ADXL190

The ADXL190 is a complete acceleration measurement system on a single monolithic IC. It contains a polysilicon surfacemicromachined sensor and signal conditioning circuitry to implement an open-loop acceleration measurement architecture.

The ADXL190 is capable of measuring both positive and negative accelerations up to ±100 g, making it suitable for shock and vibration measurement.

Typical noise floor is 4 mg/ÖHz allowing signals below 40 milli-g to be resolved. The ADXL190 can measure both dynamic accelerations, (typical of vibration) or static accelerations, (such as inertial force or gravity).

The ADXL190 has a two-pole Bessel switched-capacitor filter. Bessel filters, sometimes called linear phase filters, have a step response with minimal overshoot and a maximally flat group delay. The 3 dB frequency of the poles is preset at the factory to 400 Hz. These filters are also completely self-contained and buffered, requiring no external components.

The ADXL190 features a built-in self-test feature that exercises both the mechanical structure and electrical circuitry. When triggered by a logic high on the self-test pin, an electrostatic force acts on the beam equivalent to approximately 20% of fullscale acceleration input, and thus a proportional voltage change appears on the output pin. No external components other than a decoupling capacitor are required.

The ADXL190 is available in a hermetic 14-lead surface mount cerpak, specified over the 40°C to +105°C temperature range.