Low Noise, Low Power, Wide Bandwidth, 3-Axis MEMS Accelerometer

The ADXL318 is a low noise density, low power, 3-axis accelerometer with selectable measurement ranges. The ADXL318 supports the ±4g, ±8g, and ±16g ranges.

The ADXL318 offers industry leading noise, enabling precision applications with minimal calibration. The low noise and low power ADXL318 enables accurate measurements of audio signals even in high vibration environments.

The ADXL318 multifunction pin names may be referenced only by their relevant function for either the serial peripheral interface (SPI) or inter-IC (I2C) interface, or these pin names can be referenced by their audio function (pulse density modulation (PDM), inter-IC sound (I2S), or time division multiplexing (TDM)).

In addition to its low power consumption, the ADXL318 has many features to enable true system level performance. These features include a built-in micropower temperature sensor, interrupts, and first in, first out (FIFO). In addition, the ADXL318 has provisions for external control of the sampling time and/or an external clock.

The ADXL318 operates on a wide, 2.25V to 3.6V supply range (or 1.8V supply) and can interface, if necessary, to a host operating on a separate supply voltage. The ADXL318 is available in a 14-terminal, 2.9mm × 2.8mm × 0.87mm, LGA package, and it is specified to operate over the full Grade 1 automotive temperature range.

APPLICATIONS

* Automotive road noise cancellation (RNC)

* Condition-based monitoring

* Robotics

* Ultralow noise density: 20μg/√Hz (XY) and 27μg/√Hz (Z)

* Low power consumption: 340μA

* Wide bandwidth: 4kHz

* Relative flatness with digital correction (<3.8kHz): 0.5dB

* Relative flatness without digital correction (<2.5kHz) : 2dB

* Low latency

* Group delay <110μs for I2S/TDM

* Group delay <50μs for PDM

* Digital features

* 16-bit ADC

* Multiprotocol serial interfaces: SPI or I2C

* Multiprotocol audio data output: I2S, TDM, and PDM

* Programmable LPF and HPF

* Data synchronous or asynchronous sampling

* Output FIFO: 320 word