AD7870AJNZ

Overview

The AD7870AJNZ is a complete monolithic 12-bit analog-to-digital converter featuring a 2 μs track-and-hold amplifier and an 8 μs successive approximation ADC. It operates from ±5 V power supplies with a typical power dissipation of 60 mW. The device includes an internal 3 V reference and supports parallel, byte, and serial digital interfaces. Key performance metrics include a signal-to-noise ratio of 70 dB at a 10 kHz input frequency and a data access time of 57 ns. The industrial temperature range for the A suffix spans from -40°C to +85°C.

Feature Summary

• Integrated laser-trimmed clock oscillator eliminates external timing components
• Versatile interface logic supporting parallel, byte, and serial data formats
• On-chip buried Zener reference provides stable conversion baseline

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet revision to confirm the exact temperature grade and package variant. Ensure that the supply voltage requirements match the system design before integration.

Selection Notes

Select this component when a single-channel 12-bit resolution is required with integrated tracking and holding capabilities. Consider the ±3 V input range compatibility and the availability of multiple interface modes for microprocessor integration.

Part Context

This part belongs to the AD7870/AD7875/AD7876 family of LC2MOS sampling ADCs. The AD7870 variant specifically handles bipolar ±3 V inputs, distinguishing it from the unipolar AD7875 and wide-range AD7876 models within the same series.

Replacement Considerations

Direct replacements within the same family include the AD7870KNZ or AD7870JPZ, provided the temperature range and package type align with the application requirements.