AD7876CNZ

Overview

The AD7876CNZ 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, a track-and-hold amplifier, and a laser-trimmed clock oscillator. The device supports a sampling rate of 100 kS/s with a conversion time of 8 μs maximum using an external clock or 9 μs maximum with the internal clock. It accepts single-ended analog input signals within a ±10 V range. Data output is available via parallel, byte, or serial interfaces, providing a data access time of 57 ns. The component is housed in a 24-pin PDIP package and is rated for operation between -55°C and +125°C.

Feature Summary

• Integrated 12-bit SAR architecture with on-chip track-and-hold amplifier and internal voltage reference.
• Versatile digital interface supporting parallel, byte, and serial data output formats for microprocessor compatibility.
• Laser-trimmed internal clock oscillator eliminates the need for external timing components.
• High-speed data access time ensures seamless interfacing with modern digital signal processors.

Applications

• Data acquisition systems requiring high accuracy and fast throughput.
• Industrial process control and monitoring applications.
• Medical instrumentation and diagnostic equipment.
• Automotive electronic testing and measurement systems.

Procurement Notes

Verify the specific suffix CNZ to confirm the plastic DIP-24 package and extended temperature rating. Confirm RoHS compliance status through official documentation as manufacturing processes may evolve. Check current lifecycle status, as older ADC models often face obsolescence. Ensure supply chain sources provide genuine parts with traceable origin to avoid counterfeit components.

Selection Notes

Select the AD7876CNZ when a ±10 V unipolar or bipolar input range is required alongside 12-bit resolution. Compare against AD7870 and AD7875 variants based on specific input voltage constraints. Consider the package type and operating temperature range requirements for the target environment. Evaluate interface needs to determine if parallel, byte, or serial modes are optimal for the system design.

Part Context

The AD7876CNZ belongs to the AD7870/AD7875/AD7876 family of 12-bit sampling ADCs. This series shares common architectural features such as the SAR core, internal reference, and versatile interface logic. The primary distinction among family members lies in the analog input voltage range and specific performance grades. The CNZ suffix denotes the commercial/industrial/extended temperature grade in a plastic dual-in-line package.

Replacement Considerations

Direct pin-compatible replacements within the same family include the AD7870 and AD7875, though their input ranges differ significantly. Verify that any substitute maintains the required ±10 V input capability and 12-bit resolution. Cross-reference datasheets for timing parameters and power consumption differences to ensure system compatibility.