AD22302

AD22302 Datasheet

AD22300, AD22301, AD22302

Part	Datasheet
AD22302	AD22302 (pdf)

Related Parts	Information
AD22301	AD22301

PDF Datasheet Preview
3.3V Single and Dual Axis Automotive Accelerometers AD22300, AD22301, AD22302 • Complete Acceleration Measurement System on a Single Monolithic IC • ±35g, ±70g and ±70g/±35g Ranges Available • Smallest Available Package Footprint For Automotive Safety Applications • 8 pin Leadless Chip Carrier • Full Differential Sensor & Circuitry for High Resistance to EMI/RFI • Environmentally robust packaging • Complete Mechanical and Electrical Self-test on Digital Command • Output Ratiometric to Supply • Sensitive Axes in the Plane of the Chip • High Linearity of Full-scale • Frequency Response Down To DC • Supply Voltage 3.3V • Low-Power Consumption mA single and dual axis • Tight Sensitivity Tolerance and Zero g Offset capability • Higher Output Drive Current • Largest available pre-filter clipping headroom • 400 Hz, 2 pole Bessel Filter The AD22300, AD22301, and AD22302 are derivative products of the fourth generation ADXL78 family surface micromachined accelerometers from Analog Devices with enhanced performance and lower cost. Designed for use in airbag applications, these products also provide complete cost-effective solutions useful for a wide variety of other applications. The AD22300 and AD22301 are single-axis accelerometers with g-ranges of ±37g or ±70g. The AD22302 is a monolithic two-axis XY version with the sensor axes orthogonal 90° to each other and in the plane of the chip. The AD22302 X-axis has a g-range of ±70g and its Y-axis has a g-range of ±37g. It can be used for sensing crashes in the front or side of the vehicle and to determine the angle of impact. The AD22300, AD22301, and AD22302 are temperature stable and accurate over the automotive temperature range, with a self-test feature that fully exercises all the mechanical and electrical elements of the sensor with a digital signal applied to a single pin. Vs Vdd AD22300/1 AD22302 Vdd2 Timing Generator Differential Demod Sensor 400Hz Bessel Filter Vs XOUT Exc Vdd Vdd2 Vdd3 Differential Sensor Timing Generator Demod Amp Differential Demod Sensor Self Test Self Test 400Hz Bessel Filter X OUT 400Hz Bessel Filter Y OUT All minimum and maximum specifications are guaranteed typical values are not guaranteed nor tested. Product characteristics and specifications are subject to change AD22300, AD22301 - AUTOMOTIVE GRADE SPECIFICATIONS TA = -40°C to +105°C, 3.3V DC ± 5%, Acceleration = 0g unless otherwise noted Sensor Output Full Scale Range Nonlinearity Package alignment error Cross-axis sensitivity Resonant frequency Sensitivity, Ratiometric Offset Zero-g output voltage Noise density Clock Noise Frequency Response -3dB frequency -3dB frequency drift Self Test Output change cubic vs. Vdd Logic input high Logic input low Turn on time Input resistance Output Amplifier Output voltage swing Capacitive load drive Pre-filter Headroom CFSR Power Supply Vdd Functional Voltage Range Supply current Temperature Range Conditions ±100µA IOUT ±250µA Vdd=3.3V, 100Hz, 25C Vdd=3.3V±5%, 100Hz, temp Vdd=3.3V, 25C error over temp 10Hz-400Hz, 3.3V 2 pole Bessel 25 deg C to TMIN or TMAX Vdd=3.3V ORDERING GUIDE Standard Devices G Range AD22300 AD22301 AD22302 ± 35g ± 70g ± 70g X, ± 35g Y Branding AD22300 AD22301 AD22302 PIN FUNCTION DESCRIPTIONS 8-Pin LCC Pin AD22300/01 Description No internal connection No internal connection Common connected to package lid Self-Test Self Test Input No internal connection Xout Voltage Output X Power Supply Vdd2 Power Supply Pin AD22302 Vdd3 Yout Self-Test Xout Vdd2 Description Power Supply Voltage Output Y Common connected to package lid Self Test Input No internal connection Voltage Output X Power Supply Power Supply Dimensions are nominal only. For tolerances, see the Package Outline Drawing for this part. All minimum and maximum specifications are guaranteed typical values are not guaranteed nor tested. Product characteristics and specifications are subject to change Theory of Operation The ADXL78 family provides a fully differential sensor structure and circuit path, resulting in the industry’s highest resistance to EMI/RFI effects. This latest generation uses electrical feedback with zero force feedback for improved accuracy and stability. The sensor resonant frequency is significantly higher than the signal bandwidth set by the on-chip filter, avoiding the signal analysis problems caused by resonant peaks near the signal bandwidth. Figure 1 is a simplified view of one of the differential sensor elements. Each sensor includes several differential capacitor unit cells. Each cell is composed of fixed plates attached to the substrate, and movable plates attached to the frame. Displacement of the frame changes the differential capacitance, which is measured by the on-chip circuitry. ACCELERATION ANCHOR PLATE CAPACITORS UNIT SENSING CELL MOVING PLATE FIXED PLATES MOVABLE FRAME UNIT FORCING CELL

PDF Datasheet Preview

3.3V Single and Dual Axis Automotive Accelerometers

AD22300, AD22301, AD22302
• Complete Acceleration Measurement System on a Single Monolithic IC
• ±35g, ±70g and ±70g/±35g Ranges Available
• Smallest Available Package Footprint For Automotive Safety Applications
• 8 pin Leadless Chip Carrier
• Full Differential Sensor & Circuitry for High Resistance to EMI/RFI
• Environmentally robust packaging
• Complete Mechanical and Electrical Self-test on Digital Command
• Output Ratiometric to Supply
• Sensitive Axes in the Plane of the Chip
• High Linearity of Full-scale
• Frequency Response Down To DC
• Supply Voltage 3.3V
• Low-Power Consumption mA single and dual axis
• Tight Sensitivity Tolerance and Zero g Offset capability
• Higher Output Drive Current
• Largest available pre-filter clipping headroom
• 400 Hz, 2 pole Bessel Filter

The AD22300, AD22301, and AD22302 are derivative products of the fourth generation ADXL78 family surface micromachined accelerometers from Analog Devices with enhanced performance and lower cost. Designed for use in airbag applications, these products also provide complete cost-effective solutions useful for a wide variety of other applications.

The AD22300 and AD22301 are single-axis accelerometers with g-ranges of ±37g or ±70g. The AD22302 is a monolithic two-axis XY version with the sensor axes orthogonal 90° to each other and in the plane of the chip. The AD22302 X-axis has a g-range of ±70g and its Y-axis has a g-range of ±37g. It can be used for sensing crashes in the front or side of the vehicle and to determine the angle of impact.

The AD22300, AD22301, and AD22302 are temperature stable and accurate over the automotive temperature range, with a self-test feature that fully exercises all the mechanical and electrical elements of the sensor with a digital signal applied to a single pin.

Vs Vdd

AD22300/1

AD22302

Vdd2

Timing Generator

Differential Demod

Sensor
400Hz Bessel Filter

Vs XOUT

Exc Vdd

Vdd2

Vdd3

Differential Sensor

Timing Generator

Demod Amp

Differential

Demod

Sensor

Self Test

Self Test
400Hz Bessel Filter

X OUT
400Hz Bessel Filter

Y OUT

All minimum and maximum specifications are guaranteed typical values are not guaranteed nor tested. Product characteristics and specifications are subject to change

AD22300, AD22301 - AUTOMOTIVE GRADE SPECIFICATIONS

TA = -40°C to +105°C, 3.3V DC ± 5%, Acceleration = 0g unless otherwise noted

Sensor Output Full Scale Range

Nonlinearity Package alignment error Cross-axis sensitivity Resonant frequency Sensitivity, Ratiometric

Offset Zero-g output voltage

Noise density Clock Noise Frequency Response -3dB frequency -3dB frequency drift Self Test Output change cubic vs. Vdd Logic input high Logic input low Turn on time Input resistance Output Amplifier Output voltage swing

Capacitive load drive Pre-filter Headroom CFSR Power Supply Vdd Functional Voltage Range Supply current Temperature Range

Conditions ±100µA IOUT ±250µA

Vdd=3.3V, 100Hz, 25C Vdd=3.3V±5%, 100Hz, temp

Vdd=3.3V, 25C error over temp 10Hz-400Hz, 3.3V 2 pole Bessel 25 deg C to TMIN or TMAX Vdd=3.3V
ORDERING GUIDE

Standard Devices

G Range

AD22300 AD22301 AD22302
± 35g ± 70g ± 70g X, ± 35g Y

Branding

AD22300 AD22301 AD22302

PIN FUNCTION DESCRIPTIONS
8-Pin LCC

Pin AD22300/01 Description

No internal connection

No internal connection

Common connected to package lid

Self-Test

Self Test Input

No internal connection

Xout

Voltage Output X

Power Supply

Vdd2

Power Supply

Pin AD22302

Vdd3

Yout

Self-Test

Xout

Vdd2

Description Power Supply Voltage Output Y Common connected to package lid Self Test Input No internal connection Voltage Output X Power Supply Power Supply

Dimensions are nominal only. For tolerances, see the Package Outline Drawing for this part.

All minimum and maximum specifications are guaranteed typical values are not guaranteed nor tested. Product characteristics and specifications are subject to change

Theory of Operation

The ADXL78 family provides a fully differential sensor structure and circuit path, resulting in the industry’s highest resistance to EMI/RFI effects. This latest generation uses electrical feedback with zero force feedback for improved accuracy and stability. The sensor resonant frequency is significantly higher than the signal bandwidth set by the on-chip filter, avoiding the signal analysis problems caused by resonant peaks near the signal bandwidth.

Figure 1 is a simplified view of one of the differential sensor elements. Each sensor includes several differential capacitor unit cells. Each cell is composed of fixed plates attached to the substrate, and movable plates attached to the frame. Displacement of the frame changes the differential capacitance, which is measured by the on-chip circuitry.

ACCELERATION

ANCHOR

PLATE CAPACITORS

UNIT SENSING CELL

MOVING PLATE

FIXED PLATES

MOVABLE FRAME

UNIT FORCING CELL

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived AD22302 Datasheet file may be downloaded here without warranties.

Datasheet ID: AD22302 517696