 5. Low-Pass Filter Pole Locations
Bit 2 Filter
Bit 1 Filter
Bit 0 Filter
Frequency (Hz)
0
0
0
480 (Default)
0
0
1
320
0
1
0
160
0
1
1
80
1
0
0
56.6
1
0
1
40
1
1
0
28.3
1
1
1
20
Table 6. High-Pass Filter Pole Locations
Bit 7
Filter
Bit 6
Filter
Bit 5
Filter
Bit 4
Filter
Frequency
(Hz)
0
0
0
0
All pass
(default)
0
0
0
1
0.011
0
0
1
0
0.022
0
0
1
1
0.044
0
1
0
0
0.087
0
1
0
1
0.175
0
1
1
0
0.350
0
1
1
1
0.700
1
0
0
0
1.400
1
0
0
1
2.800
1
0
1
0
11.30
Rev. A | Page 11 of 19




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