AD7876CRZ

Overview

The AD7876CRZ 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 laser-trimmed clock, track-and-hold amplifier, and 3 V buried Zener reference. The device accepts single-ended analog input signals within a ±10 V range. It supports parallel, byte, and serial digital interfaces with a typical data access time of 57 ns. Key performance specifications include a signal-to-noise ratio of 72 dB at a 10 kHz input frequency, a maximum conversion time of 9 μs using the internal clock, and a typical power dissipation of 60 mW. The component is housed in a 24-pin SOIC package.

Feature Summary

• Integrates a 12-bit SAR ADC with a 2 μs track-and-hold amplifier and on-chip voltage reference.
• Offers versatile digital interface options including parallel, byte, and serial data output formats.
• Features a self-contained internal clock that is laser-trimmed for accurate conversion timing control.

Applications

• Data acquisition systems requiring high-speed sampling
• Digital signal processing applications
• Industrial process control instrumentation

Procurement Notes

Verify the specific suffix CRZ indicates the industrial temperature grade (-40°C to +85°C) and lead-free RoHS-compliant packaging. Confirm the pinout matches the 24-pin SOIC configuration. Ensure supply voltages are strictly maintained within ±5% tolerance to guarantee specified linearity and dynamic performance parameters.

Selection Notes

Select this model when a ±10 V unipolar or bipolar input range is required. Compare against AD7870 if a ±3 V range is sufficient, as it may offer different cost dynamics. Verify that the 57 ns access time meets the microprocessor bus speed requirements. Check if the internal 3 V reference is adequate or if external scaling circuits are needed for higher reference voltages.

Part Context

This component belongs to the AD7870/AD7875/AD7876 family of 12-bit sampling ADCs. While sharing the same core architecture and interface logic, the AD7876 is distinguished by its ±10 V analog input capability. Other family members like the AD7870 handle ±3 V inputs, and the AD7875 handles 0 V to +5 V inputs. All variants utilize the same 24-pin DIP or SOIC packages where applicable.

Replacement Considerations

Public documentation identifies the AD7876BRZ as a direct substitute offering the same electrical specifications and pinout but potentially with different manufacturing lot characteristics or updated compliance status. Verify package compatibility before substitution.