AD2S44-TM18B

Overview

The AD2S44-TM18B is a low-cost, 14-bit dual-channel synchro/resolver-to-digital converter housed in a 32-lead bottom-brazed ceramic DIP hybrid package. It features independent Type II servo loop tracking converters for each channel, allowing continuous position and velocity output without external convert commands. The device utilizes a ratiometric conversion technique for noise immunity and supports signal frequencies from 400 Hz to 2600 Hz. Key specifications include ±4.0 arc minute accuracy over the -55°C to +125°C temperature range, a maximum tracking rate of 20 revolutions per second, and a built-in test facility for fault detection.

Feature Summary

• Dual-channel architecture with independent reference inputs and shared digital outputs
• 14-bit resolution with ±4.0 arc minute accuracy across the full military temperature range
• Built-in test (BIT) output indicating errors exceeding approximately one angular degree
• High tracking rate capability up to 20 revolutions per second

Applications

• Gimbal and gyro control systems
• Military servo control systems
• Fire control systems
• Avionic systems
• CNC machine tooling

Procurement Notes

Verify that the ordering suffix matches the required signal voltage (90 V or 11.8 V), reference voltage (115 V or 26 V), and format (synchro or resolver). Confirm the 'B' suffix indicates high-reliability processing if required by the application. Ensure the DH-32E package option is compatible with the target PCB footprint.

Selection Notes

Select this component when space, weight, and cost are critical constraints for dual-axis tracking applications. Choose the TM18B variant specifically for 11.8 V signal and 26 V reference inputs. Consider the acceleration constant of 62,000 sec⁻² when designing for high dynamic motion to ensure acceptable position error.

Part Context

The AD2S44 series consists of hybrid devices combining monolithic ICs manufactured via Analog Devices' BiMOS II process with passive components. This construction reduces internal component count while maintaining high reliability. The TM18B designation specifies the electrical configuration for 11.8 V signal and 26 V reference inputs within the standard military temperature range.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.