AD7871KPZ

Overview

The AD7871KPZ is a complete monolithic 14-bit analog-to-digital converter (ADC) fabricated in LC2MOS technology. It integrates a track-and-hold amplifier, successive approximation ADC, and a 3 V buried Zener reference. The device operates from ±5 V power supplies with an input voltage range of ±3 V. It supports parallel, byte, and serial digital interfaces, offering flexible data output formats including a single 14-bit word or two 8-bit bytes. Key electrical specifications include an 80 dB signal-to-noise ratio at a 10 kHz input frequency, a throughput rate of 83 kSPS, and a typical power dissipation of 50 mW.

Feature Summary

• Integrates a laser-trimmed internal clock oscillator, eliminating the need for external timing components.
• Provides versatile interface logic supporting three distinct data output formats: 14-bit parallel, dual 8-bit byte, and serial streams.
• Features a self-contained track-and-hold amplifier capable of acquiring signals to 14-bit accuracy within 2 μs.

Applications

• Digital signal processing systems
• High-speed modem implementations
• Speech recognition and synthesis circuits
• Spectrum analysis equipment
• DSP servo control loops

Procurement Notes

Verify the specific suffix 'K' against the manufacturer's ordering guide to confirm the commercial temperature range (0°C to +70°C). Ensure that the PLCC package dimensions match the target PCB footprint requirements. Confirm RoHS compliance status if required by local regulations. Cross-reference the datasheet revision to ensure all dynamic performance parameters align with current design specifications.

Selection Notes

Select the AD7871KPZ when a 14-bit resolution and high throughput are required alongside low power consumption. Choose this component over the AD7872 if parallel or byte-mode interfacing is necessary for the microprocessor architecture. Consider the internal 3 V reference capability to simplify external biasing networks. Evaluate the ±3 V input range compatibility with the source signal levels before finalizing the selection.

Part Context

The AD7871 belongs to the AD7871/AD7872 family of fast, complete 14-bit sampling ADCs. While the AD7871 offers multiple interface options, its counterpart, the AD7872, is restricted to serial output only. Both devices share identical core conversion architectures and dynamic performance characteristics but differ in pin configurations and data access methods to suit different system integration needs.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing circuit designs before considering alternative manufacturers or families.