AD7875CQ

Overview

The AD7875CQ is a monolithic 12-bit successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates from ±5 V power supplies and features an internal 3 V buried Zener reference, a track-and-hold amplifier, and a laser-trimmed clock oscillator. The device supports a unipolar input voltage range of 0 V to +5 V with a maximum sampling rate of 100 kHz. Key electrical specifications include a typical signal-to-noise ratio of 72 dB at a 10 kHz input frequency, a conversion time of 6.5 μs to 9 μs, and a data access time of 57 ns. It offers parallel, byte, and serial digital interface options.

Feature Summary

• Integrated complete 12-bit ADC solution combining SAR architecture, track-and-hold amplifier, and internal reference on a single chip.
• Versatile digital interface supporting 12-bit parallel, two-byte, and serial data output formats for flexible microprocessor interfacing.
• Fast bus access times compatible with modern 8-bit and 16-bit microprocessors and digital signal processors.
• Internal laser-trimmed clock ensures accurate conversion timing without external clock components.

Applications

• Data acquisition systems requiring high-speed 12-bit resolution.
• Digital signal processing applications needing dynamic performance specifications.
• Industrial control systems utilizing standard TTL-compatible logic interfaces.

Procurement Notes

Verify the specific suffix 'CQ' against the manufacturer's current ordering guide, as datasheet documentation primarily references commercial (K, L) and industrial (B, C) temperature grades. Confirm package availability, as the AD7875 series is offered in DIP, PLCC, and SOIC packages. Ensure compatibility with ±5 V supply requirements and check for any discontinuation notices or lifecycle status updates directly from Analog Devices.

Selection Notes

Select the AD7875CQ when a unipolar 0 V to +5 V input range is required, distinguishing it from the bipolar AD7870 (±3 V) and AD7876 (±10 V). Consider this part for designs needing integrated reference and clock functionality to minimize external component count. Verify that the industrial temperature range (-40°C to +85°C) meets system environmental requirements compared to commercial variants.

Part Context

The AD7875CQ belongs to the AD7870/AD7875/AD7876 family of fast, complete 12-bit sampling ADCs. While sharing core architecture with the AD7870 and AD7876, the AD7875 is specifically configured for unipolar operation. This family provides a cost-effective solution for applications requiring moderate speed and high accuracy without complex external timing or reference circuitry.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Cross-referencing should be performed using the manufacturer's official replacement matrix or distributor substitution tools to identify equivalent devices with matching pinouts and specifications.