Analog Devices ADXSR 614 Service Manual

V

±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 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

Navigation systems
Inertial measurement units
Platform stabilization
Robotics

ADXRS614

GENERAL DESCRIPTION

T

he ADXRS614 is a complete angular rate sensor (gyroscope)
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.
Two digital self-test inputs electromechanically excite the sensor
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)

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 SUM J RATEOUT

25kΩ

@ 25°C

100nF

AC

AMP

RATIO

25kΩ

C

OUT

Figure 1. ADXRS614 Block Diagram

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: [phone] www.analog.com
Fax: [phone] ©2007 Analog Devices, Inc. All rights reserved.

ADXRS614

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

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

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
2000 g and can exceed the absolute maximum rating of the
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 Increases with Clockwise Rotation

ESD CAUTION

RATE OUT

VCC = 5V

+

7

1

GND

V

RATIO

/2

4.75V

RATE IN

0.25V

06748-002

Rev. 0 | Page 4 of 12