AD779JN

Overview

The AD779JN is a 14-bit monolithic analog-to-digital converter (ADC) from Analog Devices, operating within a temperature range of 0°C to +70°C. It features a sampling rate of 128 kSPS and utilizes a parallel bus interface for data access. The device incorporates an internal voltage reference and clock generation circuitry, requiring minimal external components. It operates on +5 V digital and ±12 V analog power supplies with a typical power consumption of 560 mW. The input supports unipolar (0 V to +10 V) or bipolar (±5 V) ranges with a high input impedance of 10 MΩ. The component is housed in a 28-pin plastic DIP package.

Feature Summary

• Complete integration of sample-hold amplifier, ADC, reference, and clock on a single chip
• High-speed conversion capability with 1 MHz full power bandwidth
• Factory-trimmed accuracy eliminating the need for external calibration
• Monolithic BiMOS technology ensuring long-term reliability

Applications

• Digital signal processing systems
• High-speed modems
• Speech recognition and synthesis equipment
• Spectrum analysis instruments
• DSP servo control applications

Procurement Notes

Verify the specific suffix 'JN' corresponds to the 0°C to +70°C temperature grade and Plastic DIP package configuration. Confirm that AC parameters are sufficient for the intended application, as DC specifications are listed as typical values for this grade. Ensure supply voltages match the required +5 V digital and ±12 V analog rails.

Selection Notes

Select the AD779JN when a complete 14-bit sampling ADC solution is required without discrete component complexity. This model is suitable for applications prioritizing AC performance metrics such as S/N+D ratio over strict DC linearity specifications. Consider the 16-bit bus interface compatibility if interfacing directly with 16-bit microprocessors.

Part Context

The AD779JN belongs to the AD779 family of complete sampling ADCs. It shares the same core architecture and pinout with other grades like the AD779KN, which offers specified DC parameters. The J-grade variant focuses on AC characterization, making it distinct from the K-grade while maintaining identical physical dimensions and interface logic.

Replacement Considerations

The AD779KN serves as a direct functional substitute offering specified DC accuracy. For 8-bit bus interfaces, the AD679 provides compatible functionality. Military versions compliant with MIL-STD-883 are available in ceramic packages.