AD7870KP-REEL

Overview

The AD7870KP-REEL is a monolithic 12-bit successive approximation analog-to-digital converter (ADC) from Analog Devices. It integrates a track-and-hold amplifier, an 8 μs ADC core, and a laser-trimmed internal clock. The device operates on ±5 V supplies with a typical power dissipation of 60 mW. It supports parallel, byte, and serial digital interfaces, featuring a data access time of 57 ns. The AD7870 handles bipolar input signals within a ±3 V range and delivers a signal-to-noise ratio of 70 dB at a 10 kHz input frequency.

Feature Summary

• Complete 12-bit SAR ADC with integrated 2 μs track-and-hold amplifier
• Internal laser-trimmed clock oscillator eliminates external timing components
• Versatile interface supporting 12-bit parallel, two-byte, or serial data formats
• On-chip 3 V buried Zener reference with output capability

Applications

• Digital signal processing systems requiring fast microprocessor interfacing
• Industrial control and automation applications
• Data acquisition systems utilizing 8-bit or 16-bit microprocessors

Procurement Notes

Verify the specific suffix 'REEL' indicates tape and reel packaging rather than tube packaging when sourcing. Confirm that the 'K' temperature grade corresponds to the commercial range of 0°C to +70°C as defined in the specifications table. Ensure compatibility with the PLCC-28 package format for PCB layout.

Selection Notes

Select the AD7870 variant specifically for bipolar input ranges of ±3 V. Compare dynamic performance metrics such as SNR and THD against system requirements, noting that these are fully specified for the AD7870. Consider the 57 ns data access time for compatibility with high-speed microprocessor buses.

Part Context

This component belongs to the AD7870/AD7875/AD7876 family of complete 12-bit sampling ADCs. While sharing the same core architecture and interface logic, the AD7870 is distinguished by its bipolar ±3 V input range, whereas the AD7875 supports unipolar 0 V to +5 V inputs and the AD7876 supports ±10 V inputs.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.