AD7876CR

Overview

The AD7876CR is a complete monolithic 12-bit analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It features a 2 μs track-and-hold amplifier and an 8 μs successive approximation ADC with an internal laser-trimmed clock. The device operates from ±5 V power supplies and accepts a bipolar analog input voltage range of ±10 V. It provides a signal-to-noise ratio of 72 dB at a 10 kHz input frequency and offers a data access time of 57 ns. The component supports parallel, byte, and serial digital interfaces and includes an on-chip 3 V reference. It 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 an internal laser-trimmed clock oscillator.
• Supports versatile data output formats including single 12-bit parallel words, two 8-bit bytes, or serial data streams.
• Features a fast microprocessor interface with 57 ns data access time for compatibility with modern digital systems.
• Includes an on-chip temperature-compensated buried Zener reference capable of driving external loads.

Applications

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

Procurement Notes

Verify the specific suffix CR against the manufacturer's current ordering guide to confirm availability and compliance status. Check for any product discontinuance notifications or process change notices that may affect long-term supply. Ensure the selected variant matches the required industrial temperature range and package specifications for the target application.

Selection Notes

Select the AD7876CR when a bipolar ±10 V input range is required, distinguishing it from the AD7870 (±3 V) and AD7875 (0 V to +5 V). Confirm that the 24-pin SOIC package aligns with the PCB layout constraints. Verify that the internal 3 V reference can be scaled externally if a different reference voltage is needed for the system architecture.

Part Context

The AD7876CR belongs to the AD7870/AD7875/AD7876 family of 12-bit, 100 kHz sampling ADCs. While sharing identical core conversion architectures and interface logic, this specific model is differentiated by its ±10 V analog input capability. It complements the AD7870 and AD7875 within the same product line, offering flexibility for various signal conditioning requirements.

Replacement Considerations

Direct replacements include other variants within the AD7876 series such as AD7876CNZ or AD7876BRZ, provided the package type and temperature grade match the design requirements. Cross-family replacements are not recommended due to differences in pinouts and input ranges.