AD7899AR-3REEL

Overview

The AD7899AR-3REEL is a 14-bit successive-approximation analog-to-digital converter operating from a single 5 V supply. It delivers a maximum 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 features an internal 2.5 V reference and accepts bipolar input ranges of ±2.5 V. It utilizes a high-speed parallel interface compatible with 3 V or 5 V logic levels via the VDRIVE pin. Typical power consumption is 80 mW in normal mode, reducing to 125 µW in standby. The component is housed in a 28-lead SOIC package.

Feature Summary

• Integrated on-chip track/hold amplifier and laser-trimmed clock oscillator for simplified system design.
• High-speed parallel data bus allows direct interfacing with microprocessors and DSPs.
• Analog inputs include overvoltage protection to prevent damage during signal excursions.
• Configurable digital interface supports both 3 V and 5 V processor logic levels.

Applications

• Industrial process control systems requiring high-resolution data acquisition.
• Portable instrumentation powered by single-supply batteries.
• Digital signal processing front-ends for audio or vibration analysis.
• Medical equipment utilizing bipolar signal conditioning.

Procurement Notes

Verify the specific suffix REEL indicates tape-and-reel packaging when sourcing components. Confirm that the AR designation corresponds to the commercial temperature range of -40°C to +85°C. Ensure the -3 variant matches the required ±2.5 V input range for the target application circuit.

Selection Notes

Select this model specifically for applications requiring a bipolar ±2.5 V input range. If unipolar or wider bipolar ranges are needed, consider the AD7899-1 or AD7899-2 variants. Verify that the system requires a parallel interface rather than serial alternatives like the AD7894. Ensure the 400 kSPS throughput meets the Nyquist requirements for the input signal bandwidth.

Part Context

The AD7899 belongs to Analog Devices' family of fast, low-power 14-bit ADCs. This series distinguishes itself by integrating the track/hold, reference, and clock circuits into a single monolithic chip. The AD7899AR-3REEL represents the commercial grade version packaged in reels for automated assembly, differing from tube-packaged equivalents.

Replacement Considerations

The AD7899BR-3 offers identical functionality with tighter accuracy specifications (±1.5 LSB INL). The AD7899ARS-3 provides the same electrical performance in a shrink small-outline package. Cross-model substitution requires verifying input range compatibility and physical footprint constraints.