AD7871JNZ

Overview

The AD7871JNZ is a complete monolithic 14-bit analog-to-digital converter (ADC) fabricated in LC2MOS technology. It operates from ±5 V power supplies and accepts bipolar input signals within the ±3 V range. The device integrates a track-and-hold amplifier, successive approximation ADC, and a 3 V buried Zener reference. It supports parallel, byte, and serial digital interfaces with an internal laser-trimmed clock. Key performance metrics include an 80 dB signal-to-noise ratio at a 10 kHz input frequency, a maximum throughput rate of 83 kSPS, and typical power dissipation of 50 mW.

Feature Summary

• Integrates a self-contained, laser-trimmed internal clock to eliminate external timing components.
• Offers versatile interface logic supporting single 14-bit parallel words, two 8-bit bytes, or serial data streams.
• Features a high-speed track-and-hold amplifier capable of acquiring full-scale signals within 2 μs.
• Includes a factory-trimmed 3 V buried Zener reference for stable DC accuracy.

Applications

• Digital signal processing
• High speed modems
• Speech recognition and synthesis
• Spectrum analysis
• DSP servo control

Procurement Notes

Verify the specific suffix J against the manufacturer's ordering guide to confirm the commercial temperature range of 0°C to +70°C. Ensure the package type matches the required PCB footprint, as this model is available in multiple configurations including PDIP-28. Cross-reference the revision history to confirm the datasheet version aligns with the component batch specifications.

Selection Notes

Select the AD7871JNZ when a 14-bit resolution and low power consumption are required for mixed-signal applications. Consider the internal clock feature if external clock generation is undesirable. Evaluate the interface requirements carefully, as the J variant supports parallel, byte, and serial modes via the 14/8/CLK pin configuration. Verify that the ±3 V input range suits the application signal levels.

Part Context

The AD7871 belongs to the AD7871/AD7872 family of complete sampling ADCs. While the AD7871 provides flexible output formats, its counterpart, the AD7872, is restricted to serial output only. Both devices share the same core architecture, utilizing LC2MOS technology and identical power supply requirements. This family is designed for microprocessor and DSP interfacing.

Replacement Considerations

Public confirmed substitute part numbers: AD7871KNZ, AD7871JPZ.