AD7871TQ

Overview

The AD7871TQ 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 an input voltage range of ±3 V. It supports a throughput rate of 83 kSPS and features a self-contained internal clock or external clock synchronization. The T version provides an extended operating temperature range of −55°C to +125°C.

Feature Summary

• Complete 14-bit resolution with no missing codes guaranteed across the full temperature range.
• Versatile digital interface supporting parallel, byte, and serial data output formats for microprocessor compatibility.
• Integrated laser-trimmed internal clock eliminates the need for external timing components.
• Low power consumption typically rated at 50 mW during operation.

Applications

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

Procurement Notes

Verify that the ordering suffix 'T' corresponds to the extended temperature grade (-55°C to +125°C). Confirm package availability matches the specific pin configuration required for the target PCB layout. Ensure supply chain sources provide original manufacturer documentation to validate component authenticity.

Selection Notes

Select the AD7871TQ when bipolar input signals within ±3 V are required alongside high dynamic performance specifications. Consider this part for designs needing integrated reference and clock capabilities to minimize external component count. Evaluate the available data output formats against the host processor's bus architecture requirements.

Part Context

The AD7871/AD7872 series represents fast, complete 14-bit sampling ADCs designed for DSP users requiring precise dynamic specifications. The AD7871 variant offers multiple interface options, while the AD7872 is strictly serial. Both utilize Analog Devices' proprietary LC2MOS mixed-signal process for optimized performance and integration.

Replacement Considerations

Public confirmed substitute part numbers: AD7871ARZ, AD7871BRZ, AD7871JNZ, AD7871KNZ.