基于ADXRS624设计的陀螺仪传感技术

本文介绍了ADXRS624主要特性, 方框图, 评估板EVAL-ADXRS624电路图, 元件布局图和元件列表.
ADXRS624是ADI公司的完整的陀螺仪传感器,具有Z轴响应,很宽频率范围有很高的防振性能,能经受2000g的震动,单电源5V和105度C工作,主要用于导航系统,惯性测量,平台稳定性和机器人.

The ADXRS624 is a complete angular rate sensor (gyroscope) that uses the Analog Devices, Inc., surface-micromachining process to create a functionally complete and low cost angular rate sensor integrated with all required electronics on one chip. The manufacturing technique for this device is the same high volume BiMOS process used for high reliability automotive airbag accelerometers. The output signal, RATEOUT (1B, 2A), is a voltage proportional to angular rate about the axis normal to the top surface of the package. The output is ratiometric with respect to a provided reference supply. A single external resistor between SUMJ and RATEOUT can be used to lower the scale factor. An external capacitor sets the bandwidth. Other external capacitors are required for operation. A temperature output is provided for compensation techniques. Two digital self-test inputs electromechanically excite the sensor to test proper operation of both the sensor and the signal conditioning circuits. The ADXRS624 is available in a 7mm × 7mm × 3mm BGA chip scale package.

ADXRS624主要特性:

Complete rate gyroscope on a single chip

Z-axis (yaw rate) response

High vibration rejection over wide frequency

2000g powered shock survivability

Ratiometric to referenced supply

5 V single-supply operation

105℃ operation

Self-test on digital command

Ultrasmall and light (<0.15 cc, <0.5 gram)

Temperature sensor output

RoHS compliant

Qualified for automotive applications

ADXRS624应用:

Navigation systems

Inertial measurement units

Platform stabilization

Robotics

图1.ADXRS624方框图

The EVAL-ADXRS624 is a simple evaluation board that allows quick evaluation of the performance of the ADXRS624 ±50°/sec yaw rate gyro. No additional external components are required for operation. The EVAL-ADXRS624 has a 20-lead, dual in-line (0.3 inch width × 0.1 inch pin spacing) interface that allows easy prototyping of products without BGA soldering.


图2.评估板EVAL-ADXRS624电路图

The schematic of the EVAL-ADXRS624 is shown in Figure 2. The numbers that appear in squares correspond to the pins on the evaluation board. It is identical to the suggested application shown in the ADXRS624 data sheet. The analog and power grounds (AGND and PGND) have separate power planes in this evaluation board to accommodate application-specific grounding schemes. If the user requires only a single ground plane, these nodes can be shorted together. Both AGND and PGND must be grounded for the evaluation board to operate properly. Note that the analog supply voltage and charge pump supply voltage (AVCC and VDD) are not connected on the EVAL-ADXRS624 and that the user can connect these as appropriate to their application.

The parts layout of the EVAL-ADXRS624 is shown in Figure 3, and the parts list for the EVAL-ADXRS624 is shown in Table 1. As delivered, the EVAL-ADXRS624 is set to 10 Hz bandwidth (COUT = 100 nF). The user can add an external capacitor to further reduce the bandwidth and improve the noise floor.


图3.评估板EVAL-ADXRS624元件布局图

评估板EVAL-ADXRS624元件列表: