AD779KN

Overview

The AD779KN is a 14-bit monolithic analog-to-digital converter featuring a sample-hold amplifier, microprocessor-compatible bus interface, onboard reference, and clock generation circuitry. It operates from +5 V digital and ±12 V analog supplies with typical power consumption of 560 mW. The device achieves 128 kSPS conversion rates with a 1 MHz full power bandwidth. DC specifications include an integral nonlinearity of ±1 LSB and gain error of 0.09% FSR at +25°C. It supports unipolar (0 to +10 V) or bipolar (±5 V) input ranges via straight binary or two's complement coding.

Feature Summary

• Complete integration of high-speed sample-hold amplifier, ADC, voltage reference, and digital interface on a single chip.
• Factory trimming eliminates the need for external calibration modes or trimming to achieve rated performance.
• Microprocessor compatible 16-bit bus interface allows access to 14 data bits in a single read operation.
• High 10 MΩ input impedance enables direct connection to unbuffered sources without signal degradation.

Applications

• Signal processing applications requiring AC parameter characterization such as S/N+D ratio and THD.
• Control and measurement systems utilizing fully specified DC parameters like INL and gain accuracy.
• Multipurpose sampling A/D functions where discrete designs are insufficient.

Procurement Notes

Verify component authenticity through authorized Analog Devices distributors or certified suppliers. Request original manufacturer documentation to confirm grade and package options. Inspect for physical damage and ESD protection compliance upon receipt. Ensure storage conditions meet specified requirements to maintain device reliability.

Selection Notes

Select the AD779KN when both AC and DC parameters are required within the 0°C to +70°C temperature range. Choose this model over AC-only grades if precise linearity and gain accuracy are critical for the application. Consider the 28-pin plastic DIP package for through-hole mounting requirements.

Part Context

The AD779KN belongs to the AD779 family of complete 14-bit sampling ADCs fabricated on Analog Devices' BiMOS process. This technology combines low power CMOS logic with high precision bipolar circuits and laser-trimmed thin-film resistors. The K grade specifically denotes devices characterized and tested for both AC and DC specifications.

Replacement Considerations

The AD779JN serves as an AC-only alternative within the same package. For MIL-STD-883 compliant versions, refer to the Analog Devices Military Products Databook. No direct functional substitutes are listed in standard catalogs; verify compatibility with existing board layouts and supply voltages.