AD7896SQ

Overview

The AD7896SQ is a 12-bit successive approximation register (SAR) analog-to-digital converter manufactured by Analog Devices Inc. It operates from a single 2.7 V to 5.5 V supply and features an on-chip track-and-hold amplifier, internal clock, and high-speed serial interface. The device accepts a unipolar analog input range of 0 V to VDD, utilizing the supply voltage as the reference. Key electrical specifications include a maximum throughput rate of 100 kS/s, a conversion time of 8 µs in high sampling mode, and a typical power dissipation of 9 mW. The component is housed in an 8-lead SOIC or PDIP package and supports an extended operating temperature range from -55°C to +125°C.

Feature Summary

• Integrated 12-bit SAR ADC with on-chip track-and-hold amplifier and internal clock generation.
• High-speed 2-wire serial interface compatible with standard microcontrollers and DSP processors.
• Automatic power-down mode for low-power applications, reducing current consumption during idle periods.
• Single-supply operation with VDD serving as both power source and analog reference.

Applications

• Battery-powered portable instrumentation requiring low power consumption.
• Industrial data acquisition systems operating in harsh environments.
• Process control loops requiring fast sampling rates and serial connectivity.

Procurement Notes

Verify the specific suffix 'SQ' against official Analog Devices documentation to confirm the extended temperature grade (-55°C to +125°C) and hermetic packaging options if applicable. Ensure that the ordering information matches the exact package style required for your PCB layout. Cross-reference the datasheet revision to confirm pinout compatibility with existing designs.

Selection Notes

Select this component when a compact 12-bit resolution is required alongside a minimal external component count. The integrated reference eliminates the need for external voltage references, saving board space. Consider the 100 kHz throughput limit and 8 µs conversion time to ensure it meets the system's real-time processing requirements.

Part Context

The AD7896 belongs to a family of fast, 12-bit sampling A/D converters designed for space-constrained applications. It consolidates the functions of a track-and-hold amplifier, ADC, and serial interface into a single 8-lead package. This integration significantly reduces the footprint compared to discrete solutions, making it suitable for dense circuit board layouts.

Replacement Considerations

Direct replacements within the same family include the AD7896JR and AD7896ARZ. Verify that the replacement part number matches the required temperature range and package type. Note that the AD7896JR is listed as obsolete in some distributor databases, with the AD7896JRZ serving as the active equivalent.