AD7893ARZ-3

Overview

The AD7893ARZ-3 is a 12-bit successive approximation analog-to-digital converter housed in an 8-pin SOIC package. It operates from a single +5 V supply with typical power dissipation of 25 mW. The device features an on-chip track/hold amplifier and accepts a bipolar input voltage range of ±2.5 V. Conversion time is 6 μs maximum, with a track/hold acquisition time of 1.5 μs maximum. It utilizes a two-wire serial interface for data output, providing 12 bits of resolution with two's complement coding. The reference input requires a nominal +2.5 V source.

Feature Summary

• Integrated signal scaling circuitry enables direct acceptance of ±2.5 V analog input signals without external attenuation components.
• On-chip track/hold amplifier ensures accurate sampling of input signals up to the Nyquist rate during conversion cycles.
• High-speed serial interface reduces pin count requirements by utilizing only serial clock and serial data output lines for communication.

Applications

• Battery-powered portable instrumentation requiring low power consumption
• Industrial process control systems utilizing bipolar sensor inputs
• Data acquisition modules interfacing with microcontrollers via serial protocols

Procurement Notes

Verify the ordering suffix 'ARZ' corresponds to the specific temperature range (-40°C to +85°C) and lead-free packaging configuration required for your assembly process. Confirm that the '3' designation matches the ±2.5 V input range specification. Ensure compatibility with existing board layouts designed for the 8-pin SOIC footprint before finalizing procurement orders.

Selection Notes

Select this component when a bipolar input range of ±2.5 V is required alongside a compact 8-pin form factor. The AD7893ARZ-3 is suitable for applications needing 12-bit resolution at throughput rates up to 117 kHz. Consider alternative models if unipolar inputs or higher input voltage ranges are necessary, as the internal scaling is fixed per part number variant.

Part Context

The AD7893 series comprises four variants differentiated by input voltage range: ±10 V, ±2.5 V, 0 to +5 V, and 0 to +2.5 V. The AD7893ARZ-3 specifically addresses the ±2.5 V bipolar application. All variants share identical architecture, including the 12-bit SAR core, serial interface, and power specifications, differing only in the analog front-end scaling network.

Replacement Considerations

Direct functional substitutes within the same family include AD7893AN-3 (DIP package) or AD7893BR-3 (higher linearity grade). Cross-package replacements require verification of pinout compatibility between SOIC and DIP/QFN formats. No other manufacturers offer identical integrated scaling and serial interface combinations in this specific package.