Analog Devices ADXRS300 b Datasheet

±300°/s Single Chip Yaw Rate

FEATURES

Complete rate gyroscope on a single chip
Z-axis (yaw rate) response
High vibration rejection over wide frequency
2000 g powered shock survivability
Self-test on digital command
Temperature sensor output
Precision voltage reference output
Absolute rate output for precision applications
5 V single-supply operation
Ultrasmall and light (< 0.15 cc, < 0.5 gram)

APPLICATIONS

Vehicle chassis rollover sensing
Inertial measurement units
Platform stabilization

AVCC

ST1

ST2

5G

SELF
TEST

4G

3A

Gyro with Signal Conditioning

GENERAL DESCRIPTION

The ADXRS300 is a complete angular rate sensor (gyroscope)
that uses Analog Devices’ 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 (see Figure 4). 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
(see Figure 5).

A precision reference and a temperature output are also
provided for compensation techniques. Two digital self-test
inputs electromechanically excite the sensor to test proper
operation of both sensors and the signal conditioning circuits.
The ADXRS300 is available in a 7 mm × 7 mm × 3 mm BGA
chip-scale package.

FUNCTIONAL BLOCK DIAGRAM

–

+

5V

100nF 100nF

CMID

1D

R

SEN1

≈

7k

Ω

±

35%

RATE

SENSOR

AGND

2G 1F

CORIOLIS SIGNAL CHANNEL

π DEMOD

RESONATOR LOOP

ADXRS300

C

OUT

SUMJ

1C

R

OUT

R

≈

7k

Ω

SEN2

180k

Ω

1%

±

35%

1B

2A

RATEOUT

CHARGE PUMP/REG.

22nF

PDD

CP1

100nF

4A 5A 7E 6G

CP2

ADXRS300

Rev. B

Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other 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.

7F 6A 7D7C7B

PGND CP4

Figure 1.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] © 2004 Analog Devices, Inc. All rights reserved.

12V

2.5V REF

CP3 CP5

22nF

PTAT

47nF

1E

2.5V

3G

TEMP

ADXRS300

TABLE OF CONTENTS

Specifications..................................................................................... 3

Increasing Measurement Range ..................................................7

Absolute Maximum Ratings............................................................ 4

Rate Sensitive Axis........................................................................ 4

ESD Caution.................................................................................. 4

Pin Configuration and Function Descriptions............................. 5

Theory of Operation ........................................................................ 6

Supply and Common Considerations ....................................... 6

Setting Bandwidth ........................................................................ 7

REVISION HISTORY

3/04—Data Sheet Changed from Rev. A to Rev. B

Updated Format..................................................................Universal

Changes to Table 1 Conditions....................................................... 3

Added Evaluation Board to Ordering Guide................................ 8

3/03—Data Sheet Changed from Rev. 0 to Rev. A

Edit to Figure 3.................................................................................. 5

Using the ADXRS300 with a Supply-Ratiometric ADC ..........7

Null Adjust .....................................................................................7

Self-Test Function .........................................................................7

Continuous Self-Test.....................................................................7

Outline Dimensions..........................................................................8

Ordering Guide .............................................................................8

Rev. B | Page 2 of 8

ADXRS300

SPECIFICATIONS

@TA = 25°C, VS = 5 V, Angular Rate = 0°/s, Bandwidth = 80 Hz (C

Table 1.

Parameter Conditions

SENSITIVITY Clockwise rotation is positive output

Dynamic Range2 Full-scale range over specifications range ±300 °/s
Initial @25°C 4.6 5 5.4 mV/°/s
Over Temperature3 V

= 4.75 V to 5.25 V 4.6 5 5.4 mV/°/s

S

Nonlinearity Best fit straight line 0.1 % of FS

NULL

Initial Null 2.3 2.50 2.7 V
Over Temperature3 V

= 4.75 V to 5.25 V 2.3 2.7 V

S

Turn-On Time Power on to ±½°/s of final 35 ms
Linear Acceleration Effect Any axis 0.2 °/s/g
Voltage Sensitivity VCC = 4.75 V to 5.25 V 1 °/s/V

NOISE PERFORMANCE

Rate Noise Density @25°C 0.1

FREQUENCY RESPONSE

3 dB Bandwidth (User Selectable)4 22 nF as comp cap (see the Setting Bandwidth section) 40 Hz
Sensor Resonant Frequency 14 kHz

SELF-TEST INPUTS

ST1 RATEOUT Response5 ST1 pin from Logic 0 to 1 –150 –270 –450 mV
ST2 RATEOUT Response5 ST2 pin from Logic 0 to 1 +150 +270 +450 mV
Logic 1 Input Voltage Standard high logic level definition 3.3 V
Logic 0 Input Voltage Standard low logic level definition 1.7 V
Input Impedance To common 50 kΩ

TEMPERATURE SENSOR

V

at 298°K 2.50 V

OUT

Max Current Load on Pin Source to common 50 µA
Scale Factor Proportional to absolute temperature 8.4 mV/°K

OUTPUT DRIVE CAPABILITY

Output Voltage Swing I

= ±100 µA 0.25 VS – 0.25 V

OUT

Capacitive Load Drive 1000 pF

2.5 V REFERENCE
Voltage Value 2.45 2.5 2.55 V
Load Drive to Ground Source 200 µA
Load Regulation 0 < I

< 200 µA 5.0 mV/mA

OUT

Power Supply Rejection 4.75 VS to 5.25 VS 1.0 mV/V
Temperature Drift Delta from 25°C 5.0 mV

POWER SUPPLY

Operating Voltage Range 4.75 5.00 5.25 V
Quiescent Supply Current 6.0 8.0 mA

TEMPERATURE RANGE

Specified Performance Grade A Temperature tested to max and min specifications –40 +85 °C

= 0.01 µF), ±1g, unless otherwise noted.

OUT

Min

ADXRS300ABG

1

Typ Max1

Unit

°/s/√Hz

1

All minimum and maximum specifications are guaranteed. Typical specifications are not tested or guaranteed.

2

Dynamic range is the maximum full-scale measurement range possible, including output swing range, initial offset, sensitivity, offset drift, and sensitivity drift at

5 V supplies.

3

Specification refers to the maximum extent of this parameter as a worst-case value of T

4

Frequency at which response is 3 dB down from dc response with specified compensation capacitor value. Internal pole forming resistor is 180 kΩ. See the Setting

Bandwidth section.

5

Self-test response varies with temperature. See the Self-Test Function section for details.

Rev. B | Page 3 of 8

or T

MAX

.

MIN