AD779KD

Overview

The AD779KD is a 14-bit monolithic analog-to-digital converter featuring a sample-hold amplifier, microprocessor-compatible bus interface, voltage 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 provides a 128 kSPS conversion rate, 1 MHz full power bandwidth, and 10 MΩ input impedance. It supports unipolar (0 to +10 V) or bipolar (±5 V) input ranges using straight binary or two's complement data formats respectively. Integral nonlinearity is specified at ±2 LSB for the K grade.

Feature Summary

• Complete integration of high-speed sample-hold amplifier, ADC, reference, and clock on a single chip
• Factory-trimmed accuracy eliminating the need for external calibration modes
• Microprocessor compatible 16-bit parallel bus interface with single-cycle read capability
• High input impedance allowing direct connection to unbuffered sources

Applications

• Signal processing applications requiring AC parameter characterization
• Measurement applications requiring DC parameter specification
• Multipurpose sampling systems utilizing 16-bit buses

Procurement Notes

Verify component authenticity through authorized Analog Devices distributors or certified secondary market suppliers. Request original manufacturer documentation and traceability records to confirm the part meets MIL-STD-883 compliance standards if required by the application specifications.

Selection Notes

Select the AD779KD when both AC and DC performance specifications are required within the commercial temperature range. This ceramic DIP package variant offers higher reliability than plastic versions for demanding environments. Ensure system design accommodates the specific ±12 V analog supply requirements distinct from standard single-supply logic families.

Part Context

The AD779 series utilizes a recursive subranging algorithm combining error correction and flash converter circuitry. Fabricated on Analog Devices' BiMOS process, it integrates low-power CMOS logic with precision bipolar circuits. The KD suffix specifically denotes the K-grade performance level housed in a 28-pin ceramic dual in-line package.

Replacement Considerations

The AD779JNZ is listed as a direct substitute option. Verify that the replacement package type and electrical characteristics align with the original design constraints before implementation.