Analog Devices ADXRS300 b Datasheet

±300°/s Single Chip Yaw Rate Gyro with Signal Conditioning

ADXRS300

FEATURES

GENERAL DESCRIPTION

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

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 –

COUT

100nF

100nF

AVCC

AGND

CMID

SUMJ

3A

2G

1F

1D

1C

ST1

5G

SELF

ROUT

ST2

4G

CORIOLIS SIGNAL CHANNEL

TEST

π DEMOD

RSEN1

RSEN2

180kΩ 1%

RATE

1B

≈7kΩ ±35%

≈7kΩ ±35%

SENSOR

RATEOUT

RESONATOR LOOP

2A

2.5V REF

1E

2.5V

PTAT

3G

TEMP

12V

CHARGE PUMP/REG.

PDD

4A

5A

7E

6G

7F

6A

7B

7C

7D

CP2

22nF

CP1

PGND

CP4

CP3

CP5

47nF

ADXRS300

100nF

22nF

Figure 1.

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.

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.

ADXRS300

TABLE OF CONTENTS
Specifications.....................................................................................	3
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

Increasing Measurement Range ..................................................	7
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 (COUT = 0.01 µF), ±1g, unless otherwise noted.

Table 1.

				ADXRS300ABG
	Parameter	Conditions				Unit
			Min1	Typ	Max1
	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	VS = 4.75 V to 5.25 V	4.6	5	5.4	mV/°/s
	Nonlinearity	Best fit straight line		0.1		% of FS
	NULL
	Initial Null		2.3	2.50	2.7	V
	Over Temperature3	VS = 4.75 V to 5.25 V	2.3		2.7	V
	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		°/s/√Hz
	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
	VOUT at 298°K			2.50		V
	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	IOUT = ±100 µA	0.25		VS – 0.25	V
	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 < IOUT < 200 µA		5.0		mV/mA
	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

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 TMIN or TMAX.

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