AD669AR

Overview

The AD669AR is a monolithic 16-bit DACPORT digital-to-analog converter manufactured on Analog Devices’ BiMOS II process. It integrates current switches, decoding logic, an output amplifier, a buried Zener reference, and double-buffered latches. The device features a 16-bit parallel input interface with TTL/LSTTL/5 V CMOS compatibility. Key electrical parameters include a resolution of 16 bits, a settling time of 6 μs typ for a 10 V step, and a glitch impulse of 15 nV-s typ. It operates from analog supplies of ±13.5 V to ±16.5 V and a digital supply of +4.5 V to +5.5 V. The AR suffix denotes the SOIC-28 package variant specified for operation between –40°C and +85°C.

Feature Summary

• Complete 16-bit D/A function with on-chip output amplifier and high-stability buried Zener reference.
• Double-buffered latch structure eliminates data skew errors and allows simultaneous updating in multi-DAC systems.
• Pin-programmable unipolar (0 V to +10 V) or bipolar (–10 V to +10 V) output ranges without external components.
• Microprocessor compatible with 16-bit parallel input and fast 40 ns write pulse capability.

Applications

• Signal generation applications requiring low THD+N (0.009% max).
• Multi-DAC systems requiring simultaneous updates via shared LDAC control.
• Precision instrumentation utilizing the internal 10 V reference and buffered voltage output.

Procurement Notes

Verify the specific grade (AN/BN vs AQ/SQ) required for the target temperature range, as the AD669AR is rated for –40°C to +85°C. Confirm that the system power supplies match the specified ranges: VCC/VEE at ±13.5 V to ±16.5 V and VLL at +4.5 V to +5.5 V. Ensure ESD precautions are followed, as the device is classified as Class 2 per MIL-STD-883 Method 3015.2.

Selection Notes

Select the AD669AR when a 16-bit resolution with parallel interface and integrated reference is needed in an SOIC-28 package. Compare linearity specifications: the 'A' grade has ±4 LSB INL/DNL, while the 'B' grade offers ±2 LSB. Consider the AD669SQ if extended temperature operation up to +125°C is required. Evaluate the need for external gain/offset trimming if higher accuracy than the factory-trimmed internal reference allows.

Part Context

The AD669 belongs to the DACPORT family of complete monolithic D/A converters. The AD669AR is the industrial temperature grade version packaged in a 28-pin SOIC. Other variants include the plastic DIP (AD669AN/BN), hermetic cerdip (AD669AQ/SQ), and military-compliant versions (AD669/883B). The architecture utilizes segmented current sources and an R-2R ladder for high precision.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material. For pin-compatible alternatives within the same family, consider the AD669BR (SOIC, B-grade) or AD669BN (Plastic DIP, B-grade). Verify that any replacement matches the 16-bit resolution, parallel interface, and supply voltage requirements.