ANALOG DEVICES ADXRS614 Service Manual
V
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±50°/s Yaw Rate Gyro
FEATURES
Complete rate gyroscope on a single chip
Z-axis (yaw rate) response
High vibration rejection over wide frequency
2000 g pow
Ratiometric to referenced supply
5 V single-supply operation
105°C operation
Self-test on digital command
Ultrasmall and light (<0.15 cc, <0.5 gram)
Temperature sensor output
RoHS compliant
APPLICATIONS
Navigation systems
Inertial measurement units
Platform stabilization
Robotics
ered shock survivability
ADXRS614
GENERAL DESCRIPTION
he ADXRS614 is a complete angular rate sensor (gyroscope)
T
that uses the Analog Devices, Inc. surface-micromachining
process to create a functionally complete and low cost angular
rate sensor integrated with all required electronics on one chip.
The manufacturing technique for this device is the same high
volume BiMOS process used for high reliability automotive
airbag accelerometers.
The output signal, RATEOUT (1B, 2A), is a voltage proportional
to angular rate about the axis normal to the top surface of the
package. The output is ratiometric with respect to a provided
reference supply. A single external resistor between SUMJ and
RATEOUT can be used to lower the scale factor. An external
capacitor sets the bandwidth. Other external capacitors are
required for operation.
A temperature output is provided for compensation techniques.
wo digital self-test inputs electromechanically excite the sensor
T
to test proper operation of both the sensor and the signal
conditioning circuits. The ADXRS614 is available in a 7 mm ×
7 mm × 3 mm BGA chip scale package.
FUNCTIONAL BLOCK DIAGRAM
+5
(ADC REF)
+5V
AV
CC
100nF
AGND
+5V
V
DD
100nF
PGND
ST2 ST1 TEMP V
SELF-TEST
DRIVE
CP1 CP2 CP3 CP4 CP5 SUM J RATEOUT
MECHANICAL
AMP
SENSOR
CHARGE PUMP
AND VOLTAGE
REGULATOR
22nF
22nF
Figure 1. ADXRS614 Block Diagram
25kΩ
@ 25°C
100nF
AC
AMP
RATIO
25kΩ
C
OUT
VGA
200kΩ ±5%
100nF
ADXRS614
DEMOD
06748-001
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2007 Analog Devices, Inc. All rights reserved.
ADXRS614
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TABLE OF CONTENTS
Features .............................................................................................. 1
Theory of Operation .........................................................................9
Applications....................................................................................... 1
General Description......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
Rate Sensitive Axis ....................................................................... 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions............................. 5
Typical Performance Characteristics ............................................. 6
REVISION HISTORY
4/07—Revision 0: Initial Version
Setting Bandwidth.........................................................................9
Temperature Output and Calibration.........................................9
Calibrated Performance................................................................9
ADXRS614 and Supply Ratiometricity ......................................9
Null Adjustment ......................................................................... 10
Self-Test Function ...................................................................... 10
Continuous Self-Test.................................................................. 10
Outline Dimensions ....................................................................... 11
Ordering Guide .......................................................................... 11
Rev. 0 | Page 2 of 12
ADXRS614
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SPECIFICATIONS
All minimum and maximum specifications are guaranteed. Typical specifications are not guaranteed.
@T
= −40°C to +105°C, VS = AV
A
= 100 μA, ±1 g, unless otherwise noted.
I
OUT
Table 1.
Parameter Conditions
SENSITIVITY (Ratiometric)
Measurement Range
1
2
Initial and Over Temperature
Temperature Drift
3
Nonlinearity Best fit straight line 0.1 % of FS
NULL (Ratiometric)
1
Null −40°C to +105°C 2.5 V
Linear Acceleration Effect Any axis 0.1 °/sec/g
NOISE PERFORMANCE
Rate Noise Density
FREQUENCY RESPONSE
Bandwidth
4
Sensor Resonant Frequency 14.5 kHz
SELF-TEST (Ratiometric)1
ST1 RATEOUT Response
ST2 RATEOUT Response ST2 pin from Logic 0 to Logic 1 1.9 V
Logic 1 Input Voltage 0.8 × V
Logic 0 Input Voltage 0.2 × V
Input Impedance To common 50 kΩ
TEMPERATURE SENSOR (Ratiometric)
V
at 25°C Load = 100 MΩ 2.35 2.5 2.65 V
OUT
Scale Factor
Load to V
5
S
Load to Common
TURN-ON TIME Power on to ±½°/sec of final 50 ms
OUTPUT DRIVE CAPABILITY
Current Drive For rated specifications 200 μA
Capacitive Load Drive 1000 pF
POWER SUPPLY
Operating Voltage (VS) 4.75 5.00 5.25 V
V
Input 3 V
RATIO
Supply Current 3.5 5.0 mA
TEMPERATURE RANGE
Specified Performance
1
Parameter is linearly ratiometric with V
2
The maximum range possible, including output swing range, initial offset, sensitivity, offset drift, and sensitivity drift at 5 V supplies.
3
From +25°C to −40°C or from +25°C to +105°C.
4
Adjusted by external capacitor, COUT.
5
For a change in temperature from 25°C to 26°C. V
= V
CC
= 5 V, V
DD
= AVCC, angular rate = 0°/s, bandwidth = 80 Hz (C
RATIO
= 0.01 µF),
OUT
ADXRS614BBGZ
Min Typ Max
Unit
Clockwise rotation is positive output
Full-scale range over specifications range ±50 ±75 °/sec
22.5 25 27.5 mV/°/sec
±3 %
T
= 25°C
A
0.04
°/sec/√Hz
1 1000 Hz
ST1 pin from Logic 0 to Logic 1 −1.9 V
V
RATIO
V
RATIO
1
@25°C, V
= 5 V 9
RATIO
25
25
mV/°C
S
kΩ
kΩ
V
–40 +105 °C
.
RATIO
is ratiometric to V
TEMP
. See the Temperature Output and Calibration section for more details.
RATIO
Rev. 0 | Page 3 of 12
ADXRS614
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ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
Acceleration (Any Axis, 0.5 ms)
Unpowered, 2000 g
Powered 2000 g
V
AV
DD,
CC
V
RATIO
Output Short-Circuit Duration
–0.3 V to +6.0 V
AV
CC
Indefinite
(Any Pin to Common)
Operating Temperature Range –55°C to +125°C
Storage Temperature –65°C to +150°C
Stresses above those listed under the Absolute Maximum
Ratings may cause permanent damage to the device. This is a
stress rating only; functional operation of the device at these or
any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Drops onto hard surfaces can cause shocks of greater than
g and can exceed the absolute maximum rating of the
2000
device. Exercise care during handling to avoid damage.
RATE SENSITIVE AXIS
The ADXRS614 is a Z-axis rate-sensing device (also called a
yaw rate sensing device). It produces a positive going output
voltage for clockwise rotation about the axis normal to the
package top, that is, clockwise when looking down at the
package lid.
RATE
AXIS
LONGITUDI NAL
AXIS
ABCD G
A1
EF
LATERAL AXIS
Figure 2. RATEOUT Signal Increa
ESD CAUTION
RATE OUT
VCC = 5V
+
7
1
GND
/2
V
RATIO
ses with Clockwise Rotation
4.75V
RATE IN
0.25V
06748-002
Rev. 0 | Page 4 of 12
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