Industrial and Instrumentation ICs
Volume 8, Issue 10 YOUR SEMICONDUCTOR SOLUTIONS RESOURCE

IMU Sensor Simplifies Design and Reduces Cost of Complex Motion Sensing

Motion sensing across multiple axes is critical to meeting accuracy, stability, and response time requirements in both platform stabilization and navigation applications. The new ADIS16365 IMU combines three gyroscopes and three accelerometers to provide 6DoF motion sensing in a fully calibrated compact module. With the aid of embedded features such as precision autonull and a 0.05°/sec/g dynamic linear acceleration compensation factor, equipment designers can achieve in-run bias stability of 0.007°/sec or better without having to perform further motion testing. For industrial applications, the ADIS16365 achieves unprecedented performance levels, significantly reduces postprocessing complexity, and greatly lowers implementation cost for the system designer.

The device includes a programmable SPI (serial peripheral interface) port that provides easy access to device features, such as digital filtering, sample rate, power management, self-test, and sensor condition status and alarms. The ADIS16365 is backwards compatible with other iSensor® 6DoF sensors and includes a faster data access interface, additional system I/O, a higher dynamic range accelerometer (18 g), and an extended temperature range beyond –40°C to +105°C. To view the complete iSensor portfolio, go to www.analog.com/isensor.

ADIS16365

ADIS16365 Features

  • Bias stability: 007°/sec
  • Linear acceleration effect: 0.05°/sec/g
  • Sensitivity tempco: 40 ppm/°C
  • Voltage sensitivity: 0.25°/sec/V
  • Axis nonorthogonality: 0.05°
  • FS nonlinearity: 0.1%
  • Bandwidth: 350 Hz

Narrow-Band Communications: The Performance Challenge

Many of the worldwide regulations governing short range devices (SRDs) that operate below 1 GHz stipulate the use of narrow communication channels. This requirement typically limits the transmission bandwidth to between 12.5 kHz and 25 kHz, and thus limits the maximum data throughput in the channel. Achieving high data rates in these narrow channels is desirable for extended battery life, but this requirement typically poses a challenge to designers. Applications that currently use narrow-band channelizations include wireless security, automatic meter reading, and wireless sensors.

Solution

ADF7021-N: The Narrow-Band Solution

The ADF7021-N is a low power, highly integrated, 2FSK/3FSK/4FSK transceiver designed for operation in narrow-band, license-free ISM bands and licensed bands in the frequency ranges 80 MHz to 650 MHz and 842 MHz to 916 MHz. It has both Gaussian and raised cosine data filtering options to improve spectral efficiency for narrow-band applications, particularly applications that use 12.5 kHz channel spacings. It is suitable for circuit applications targeted at the European ETSI EN 300 220 standard, the Japanese ARIB-T67 standard, the Korean and the Chinese short range device regulations, and the North American FCC Part 15, Part 90, and Part 95 regulatory standards.

The ADF7021 provides excellent sensitivity, as low as –122 dBm at 1 kbps, that adds several dB to the system link margin and increases communication range. The ADF7021-N supports a wide variety of programmable features including Rx linearity, sensitivity, and IF bandwidth—allowing the user to trade off receiver sensitivity and selectivity against current consumption, depending on the application. A detailed block diagram of the ADF7021-N is shown above. For more information, visit www.analog.com/srd.

ADF7021-N

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