AD7872JN

Overview

The AD7872JN is a complete monolithic 14-bit analog-to-digital converter (ADC) fabricated in LC2MOS technology. It integrates a track-and-hold amplifier, successive approximation register, and a 3 V buried Zener reference. The device operates from ±5 V power supplies with a bipolar input range of ±3 V. It features an internal laser-trimmed clock or external clock input, achieving an 83 kSPS throughput rate. The AD7872 provides serial data output via SCLK, SDATA, and SSTRB pins. Key dynamic specifications include an 80 dB signal-to-noise ratio at a 10 kHz input frequency and a typical power dissipation of 50 mW.

Feature Summary

• Integrates a high-speed track-and-hold amplifier capable of acquiring signals to 14-bit accuracy within 2 μs.
• Features a self-contained, laser-trimmed internal clock that eliminates the need for external timing components.
• Includes a factory-trimmed 3 V temperature-compensated buried Zener reference with decoupling capabilities.
• Supports flexible microprocessor interfacing through a dedicated serial interface with open-drain outputs.

Applications

• Digital signal processing systems
• High-speed modem implementations
• Speech recognition and synthesis hardware
• Spectrum analysis equipment

Procurement Notes

Verify the specific suffix J against the manufacturer's ordering guide to confirm the commercial temperature range of 0°C to +70°C. Ensure the package type matches the required footprint, as the AD7872 is available in multiple configurations including SOIC and PDIP. Cross-reference the revision history to confirm the datasheet version aligns with the component lot date code.

Selection Notes

Select the AD7872 when a serial-only interface is preferred over parallel options. Compare the 83 kSPS throughput against system sampling requirements. Evaluate the 80 dB SNR specification relative to the input signal bandwidth. Consider the ±5 V supply requirement versus available system rails. Verify that the serial protocol compatibility matches the target digital processor.

Part Context

The AD7872 belongs to the AD7871/AD7872 family of 14-bit sampling ADCs. While the AD7871 offers parallel and byte output formats, the AD7872 is restricted to serial data transmission only. Both devices share identical core architecture, dynamic performance, and analog input characteristics. The primary distinction lies in the digital interface configuration and pin count.

Replacement Considerations

Public confirmed substitute part numbers: AD7872KRZ.