Analog Devices ADXSR 612 Service Manual
V
±250°/sec Yaw Rate Gyro
FEATURES
Complete rate gyroscope on a single chip
Z-axis (yaw rate) response
High vibration rejection over wide frequency
2000 g powered shock survivability
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
Vehicle chassis rollover sensing
Inertial measurement units
Platform stabilization
GENERAL DESCRIPTION
The ADXRS612 is a complete angular rate sensor (gyroscope)
that uses the Analog Devices, Inc. surface-micromachining
process to make a functionally complete and low cost angular
rate sensor integrated with all of the 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 can be used to lower
the scale factor. An external capacitor is used to set the bandwidth.
Other external capacitors are required for operation.
A temperature output is provided for compensation techniques.
Two digital self-test inputs electromechanically excite the sensor
to test proper operation of both the sensor and the signal conditioning circuits. The ADXRS612 is available in a 7 mm × 7 mm ×
3 mm BGA chip-scale package.
FUNCTIONAL BLOCK DIAGRAM
+5
(ADC REF)
ADXRS612
100nF
100nF
100nF
+5V
+5V
AV
CC
AGND
V
DD
PGND
ST2 ST1 TEMP V
SELF-TEST
AMP
22nF
MECHANICAL
SENSOR
CHARGE PUMP
AND VOLTAGE
REGULATOR
22nF
DRIVE
CP1 CP2 CP3 CP4 CP5 SUMJ RATEOUT
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.
25kΩ
@ 25°C
AC
AMP
100nF
RATIO
25kΩ
C
OUT
VGA
180kΩ ±1%
ADXRS612
DEMOD
06521-001
Figure 1.
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.
ADXRS612
TABLE OF CONTENTS
Features.............................................................................................. 1
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
3/07—Revision 0: Initial Version
Theory of Operation .........................................................................9
Setting Bandwidth.........................................................................9
Temperature Output and Calibration.........................................9
Calibrated Performance................................................................9
ADXRS612 and Supply Ratiometricity ................................... 10
Null Adjustment ......................................................................... 10
Self-Test Function ...................................................................... 10
Continuous Self-Test.................................................................. 10
Outline Dimensions....................................................................... 11
Ordering Guide .......................................................................... 11
Rev. 0 | Page 2 of 12
ADXRS612
SPECIFICATIONS
All minimum and maximum specifications are guaranteed. Typical specifications are not guaranteed. TA = −40°C to +105°C, VS = AVCC =
= 5 V, V
V
DD
Table 1.
Parameter Conditions
SENSITIVITY
Measurement Range
Initial and Over Temperature
Temperature Drift
Nonlinearity Best fit straight line 0.1 % of FS
1
NULL
Null −40°C to +105°C 2.15 2.5 2.85 V
Linear Acceleration Effect Any axis 0.1 °/sec/g
NOISE PERFORMANCE
Rate Noise Density
FREQUENCY RESPONSE
Bandwidth
Sensor Resonant Frequency 12 14.5 17 kHz
SELF-TEST
ST1 RATEOUT Response
ST2 RATEOUT Response ST2 pin from Logic 0 to Logic 1 300 525 750 mV
ST1 to ST2 Mismatch
Logic 1 Input Voltage 3.3 V
Logic 0 Input Voltage 1.7 V
Input Impedance To common 40 50 100 kΩ
TEMPERATURE SENSOR
V
at 25°C Load = 10 MΩ 2.35 2.5 2.65 V
OUT
Scale Factor
Load to V
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
Quiescent Supply Current 3.5 4.5 mA
TEMPERATURE RANGE
Specified Performance −40 +105 °C
1
Parameter is linearly ratiometric with V
2
Measurement range is 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 +25°C to +105°C.
4
Adjusted by external capacitor, C
5
Self-test mismatch is described as (ST2 + ST1)/((ST2 − ST1)/2).
6
Scale factor for a change in temperature from 25°C to 26°C. V
= AVCC, angular rate = 0°/sec, bandwidth = 80 Hz (C
RATIO
1
2
3
Clockwise rotation is positive output
Full-scale range over specifications range ±250 ±300 °/sec
−40°C to +105°C
±2 %
T
≤ 25°C
A
4
1
5
1
6
S
RATIO
. Reducing bandwidth below 0.01 Hz does not result in further noise improvement.
OUT
0.01 2500 Hz
ST1 pin from Logic 0 to Logic 1 −750 −525 −300 mV
−5
@ 25°C, V
RATIO
.
is ratiometric to V
TEMP
= 0.01 µF), I
OUT
= 100 µA, ±1 g, unless otherwise noted.
OUT
ADXRS612BBGZ
Min Typ Max
6.2 7.0 7.8 mV/°/sec
0.06
+5
= 5 V 9
. See the Temperature Output and Calibration section for more information.
RATIO
25
25
Unit
°/sec/√Hz
%
mV/°C
kΩ
kΩ
Rev. 0 | Page 3 of 12
ADXRS612
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
Acceleration (Any Axis, 0.5 ms)
Unpowered 2000 g
Powered 2000 g
VDD, AV
CC
V
AVCC
RATIO
–0.3 V to +6.0 V
ST1, ST2 AVCC
Output Short-Circuit Duration
Indefinite
(Any Pin to Common)
Operating Temperature Range −55°C to +125°C
Storage Temperature Range −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
2000 g and can exceed the absolute maximum rating of the
device. Care should be exercised in handling to avoid damage.
RATE SENSITIVE AXIS
This is a Z-axis rate-sensing device (also called a yaw ratesensing 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
LATERAL AXIS
Figure 2. RATEOUT Signal Increases with Clockwise Rotation
EF
+
1
7
VCC = 5V
GND
V
RATIO
RATE OUT
4.75V
/2
RATE IN
0.25V
ESD CAUTION
06521-002
Rev. 0 | Page 4 of 12
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