AD7870LP-REEL

Overview

The AD7870LP-REEL is a monolithic 12-bit analog-to-digital converter (ADC) from the AD7870 series, manufactured by Analog Devices. It integrates a track-and-hold amplifier, an 8 μs successive approximation ADC, and a laser-trimmed internal clock. The device operates on ±5 V supplies with a typical power dissipation of 60 mW. It features a versatile digital interface supporting parallel, byte, and serial data formats, enabling compatibility with microprocessors and DSPs. The AD7870 handles bipolar input signals within a ±3 V range.

Feature Summary

• Complete 12-bit SAR ADC with integrated 2 μs track-and-hold amplifier
• On-chip laser-trimmed internal clock eliminates external timing components
• Versatile interface logic supports parallel, byte, and serial data output modes
• Internal 3 V buried Zener reference with REF OUT pin for external scaling

Applications

• Industrial process control systems requiring high-speed sampling
• Data acquisition modules for scientific and medical instrumentation
• Digital signal processing front-ends for audio and vibration analysis
• Battery-powered portable test equipment due to low power consumption

Procurement Notes

Verify that the REEL suffix indicates tape-and-reel packaging rather than tube packaging when sourcing this specific part number. Confirm the temperature grade matches the application requirements, as the base AD7870 model spans commercial, industrial, and extended ranges depending on the intermediate letter code.

Selection Notes

Select the AD7870 variant specifically for bipolar ±3 V input applications. Ensure the system design accommodates the ±5 V dual supply requirement. For unipolar or wider voltage ranges, consider the AD7875 or AD7876 respectively. Verify that the required data interface mode (parallel vs. serial) aligns with the host controller's capabilities.

Part Context

This component belongs to the AD7870/AD7875/AD7876 family of complete 12-bit sampling ADCs. The AD7870 is distinguished by its bipolar ±3 V input capability, whereas the AD7875 offers a 0 V to +5 V unipolar range and the AD7876 supports ±10 V inputs. All members share identical architecture, speed, and interface characteristics.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Cross-model variants within the same family include AD7875 and AD7876, which differ primarily in analog input voltage ranges.