AD7894ARZ-2

Overview

The AD7894ARZ-2 is a 14-bit successive approximation analog-to-digital converter housed in an 8-lead SOIC package. It operates from a single +5 V supply and features a serial interface with a maximum throughput rate of 160 kHz. The device accepts a unipolar analog input range of 0 V to +2.5 V and utilizes an external reference voltage. Key electrical specifications include a typical power dissipation of 20 mW, a signal-to-noise ratio of 77 dB, and a conversion time of 5 µs. The component supports an operating temperature range from -40°C to +85°C.

Feature Summary

• Integrates a track/hold amplifier and on-chip clock for simplified system design
• Features a high-speed two-wire serial interface for easy microprocessor connection
• Includes an automatic power-down mode that activates after conversion completion

Applications

• Battery-powered portable instrumentation systems
• Industrial process control data acquisition
• Medical equipment requiring low-power signal digitization

Procurement Notes

Verify the specific suffix designation against official documentation to confirm the input voltage range and accuracy grade. Ensure the ordering information matches the required thermal performance and packaging type before finalizing procurement plans.

Selection Notes

Select this component when a single-supply operation is required alongside a unipolar input range. The integrated track/hold amplifier reduces external component count compared to discrete solutions. Verify that the serial interface timing meets the host processor's requirements for the desired sampling rate.

Part Context

This part belongs to the AD7894 family of fast 14-bit ADCs. The ARZ-2 suffix specifically denotes the version optimized for a 0 V to +2.5 V input range. It serves as a pin-compatible upgrade to older 12-bit devices while offering higher resolution and lower power consumption within the same compact package.

Replacement Considerations

The AD7894ARZ-3 is a pin-compatible alternative offering a bipolar input range instead of the unipolar configuration found in the AD7894ARZ-2.