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ADXRS401 Datasheet(Arkusz danych) 9 Page - Analog Devices

Numer części ADXRS401
Szczegółowy opis  -75/s Single Chip Yaw Rate Gyro with Signal Conditioning
Pobierz  12 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
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ADXRS401
Rev. 0 | Page 9 of 12
SETTING BANDWIDTH
External capacitors CMID and COUT are used in combination
with on-chip resistors to create two low-pass filters to limit the
bandwidth of the ADXRS401’s rate response. The –3 dB
frequency set by ROUT and COUT is:
(
)
OUT
OUT
OUT
C
R
π
2
1/
f
×
×
×
=
This frequency can be well controlled since ROUT has been
trimmed during manufacturing to be 180 kΩ ±1%. Any external
resistor applied between the RATEOUT (1B, 2A) and SUMJ
(1C, 2C) pins will result in:
() (
EXT
EXT
OUT
R
180
/
R
180
R
+
×
=
)
The −3 dB frequency is set by RSEN (the parallel combination
of RSEN1 and RSEN2) at about 4.5 kΩ nominal. CMID is less well
controlled, because RSEN1 and RSEN2 have been used to trim the
rate sensitivity during manufacturing and have a ±35%
tolerance. Its primary purpose is to limit the high frequency
demodulation artifacts from saturating the final amplifier stage.
Thus, this pole of nominally 400 Hz @ 0.1 µF need not be
precise. Lower frequency is preferable, but its variability usually
requires it to be about 10 times greater (in order to preserve
phase integrity) than the well-controlled output pole. In general,
both −3 dB filter frequencies should be set as low as possible to
reduce the amplitude of these high frequency artifacts, as well as
to reduce the overall system noise.
INCREASING MEASUREMENT RANGE
To increase the full-scale measurement range of the ADXRS401,
place an external resistor between the RATEOUT (1B, 2A) and
SUMJ (1C, 2C) pins. This parallels the internal ROUT resistor that
is factory-trimmed to 180 kΩ.
For example, a 330 kΩ external resistor gives approximately
10mV/°/sec sensitivity and a commensurate ∼50% increase in
the full-scale range. This is effective for up to a 4× increase in
the full-scale range. (The minimum value of the parallel resistor
allowed is 45 kΩ.) Beyond this amount of external sensitivity
reduction, the internal circuitry headroom requirements
prevent further increase in the linear full-scale output range.
The drawbacks of modifying the full-scale range are the
additional output null drift (as much as 2°/sec over
temperature) and the readjustment of the initial null bias. See
Null Adjust section and Application Note AN-625 for details.
TEMPERATURE OUTPUT AND CALIBRATION
It is common practice to temperature-calibrate gyros to
improve their overall accuracy. The ADXRS401 has a
temperature-proportional voltage output that provides input to
such a calibration method. The voltage at TEMP (3F, 3G) is
nominally 2.5 V at 27°C and has a PTAT (proportional to
absolute temperature) characteristic of 8.4 mV/°C. Note that the
TEMP output circuitry is limited to 50 µA source current.
Limiting the bandwidth of the device reduces the flat-band
noise during the calibration process, improving the
measurement accuracy at each calibration point.
5G
4G
3A
5V
2G
1F
7F
6A
7D
7C
7B
1C
4A
5A
7E
6G
1D
2A
1E
3G
1B
PDD
12V
+
ADXRS401
1
µF
22nF
100nF
22nF
CP2
CP1
PGND
CP4
CP3
CP5
CHARGE PUMP/REG.
TEMP
PTAT
RATE-
OUT
2.5V
π
DEMOD
RATE
SENSOR
SELF
TEST
100nF
100nF
CMID
AGND
AVCC
ST1
ST2
CORIOLIS SIGNAL CHANNEL
SSEN2
RSEN1
COUT
ROUT
180k
Ω 1%
9kΩ ±35% 9kΩ ±35%
SUMJ
2.5V REF
RESONATOR LOOP
Figure 15. Block Diagram with External Components




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