MXD2020E/F

Low Cost, low noise, low offset drift +/-1g Dual Axis Accelerometer with Digital Outputs

Features

Resolution better than 1 milli-g at 1 Hz
Dual axis accelerometer fabricated on a monolithic CMOS IC
On-chip mixed mode signal processing
50,000 g shock survival rating
17 Hz bandwidth
3.00V to 5.25V single supply operation
Small (5mm x 5mm x 2mm) surface mount package
Continuous self-test
Independent axis programmability (special order)
Ultra low initial Zero-g Offset and offset temperature drift

Application

• Automotive
  Vehicle Security/Active Suspension/ABS/Headlight Angle Control/Tilt Sensing
  
• Security
  Gas Line/Elevator/Fatigue Sensing
  
• Information Appliances
  Computer Peripherals/PDA's/Mouse/Smart Pens/Cell Phones
  
• Gaming
  Joystick/RF Interface/Menu Selection/Tilt Sensing
  
• Consumer
  LCD projectors, pedometers, blood pressure Monitor, digital

General Description

he MXD2020E/F is an ultra low noise and low cost, dual axis accelerometer built on a standard, submicron CMOS process. The MXD2020E/F measures acceleration with a full-scale range of +/- 1 g and a sensitivity of 20%/g @5V at 25°. It can measure both dynamic acceleration (e.g., vibration) and static acceleration (e.g., gravity). The MXD2020E/F design is based on heat convection and requires no solid proof mass. This eliminates stiction and particle problems associated with competitive devices and provides shock survival up to 50,000 g, leading to significantly lower failure rates and lower losses due to handling during assembly.

The MXD2020E/F provides two digital outputs. The outputs are digital signals with duty cycles (ratio of pulse width to period) that are proportional to acceleration. The duty cycles outputs can be directly interfaced to a micro-processor.

The typical noise floor is 0.2mg /allowing signals below 1 milli-g to be resolved at 1 Hz bandwidth. The MXD2020E/F is available in a LCC surface mount package (5mm x 5mm x 2mm height). It is hermetically sealed and operational over a -40° to +105° temperature range.

Due to the standard CMOS structure of the MXD2020E/F, additional circuitry can easily be incorporated into custom versions for high volume applications. Contact the factory for more information.