AD7872TQ

Overview

The AD7872TQ is a complete monolithic 14-bit analog-to-digital converter (ADC) fabricated in LC2MOS technology. It integrates a track-and-hold amplifier, successive approximation ADC, and a 3 V buried Zener reference. The device operates from ±5 V power supplies with a typical power dissipation of 50 mW. It features an internal laser-trimmed clock or external clock input, accepting bipolar analog signals within a ±3 V range. The AD7872 provides only serial data output formats, utilizing SCLK, SDATA, and SSTRB pins for communication. It achieves an 83 kSPS throughput rate with a maximum conversion time of 11 μs using the internal clock.

Feature Summary

• Integrates a high-speed track-and-hold amplifier capable of acquiring signals to 14-bit accuracy in under 2 μs.
• Includes a factory-trimmed, temperature-compensated 3 V buried Zener voltage reference.
• Supports both internal laser-trimmed oscillators and external TTL-compatible clock inputs.
• Provides a versatile serial interface compatible with modern microprocessors and DSPs.

Applications

• Digital signal processing systems
• High speed modems
• Speech recognition and synthesis equipment
• Spectrum analysis instruments
• DSP servo control loops

Procurement Notes

Verify the specific suffix T against the manufacturer's current ordering guide to confirm the extended temperature range (-55°C to +125°C). Confirm package availability as the SOIC-16 variant may have limited stock. Ensure supply chain sources provide valid RoHS compliance documentation matching the original Analog Devices specifications.

Selection Notes

Select the AD7872TQ when a dedicated serial interface is required without parallel bus overhead. This model is suitable for applications needing extended industrial temperature ranges compared to commercial variants. Consider the AD7871 if parallel or byte-mode data access is necessary instead of serial-only transmission.

Part Context

The AD7872 belongs to the AD7871/AD7872 family of 14-bit sampling ADCs. While the AD7871 offers parallel and byte interfaces, the AD7872 is restricted to serial output. Both share identical analog performance characteristics, including resolution, dynamic specifications, and internal reference architecture, differing primarily in digital connectivity options.

Replacement Considerations

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