AD7899AR-3

Overview

The AD7899AR-3 is a 14-bit successive-approximation analog-to-digital converter operating from a single 5 V supply. It features a throughput rate of 400 kSPS with a conversion time of 2.2 µs and a track/hold acquisition time of 0.3 µs. The device accepts an analog input range of ±2.5 V and utilizes a high-speed parallel interface compatible with 3 V or 5 V processors. Typical power consumption is 80 mW in normal mode, reducing to 20 µW in standby. It includes an internal 2.5 V reference and overvoltage protection on analog inputs.

Feature Summary

• Integrated 2.5 V reference and laser-trimmed clock oscillator
• High-speed parallel interface supporting 3 V and 5 V logic levels
• Overvoltage protection on analog inputs prevents damage during voltage excursions

Applications

• Portable instrumentation systems requiring low power consumption
• Industrial data acquisition systems with bipolar signal ranges
• Process control applications interfacing with microprocessors

Procurement Notes

Verify the specific suffix 'AR-3' corresponds to the ±2.5 V input range and commercial temperature grade (-40°C to +85°C) when sourcing. Confirm package availability matches the required SOIC-28 form factor. Ensure the design supports the 5 V single-supply requirement and appropriate decoupling for the VREF pin.

Selection Notes

Select this component when a 14-bit resolution and 400 kSPS speed are required for bipolar signals within a ±2.5 V range. Consider the AD7899-1 if wider ±5 V or ±10 V ranges are needed, or the AD7899-2 for unipolar applications. Evaluate the external clock option via CLKIN if precise timing synchronization with other system components is necessary.

Part Context

The AD7899 series comprises fast, low-power 14-bit ADCs designed for single-supply operation. The AD7899AR-3 specifically targets applications needing a ±2.5 V input range. It belongs to a family that offers different input configurations and accuracy grades, sharing common architecture features like the SAR core and parallel interface.

Replacement Considerations

Public confirmed substitute part numbers: None identified in verified documentation.