AD7870KNZ

Overview

The AD7870KNZ is a complete monolithic 12-bit analog-to-digital converter featuring an internal laser-trimmed clock, track-and-hold amplifier, and buried Zener reference. It operates from ±5 V supplies with a typical power dissipation of 60 mW. The device supports parallel, byte, and serial digital interfaces with a data access time of 57 ns. It accepts a bipolar input voltage range of ±3 V and delivers a signal-to-noise ratio of 72 dB at a 10 kHz input frequency. The component is housed in a 24-pin plastic DIP package and functions within an industrial temperature range of -25°C to +85°C.

Feature Summary

• Integrated on-chip 3 V buried Zener reference eliminates the need for external voltage references.
• Laser-trimmed internal clock oscillator ensures accurate conversion timing without external components.
• Versatile interface logic supports parallel, byte, and serial data output formats for flexible microprocessor integration.

Applications

• Data acquisition systems requiring high-speed sampling
• Digital signal processing applications needing dynamic performance specifications
• Industrial control systems operating in extended temperature environments

Procurement Notes

Verify the specific suffix KNZ corresponds to the industrial temperature grade (-25°C to +85°C) and PDIP-24 packaging when sourcing. Confirm that the ordering information matches the manufacturer's current revision C datasheet specifications. Ensure compatibility with ±5 V supply requirements and check for any obsolete status or lifecycle notices associated with this part number before finalizing procurement plans.

Selection Notes

Select the AD7870KNZ for applications requiring a ±3 V input range and 12-bit resolution. Compare its 72 dB SNR against other variants like the AD7875 if unipolar inputs are needed. Consider the 57 ns access time for system timing constraints. Verify that the 24-pin DIP package fits the board layout requirements compared to PLCC or SOIC options available in the series.

Part Context

The AD7870KNZ belongs to the AD7870/AD7875/AD7876 family of LC2MOS sampling ADCs. While sharing core architecture, the AD7870 is distinguished by its ±3 V input range and industrial temperature rating. Other family members include the AD7875 (unipolar 0 V to +5 V) and AD7876 (±10 V range). All variants offer similar speed and interface capabilities but differ in input scaling and package availability.

Replacement Considerations

Public confirmed substitute part numbers: AD7870JNZ, AD7870LP.