AD7875KNZ

Overview

The AD7875KNZ is a monolithic 12-bit successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates from ±5 V power supplies and features an internal 3 V buried Zener reference, a track-and-hold amplifier, and a laser-trimmed clock oscillator. The device accepts a unipolar analog input range of 0 V to +5 V with a maximum sampling rate of 100 kS/s. Key electrical specifications include a typical signal-to-noise ratio of 70 dB at a 10 kHz input frequency, a conversion time of 6.5 μs to 9 μs, and a data access time of 57 ns. It supports parallel, byte, and serial digital interfaces.

Feature Summary

• Integrates a complete 12-bit ADC with an on-chip 3 V reference and laser-trimmed clock, eliminating the need for external timing components.
• Offers versatile digital interface options including single 12-bit parallel word, two 8-bit bytes, or serial data formats.
• Features a fast microprocessor interface with 57 ns data access time compatible with modern 8-bit and 16-bit systems.
• Includes a high-speed track-and-hold amplifier that acquires signals to 12-bit accuracy in under 2 μs.

Applications

• Data acquisition systems requiring 12-bit resolution
• Industrial process control applications
• Digital signal processing front-ends

Procurement Notes

Verify the specific suffix KNZ indicates a plastic DIP-24 package compliant with RoHS standards. Confirm the temperature grade corresponds to the commercial range (0°C to +70°C). Ensure the ordering part number matches the required pin configuration and lead finish specifications provided in the manufacturer's official documentation.

Selection Notes

Select the AD7875KNZ when a unipolar 0 V to +5 V input range is required. Compare dynamic performance parameters such as SNR and THD against system requirements. Verify that the ±5 V supply rails are available and that the package style meets the PCB layout constraints.

Part Context

The AD7875KNZ belongs to the AD7870/AD7875/AD7876 family of 12-bit sampling ADCs. While sharing core architecture, the AD7875 is distinguished by its unipolar 0 V to +5 V input range, whereas the AD7870 uses ±3 V and the AD7876 uses ±10 V. All variants utilize the same 24-pin DIP package option and internal 3 V reference structure.

Replacement Considerations

Public confirmed substitute part numbers: AD7875ARZ, AD7875ARMZ, AD7875BQ.