AD7876BNZ

Overview

The AD7876BNZ 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 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 sampling rate of 100 kS/s, 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 PDIP package.

Feature Summary

• Integrated on-chip 3 V buried Zener reference and laser-trimmed clock oscillator eliminating external timing components.
• Versatile digital interface supporting 12-bit parallel, two-byte, and serial data output formats for microprocessor compatibility.
• Fast track-and-hold amplifier with 2 μs acquisition time ensuring accurate conversion of high-frequency signals.

Applications

• Data acquisition systems requiring 12-bit resolution and fast throughput.
• Industrial process control applications involving signal conditioning.
• Digital signal processing front-ends compatible with 8-bit and 16-bit microprocessors.

Procurement Notes

Verify the specific temperature grade suffix (e.g., B for industrial -40°C to +85°C) against project requirements. Confirm pinout compatibility with existing PCB footprints, as the DIP-24 package must match the design layout. Ensure power supply rails are strictly maintained at ±5 V ±5% to meet specified electrical characteristics. Check for RoHS compliance status if environmental regulations apply to the manufacturing facility.

Selection Notes

Select the AD7876BNZ when a ±10 V unbuffered analog input range is required. Compare against the AD7870 if a ±3 V input range suffices, or the AD7875 for unipolar 0 V to +5 V applications. Consider the SOIC package variant (AD7876BRZ) if surface mount technology is preferred over through-hole mounting. Evaluate the need for external reference scaling if system requirements exceed the internal 3 V limit.

Part Context

The AD7876BNZ belongs to the AD7870/AD7875/AD7876 family of 12-bit sampling ADCs. While sharing identical architecture and interface logic, this specific model is distinguished by its ±10 V analog input capability. It complements the AD7870 (±3 V range) and AD7875 (unipolar range) within the same product line, offering consistent dynamic performance and power consumption across the series.

Replacement Considerations

The AD7876CNZ serves as a verified alternative within the same package and specification profile. Verify that the replacement part meets the required operating temperature range and interface timing parameters before implementation.