AD7870JPZ-REEL

Overview

The AD7870JPZ-REEL is a monolithic 12-bit analog-to-digital converter (ADC) from Analog Devices, utilizing successive approximation architecture. It integrates a track-and-hold amplifier with a 2 μs acquisition time and an internal laser-trimmed clock for 6.5 to 9 μs conversion times. The device operates on ±5 V supplies and accepts a single-ended analog input range of ±3 V. It features a versatile digital interface supporting parallel, byte, and serial data formats with a typical 57 ns data access time. Key performance metrics include a signal-to-noise ratio of 70 dB at 10 kHz input frequency and a maximum sampling rate of 100 kS/s.

Feature Summary

• Integrates a complete 12-bit ADC with a high-speed track-and-hold amplifier and an internal 3 V buried Zener reference.
• Offers flexible data output options including 12-bit parallel, two 8-bit bytes, or serial transmission modes.
• Features a self-contained laser-trimmed internal clock that eliminates the need for external timing components.

Applications

• Data acquisition systems requiring fast throughput rates up to 100 kS/s.
• Digital signal processing applications needing low distortion and high dynamic performance.
• Industrial control systems interfacing with modern microprocessors via standard parallel or serial buses.

Procurement Notes

Verify the specific suffix REEL indicates tape-and-reel packaging when sourcing this component. Confirm the J temperature grade corresponds to the commercial operating range of 0°C to +70°C. Ensure the ordering part number matches the exact pin configuration and voltage specifications required for the target application design.

Selection Notes

Select the AD7870 variant specifically for bipolar input ranges of ±3 V. Consider the AD7875 for unipolar 0 V to +5 V inputs or the AD7876 for ±10 V ranges if different signal levels are required. Verify that the package type PLCC meets the board layout constraints and that the power supply requirements align with the system's ±5 V capability.

Part Context

This component belongs to the AD7870/AD7875/AD7876 family of LC2MOS 12-bit sampling ADCs. These devices share common architectural features such as the SAR core and internal reference but differ in analog input voltage ranges and available package styles. The JPZ designation identifies the specific plastic leaded chip carrier package variant within this product line.

Replacement Considerations

Direct functional replacements within the same family include the AD7875 and AD7876, provided the input voltage range requirements match the application needs. Other variants may require verification of pin compatibility and interface logic differences.