AD7875LNZ

Overview

The AD7875LNZ is a complete, 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 and a laser-trimmed clock oscillator. The device accepts a unipolar analog input voltage range of 0 V to +5 V with a maximum sampling rate of 100 kS/s. Conversion time is typically 8 μs using the internal clock. Data output formats include parallel 12-bit word, two 8-bit bytes, or serial data via a versatile interface logic block. The component is housed in a 24-pin plastic dual-in-line package (PDIP-24) and supports commercial temperature operation.

Feature Summary

• Integrated track-and-hold amplifier enables accurate conversion of input signals up to 50 kHz.
• On-chip buried Zener reference provides a stable 3 V source without external components.
• Versatile digital interface supports parallel, byte, and serial data output modes for microprocessor compatibility.

Applications

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

Procurement Notes

Verify the specific suffix 'LNZ' against the manufacturer's current ordering guide to confirm pinout, package material, and environmental compliance status. Ensure the supplier documentation matches the Rev C datasheet specifications for the AD7875 series. Confirm that the component meets the required operating temperature range for the intended application environment before finalizing procurement.

Selection Notes

Select the AD7875LNZ when a single-channel, unipolar 0 V to +5 V input range is required. This model is appropriate for designs needing integrated reference and clock functions to minimize external component count. Compare dynamic performance parameters such as SNR and THD against system requirements. Verify that the PDIP-24 through-hole package aligns with the PCB layout constraints.

Part Context

The AD7875LNZ belongs to the AD7870/AD7875/AD7876 family of 12-bit ADCs. While sharing identical core architecture and interface logic, this specific variant is distinguished by its unipolar 0 V to +5 V input range. Other family members offer bipolar ranges, such as ±3 V for the AD7870 and ±10 V for the AD7876. All variants utilize the same 24-pin DIP footprint and internal 3 V reference structure.

Replacement Considerations

The AD7875KNZ serves as a direct functional substitute within the same family, offering identical electrical characteristics and pinout configuration. Both parts share the same 12-bit SAR architecture, 100 kS/s sampling rate, and unipolar input range. Verify package availability and temperature grade compatibility when substituting between these part numbers.