AD7872JR

Overview

The AD7872JR is a complete monolithic 14-bit analog-to-digital converter (ADC) fabricated in LC2MOS technology. It operates from ±5 V power supplies and accepts bipolar input signals within the ±3 V range. The device features an internal track-and-hold amplifier, a successive approximation register ADC, and a laser-trimmed 3 V buried Zener reference. It provides a throughput rate of 83 kSPS with a typical power dissipation of 50 mW. The AD7872 supports only serial data output formats via SCLK, SDATA, and SSTRB pins. Dynamic performance includes a signal-to-noise ratio of 80 dB at a 10 kHz input frequency and a total harmonic distortion of -86 dB maximum.

Feature Summary

• Serial-only digital interface for microprocessor compatibility
• Integrated track-and-hold amplifier with 2 μs acquisition time
• Internal 3 V temperature-compensated buried Zener reference
• Self-contained laser-trimmed internal clock oscillator

Applications

• Digital signal processing systems
• High-speed modem applications
• Speech recognition and synthesis circuits
• Spectrum analysis equipment
• DSP servo control loops

Procurement Notes

Verify the specific suffix 'JR' against the manufacturer's current ordering guide to confirm package type and temperature range specifications. Ensure that the serial interface requirements align with the host system's timing constraints. Confirm RoHS compliance status if required by local regulations. Check for any recent product change notices affecting pinout or electrical characteristics.

Selection Notes

Select this component when a single-ended 14-bit resolution is required with minimal external circuitry. The AD7872 is suitable for designs where board space is limited due to its integrated reference and clock. Consider the serial interface overhead if high data rates are needed compared to parallel alternatives. Verify that the ±5 V supply rails are available in the target system architecture.

Part Context

The AD7872 belongs to the AD7871/AD7872 family of fast, complete 14-bit sampling ADCs. While the AD7871 offers parallel and byte interfaces, the AD7872 is restricted to serial output only. Both devices share identical analog performance characteristics and internal architectures. This family is designed for applications requiring high accuracy and low power consumption in compact packages.

Replacement Considerations

Direct substitutes include other Analog Devices 14-bit SAR ADCs with serial interfaces. Verify pin compatibility and software driver adjustments for different serial protocols. Ensure dynamic performance metrics such as SNR and THD meet the original design specifications.