Micro-Magic provides a detailed overview of its AD-K 32-bit high-precision A/D conversion circuit, developed for accelerometers used in inertial navigation, aerospace, and precision industrial measurement applications, outlining the board’s architecture and performance characteristics.
This A/D board is engineered for precise and synchronized acquisition of physical signals, meeting the core requirements of high-end navigation and measurement systems. Its flexible architecture supports the development of reliable signal acquisition systems for inertial navigation.
The board supports a ±50 mA current input range and uses 32-bit A/D conversion to capture minute current variations from accelerometers. Across its operating temperature range of -40°C to +70°C, it maintains a zero temperature coefficient better than ±2 nA/°C and a scale factor temperature coefficient below 3.0 ppm/°C. This allows the system to maintain minimal measurement drift even under varying temperature conditions, ensuring long-term accuracy for navigation solutions
Micro-Magic’s board has ultra-high stability, with zero stability and scale factor stability reaching the nA and ppm levels, which provides repeatable, reliable data while lowering overall system noise.
To meet the strict synchronization needs of multi-axis data, the board provides internal and external synchronization modes. In internal mode, it can autonomously generate a sampling clock or, for external mode, receive RS422 differential synchronization signals from a navigation computer.
A/D values for all channels are latched at the falling edge of the synchronization signal, ensuring acceleration and temperature data for the X, Y, and Z axes are captured simultaneously. This delivers a spatiotemporal consistent data source for subsequent navigation algorithms.
System integration features include a complete data packet format containing three-axis current, temperature information, card serial number, timestamp, and checksum. A concise instruction set allows a Host Computer to remotely control data transmission, set upload frequency from 1 to 200 Hz, and switch synchronization modes.
The design also incorporates independent power and ground pins and recommends twisted and shielded signal lines to support noise suppression and signal integrity. This ensures the integrity of the collected data at the physical level.
With its high precision, temperature stability, and synchronized acquisition capabilities, the 32-bit A/D conversion board addresses key signal acquisition requirements in high-precision Inertial Navigation Systems (INS). It supports improved accuracy, reliability, and environmental adaptability for high-end industrial and aerospace applications.
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