AD7875LPZ-REEL

Overview

The AD7875LPZ-REEL is a complete monolithic 12-bit analog-to-digital converter (ADC) from Analog Devices Inc. It integrates a track-and-hold amplifier, an 8 μs successive approximation ADC, and a 3 V buried Zener reference on a single chip. The device operates from ±5 V power supplies and accepts a unipolar analog input voltage range of 0 V to +5 V. It features a laser-trimmed internal clock that guarantees accurate conversion timing without external components. Data output formats include parallel 12-bit words, two 8-bit bytes, or serial data, providing versatile interfacing options for microprocessors.

Feature Summary

• Integrates a fast track-and-hold amplifier with an acquisition time of 2 μs max.
• Includes an on-chip temperature-compensated 3 V buried Zener reference.
• Supports multiple digital interface modes including parallel, byte, and serial access.
• Features a self-contained internal clock oscillator requiring no external timing components.

Applications

• Data acquisition systems requiring 12-bit resolution.
• Industrial process control applications.
• Instrumentation and measurement equipment.
• Digital signal processing front-ends.

Procurement Notes

Verify the specific suffix LPZ corresponds to the 28-pin PLCC package variant when sourcing. Confirm the REEL designation indicates tape and reel packaging for automated assembly. Ensure the component meets RoHS compliance requirements for the intended market. Cross-reference the manufacturer part number with official distributor catalogs to confirm current availability status.

Selection Notes

Select this model for applications requiring a unipolar 0 V to +5 V input range. Choose the AD7875 over the AD7870 or AD7876 if bipolar inputs are not required. Consider the 28-pin PLCC package for surface mount designs needing this specific footprint. Verify that the 100 kHz sampling rate and 57 ns data access time meet system throughput requirements.

Part Context

The AD7875 is part of the AD7870/AD7875/AD7876 family of 12-bit, 100 kHz sampling ADCs. While sharing core architecture, the AD7875 is distinguished by its unipolar 0 V to +5 V input range, unlike the bipolar ±3 V (AD7870) or ±10 V (AD7876) variants. All family members share identical pinouts and interface logic, facilitating design flexibility across different input voltage requirements.

Replacement Considerations

Public confirmed substitute part numbers: AD7875KNZ, AD7875LN.