AD7899AR-2

Overview

The AD7899AR-2 is a 14-bit successive-approximation analog-to-digital converter operating from a single 5 V supply. It achieves throughput rates up to 400 kSPS with a conversion time of 2.2 µs and track/hold acquisition time of 0.3 µs. The device features unipolar input ranges of 0 V to 2.5 V or 0 V to 5 V, utilizing straight binary output coding. It integrates an internal 2.5 V reference, on-chip clock oscillator, and high-speed parallel interface compatible with 3 V and 5 V logic. Typical power consumption is 80 mW in normal mode, reducing to 20 µW in standby.

Feature Summary

• High-speed parallel interface supporting 3 V and 5 V processor connections
• Integrated signal conditioning including track/hold amplifier and 2.5 V reference
• Overvoltage protection on analog inputs prevents damage during voltage excursions
• Configurable conversion clock via internal oscillator or external CLKIN pin

Applications

• Portable instrumentation requiring low power consumption
• Industrial data acquisition systems with unipolar sensor signals
• Microcontroller-based measurement systems interfacing via parallel bus

Procurement Notes

Verify the specific suffix AR-2 confirms the commercial temperature range (-40°C to +85°C) and SOIC-28 package. Confirm the -2 designation matches the required 0 V to 2.5 V or 0 V to 5 V unipolar input range rather than bipolar variants. Check RoHS compliance status for the specific manufacturing lot.

Selection Notes

Select this component when a 14-bit resolution and 400 kSPS speed are required for unipolar signals. Ensure the system supports a single 5 V supply. Consider the AD7899-1 if bipolar ±10 V or ±5 V ranges are needed instead. Verify that the parallel interface timing meets the microprocessor or DSP requirements for CS and RD signals.

Part Context

The AD7899 series comprises fast, low-power 14-bit ADCs designed for single-supply operation. The AD7899AR-2 specifically targets applications needing unipolar input scaling. It belongs to the broader AD7899 family which includes bipolar variants (-1 and -3) and different package options like SSOP. The device simplifies system design by integrating reference and clock circuitry.

Replacement Considerations

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