AD7875TQ

Overview

The AD7875TQ is a complete monolithic 12-bit successive approximation analog-to-digital converter (ADC) from Analog Devices. It integrates a track-and-hold amplifier, an 8 μs ADC core, and a laser-trimmed internal clock. The device operates on ±5 V supplies and accepts a unipolar analog input range of 0 V to +5 V. It features versatile digital interfaces supporting parallel, byte, and serial data formats with a typical data access time of 57 ns. The T suffix denotes an extended temperature rating of −55°C to +125°C. Typical power dissipation is 60 mW, and the signal-to-noise ratio is 72 dB at a 10 kHz input frequency.

Feature Summary

• Integrated 3 V buried Zener reference with external scaling capability
• Versatile interface logic supporting parallel, byte, and serial output modes
• Laser-trimmed internal clock oscillator for accurate conversion timing
• Fast microprocessor compatibility with 57 ns data access time

Applications

• Digital signal processing systems requiring high dynamic performance
• Industrial control applications operating in extreme temperature environments
• Data acquisition systems interfacing with 8-bit or 16-bit microprocessors
• Precision instrumentation utilizing unipolar signal ranges

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and temperature grade. Ensure supply chain sources provide valid traceability for military-grade components. Cross-reference pin configurations with official datasheets prior to integration. Confirm RoHS compliance status if required by system specifications.

Selection Notes

Select this component when a single-channel 12-bit resolution is required with a unipolar 0 V to +5 V input range. The T suffix indicates suitability for extended industrial or military temperature ranges up to +125°C. Consider the integrated reference and clock features to minimize external component count. Verify interface requirements match the available parallel, byte, or serial modes.

Part Context

The AD7875TQ belongs to the AD7870/AD7875/AD7876 family of 12-bit sampling ADCs. While sharing identical architecture and performance metrics, the AD7875 variant is distinguished by its unipolar 0 V to +5 V input range, unlike the bipolar ±3 V (AD7870) or ±10 V (AD7876) options. All variants utilize LC2MOS technology and offer similar dynamic specifications.

Replacement Considerations

The AD7875KNZ serves as a commercial grade replacement within the same family. For hermetic ceramic packages, the AD7875BQ is the equivalent option. Substitutes must maintain the 12-bit SAR architecture and ±5 V supply requirements.