AD7840SQ/883B

Overview

The AD7840SQ/883B is a military-grade, complete 14-bit voltage output Digital-to-Analog Converter (DAC) fabricated in LC2MOS technology. It integrates a 14-bit DAC, a 3 V buried Zener reference, an output amplifier, and high-speed control logic. The device operates from ±5 V supplies with typical power dissipation of 70 mW. It supports both parallel and serial interfaces, featuring a minimum write pulse width of 45 ns and a maximum serial clock rate of 6 MHz. The analog output provides a bipolar range of ±3 V. This specific variant is processed to MIL-STD-883, Class B standards for extended temperature operation from –55°C to +125°C.

Feature Summary

• Complete 14-bit DAC with integrated 3 V reference and output buffer
• Dual interface capability: Parallel (21 ns setup) and Serial (6 MHz max clock)
• MIL-STD-883, Class B processing for ruggedized applications
• Extended temperature range: –55°C to +125°C

Applications

• High-speed digital signal processor (DSP) systems
• Precision instrumentation requiring extended temperature stability
• Servo control and waveform generation circuits
• Military aerospace data acquisition systems

Procurement Notes

Verify that the component is sourced from authorized distributors or qualified military suppliers to ensure authenticity. Confirm the presence of the /883B suffix indicates compliance with MIL-STD-883 Class B requirements. Request the manufacturer's military datasheet and certificate of conformance upon delivery to validate lot traceability and screening procedures.

Selection Notes

Select this model when MIL-STD-883 Class B reliability is mandatory and operation is required below 0°C. The SQ package denotes a ceramic DIP (Q-24), suitable for hermetic sealing needs. Ensure the system design accommodates the ±5 V supply rails and the 3 V reference input requirement. Verify that the –55°C to +125°C operating range aligns with the environmental constraints of the target application.

Part Context

The AD7840 series comprises fast, complete 14-bit DACs designed for DSP interfacing. The standard commercial versions include JN, KN, JP, KP, AQ, ARS, BQ, and SQ packages. The /883B designation specifically identifies units processed according to military standards, offering enhanced reliability and screening compared to standard industrial or commercial grades within the same functional family.

Replacement Considerations

Direct pin-compatible replacements within the AD7840 family include AD7840SQ for standard commercial use, though it lacks military screening. For non-military applications requiring similar performance, AD7840KN offers higher SNR but in plastic packaging. No other manufacturers provide identical pin-for-pin replacements with MIL-STD-883 certification.