AD2S44UM12B

Overview

The AD2S44UM12B is a 14-bit dual-channel synchro/resolver-to-digital converter (RDC) housed in a 32-lead bottom-brazed ceramic DIP hybrid package. It provides independent Type II servo loop tracking for two channels, utilizing ratiometric conversion for noise immunity. The device operates on ±15 V power supplies with quiescent currents of approximately 80 mA and 45 mA. It supports signal frequencies from 400 Hz to 2600 Hz and achieves an accuracy of ±4.0 arc minutes over the −55°C to +125°C temperature range. Digital outputs are presented via three-state latches, allowing continuous tracking without interruption during data reads.

Feature Summary

• Dual-channel architecture with independent reference inputs and shared digital outputs
• 14-bit resolution with ±4.0 arc minute accuracy over full military temperature range
• Built-in test (BIT) facility for fault detection and failsafe system integration
• High common-mode rejection (>74 dB) and tolerance for long lead lengths

Applications

• Gimbal and gyro control systems
• Military servo control and fire control systems
• Avionic systems and antenna monitoring
• Robotics and CNC machine tooling

Procurement Notes

Verify that the ordering suffix matches the required signal and reference voltage configuration. The 'UM12B' designation indicates specific electrical parameters including 90 V signal and 115 V reference inputs. Confirm the B suffix denotes high-reliability processing standards if required for the application environment.

Selection Notes

Select this component when space, weight, and cost are critical constraints requiring dual-channel conversion. Ensure the system can provide ±15 V power supplies and supports the required 400 Hz to 2600 Hz reference frequency range. Verify compatibility with the 32-lead hybrid DIP package dimensions for PCB layout.

Part Context

The AD2S44 series consists of low-cost, high-reliability hybrid converters designed for demanding environments. The UM12B variant specifically targets applications needing 90 V signal and 115 V reference inputs. It utilizes Analog Devices' proprietary BiMOS II process for the internal monolithic ICs, ensuring high reliability and low power consumption within the hybrid structure.

Replacement Considerations

The SDC/RDC1740 series offers similar hybrid RDC functionality but includes internal isolating micro-transformers. For monolithic alternatives with higher resolution, the AD2S80A series provides up to 16-bit resolution and ±2 arc minute accuracy.