AD7872KNZ

Overview

The AD7872KNZ is a complete monolithic 14-bit analog-to-digital converter utilizing LC2MOS technology. It operates from ±5 V power supplies and accepts bipolar input signals within a ±3 V range. The device features an internal laser-trimmed clock, track-and-hold amplifier, and SAR architecture. Key electrical parameters 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. Data access time is specified at 57 ns.

Feature Summary

• Serial-only digital interface for microprocessor compatibility
• Integrated 3 V buried Zener voltage reference
• Self-contained laser-trimmed internal clock oscillator

Applications

• Digital signal processing systems
• High-speed modem applications
• Speech recognition and synthesis circuits
• DSP servo control loops

Procurement Notes

Verify the K suffix indicates commercial temperature operation (0°C to +70°C) against specific project requirements. Confirm package availability matches the required footprint. Ensure supply chain sources provide original manufacturer documentation to validate authenticity before integration into production designs.

Selection Notes

Select this component when a serial output format is preferred over parallel interfaces to reduce pin count. The internal clock eliminates external timing components, simplifying board layout. Verify that the ±5 V supply rails are available in the target system architecture to ensure proper operation of the analog front end.

Part Context

This part belongs to the AD7871/AD7872 family of fast, complete 14-bit sampling ADCs. While the AD7871 offers parallel and byte data formats, the AD7872 is restricted to serial output only. Both share identical analog performance specifications and internal architectures, differing primarily in their digital interface configurations.

Replacement Considerations

The AD7872KRZ serves as a direct replacement with identical functionality but utilizes a different package configuration. Verify pinout compatibility and thermal characteristics when substituting between these variants.