Zakładka z wyszukiwarką danych komponentów
Selected language     Polish  ▼
Nazwa części
         Szczegóły


ADXRS613BBGZ-RL Datasheet(Arkusz danych) 9 Page - Analog Devices

Numer części ADXRS613BBGZ-RL
Szczegółowy opis  ±150°/sec Yaw Rate Gyroscope
Pobierz  12 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo 

 
 9 page
background image
ADXRS613
Rev. 0 | Page 9 of 12
THEORY OF OPERATION
The ADXRS613 operates on the principle of a resonator
gyroscope. Two polysilicon sensing structures each contain a
dither frame that is electrostatically driven to resonance,
producing the necessary velocity element to produce a Coriolis
force while rotating. At two of the outer extremes of each frame,
orthogonal to the dither motion, are movable fingers that are
placed between fixed pickoff fingers to form a capacitive pickoff
structure that senses Coriolis motion. The resulting signal is fed
to a series of gain and demodulation stages that produce the
electrical rate signal output. The dual-sensor design rejects
external g forces and vibration. Fabricating the sensor with the
signal conditioning electronics preserves signal integrity in
noisy environments.
The electrostatic resonator requires 18 V to 20 V for operation.
Because only 5 V are typically available in most applications, a
charge pump is included on-chip. If an external 18 V to 20 V
supply is available, the two capacitors on CP1 through CP4 can
be omitted, and this supply can be connected to the CP5 pin
(6D, 7D). Note that CP5 should not be grounded when power is
applied to the ADXRS613. Although no damage occurs, under
certain conditions, the charge pump may fail to start up after
the ground is removed without first removing power from the
ADXRS613.
SETTING BANDWIDTH
External Capacitor COUT is used in combination with the
on-chip ROUT resistor to create a low-pass filter to limit the
bandwidth of the ADXRS613 rate response. The –3 dB
frequency set by ROUT and COUT is
()
OUT
OUT
OUT
C
R
f
×
×
×
=
π
2
1
and can be well controlled because ROUT has been trimmed
during manufacturing to be 180 kΩ ± 1%. Any external resistor
applied between the RATEOUT pin (1B, 2A) and SUMJ pin
(1C, 2C) results in:
(
)
()
EXT
EXT
OUT
R
R
R
+
×
=
180
180
In general, an additional hardware or software filter is added to
attenuate high frequency noise arising from demodulation
spikes at the gyroscope’s 14 kHz resonant frequency (the noise
spikes at 14 kHz can be clearly seen in the power spectral
density curve shown in Figure 21). Typically, this additional
filter’s corner frequency is set to greater than 5× the required
bandwidth to preserve good phase response.
Figure 22 shows the effect of adding a 250 Hz filter to the
output of an ADXRS613 set to 40 Hz bandwidth (as shown
in Figure 21). High frequency demodulation artifacts are
attenuated by approximately 18 dB.
0.1
0.01
0.000001
0.00001
0.0001
0.001
10
100k
1k
100
(Hz)
10k
Figure 22. Noise Spectral Density with Additional 250 Hz Filter
TEMPERATURE OUTPUT AND CALIBRATION
It is common practice to temperature-calibrate gyroscopes to
improve their overall accuracy. The ADXRS613 has a tempera-
ture proportional voltage output that provides input to such a
calibration method. The temperature sensor structure is shown
in Figure 23. The temperature output is characteristically
nonlinear, and any load resistance connected to the TEMP
output results in decreasing the TEMP output and temperature
coefficient. Therefore, buffering the output is recommended.
The voltage at the TEMP pin (3F, 3G) is nominally 2.5 V at
25°C and VRATIO = 5 V. The temperature coefficient is ~9 mV/°C
at 25°C. Although the TEMP output is highly repeatable, it has
only modest absolute accuracy.
VRATIO
RTEMP
RFIXED
VTEMP
Figure 23. ADXRS613 Temperature Sensor Structure
CALIBRATED PERFORMANCE
Using a 3-point calibration technique, it is possible to calibrate
the null and sensitivity drift of the ADXRS613 to an overall
accuracy of nearly 200°/hour. An overall accuracy of 40°/hour
or better is possible using more points.
Limiting the bandwidth of the device reduces the flat-band
noise during the calibration process, improving the measure-
ment accuracy at each calibration point.




Html Pages

1  2  3  4  5  6  7  8  9  10  11  12 


Datasheet Download



Powiązane numery części

Numer częściSzczegółowy opis komponentówHtml ViewProducent
ADIS16060Wide Bandwidth Yaw Rate Gyroscope with SPI 1 2 3 4 5 MoreAnalog Devices
ADXRS610±300°/sec Yaw Rate Gyro 1 2 3 4 5 MoreAnalog Devices
ADXRS612±250°/sec Yaw Rate Gyro 1 2 3 4 5 MoreAnalog Devices
ADXRS614±50°/s Yaw Rate Gyro 1 2 3 4 5 MoreAnalog Devices
ZL5006316K-Channel Digital Switch with High Jitter Tolerance Single Rate 32Mbps and 32 Inputs and 32 Output 1 2 3 4 5 MoreZarlink Semiconductor Inc
HA-2850_03470MHz Low Power High Slew Rate Operational Amplifier 1 2 3 4 5 MoreIntersil Corporation
ISL83070E_06±15kV ESD Protected 3.3V Full Fail-safe Low Power High Speed or Slew Rate Limited RS-485/RS-422 Transceivers 1 2 3 4 5 MoreIntersil Corporation
CS8421_0632-bit 192 kHz Asynchronous Sample Rate Converter 1 2 3 4 5 MoreCirrus Logic
MT9052828-Port Primary Rate Circuit Emulation AAL1 SAR 1 2 3 4 5 MoreZarlink Semiconductor Inc
AAT4282ADual Slew Rate Controlled Load Switch 1 2 3 4 5 MoreAdvanced Analogic Technologies

Link URL

Czy Alldatasheet okazała się pomocna?  [ DONATE ]  

O Alldatasheet   |   Reklama   |   Kontakt   |   Polityka prywatności   |   Dodaj do ulubionych   |   Linki   |   Lista producentów
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  , Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp  |   Russian : Alldatasheetru.com
Korean : Alldatasheet.co.kr   |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com  |   Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl