High Performance Accelerometer with Dual Spectrum Signal Processing Data Sheet ADXL195/ADXL295 FEATURES GENERAL DESCRIPTION Single-axis (ADXL195) and dual-axis (ADXL295) configurations The ADXL195/ADXL295 are dual spectrum accelerometers 120 g baseband acceleration channel that measure baseband acceleration in up to two axes (XL-X 12-bit resolution at 62.5 mg/LSB and XL-Y), as well as high frequency (HF) acceleration energy. 512 kHz data interpolation rate Identical, independent X and Y sense structures are implemented 40 g high frequency signal processing channel AVG to achieve the best possible fail-safe performance. 10-bit resolution at 83.3 mg avg/LSB The XL-X and XL-Y channels output baseband acceleration 128 kHz data interpolation rate information with a nominal full-scale range of 120 g and a Sensor frequency response down to dc bandwidth of 408 Hz. The acceleration data is provided as a On-demand electromechanical self-test 12-bit, twos complement word with a resolution of 62.5 mg/LSB. On-demand HF signal injection self-test HF acceleration within the frequency band of 15.5 kHz to Fully differential circuitry for high resistance to EMI/RFI 23 kHz is rectified and filtered to generate an average g (gAVG) Independent x- and y-axis sense structures for robust energy measurement. The HF channel has a nominal full-scale FMEA performance range of 40 g and a bandwidth of 393 Hz. When combined Independent x- and y-axis arming thresholds AVG with the XL-X and XL-Y information, HF acceleration information Low noise allows for enhanced vehicle impact detection and discrimination. 1 LSB rms (12-bit baseband acceleration channel) 2 LSB rms (10-bit high frequency acceleration channel) The ADXL195/ADXL295 are available in a 16-lead, narrow-body Qualified for automotive applications SOIC package with an exposed pad. The ADXL195/ADXL295 Temperature range: 40C to +105C can operate at 3.3 V and 5 V and are specified for operation from 3.3 V and 5 V operation 40C to +105C. APPLICATIONS Enhanced crash sensing Shock detection FUNCTIONAL BLOCK DIAGRAM ARM X SELF- STATE MACHINE TEST ARM Y HF SELF- TEST GND INTERPOLATION EPAD 3 OFFSET/ AT 512kHz SINC + FIR FILTER OFFSET SENSITIVITY 3dB AT 408Hz CANCELLATION - CALIBRATION AC DEMOD MOD AMP MISO IIR, SINC, FIR BAND-PASS MOSI LOW-PASS FILTER SENSITIVITY INTERPOLATION X-AXIS SENSOR ABS 15.5kHz TO CALIBRATION FILTERS AT 128kHz SENSOR DRIVERS 23kHz 3dB AT 393Hz SCLK CS INTERPOLATION OFFSET/ AT 512kHz - 3 SINC + FIR FILTER OFFSET AC SENSITIVITY DEMOD MOD 3dB AT 408Hz CANCELLATION AMP CALIBRATION DEVICE ID VDD OTP TRIM Y-AXIS SENSOR MEMORY VREG SENSOR DRIVERS CONFIGURATION TIMING GENERATOR Figure 1. For more information about the ADXL195/ADXL295, please contact the Analog Devices, Inc., Customer Interaction Center at ADXL195/ADXL295 Data Sheet NOTES 20122013 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D10496F-0-1/13(SpA) Rev. SpA Page 2 of 2