AD7871KNZ

Overview

The AD7871KNZ is a complete monolithic 14-bit successive approximation 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, a 3 V buried Zener reference, and versatile interface logic supporting parallel, byte, and serial data formats. Key electrical specifications 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. The component is housed in a 28-pin PDIP package and supports commercial temperature operation.

Feature Summary

• Integrates a laser-trimmed internal clock oscillator to eliminate external timing components.
• Supports multiple digital interface modes including 14-bit parallel, two-byte, and serial output formats.
• Features a self-contained track-and-hold amplifier with high-speed acquisition capabilities.

Applications

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

Procurement Notes

Verify that the ordering suffix KNZ corresponds to the specific temperature grade and package configuration required for the target application. Confirm compatibility with existing PCB footprints and ensure that supply voltage rails match the specified ±5 V requirements before finalizing procurement orders.

Selection Notes

Select this component when a complete 14-bit resolution is required alongside flexible data bus interfacing options. Consider the internal clock feature if minimizing external component count is a priority. Ensure the system design accommodates the ±5 V dual supply requirement and the specific bipolar input voltage range constraints defined in the datasheet.

Part Context

This part belongs to the AD7871/AD7872 family of LC2MOS sampling ADCs manufactured by Analog Devices. While the AD7872 variant offers only serial output, the AD7871 provides additional parallel and byte-mode flexibility. Both devices share identical core conversion architecture and dynamic performance characteristics.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.