AD7899AR-1

Overview

The AD7899AR-1 is a 14-bit successive-approximation analog-to-digital converter operating from a single 5 V supply. It achieves 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 supports bipolar input ranges of ±5 V and ±10 V, utilizing two's complement output coding. Key electrical parameters include a typical power dissipation of 80 mW in normal mode and 125 µW in standby. The part features overvoltage protection on analog inputs, an internal 2.5 V reference, and a high-speed parallel interface compatible with 3 V or 5 V logic levels.

Feature Summary

• Integrated signal conditioning circuitry allows direct acceptance of standard industrial voltage ranges without external scaling components.
• High-speed parallel data bus enables efficient interfacing with microprocessors and digital signal processors.
• Analog inputs are protected against overvoltage conditions to prevent device damage during operation.
• Flexible clocking options support both internal oscillator generation and external clock synchronization.

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

Procurement Notes

Verify the specific suffix AR-1 corresponds to the SOIC-28 package and the -40°C to +85°C commercial temperature range. Confirm that the ordering code matches the required ±5 V and ±10 V input range configuration. Check for RoHS compliance status if environmental regulations apply to the target assembly. Ensure the source document explicitly lists this exact part number to avoid confusion with the BR-1 or SR-1 variants which differ in accuracy or temperature rating.

Selection Notes

Select the AD7899AR-1 when bipolar signals within ±10 V must be digitized at 400 kSPS without external amplifiers. The internal 2.5 V reference simplifies board layout compared to external reference solutions. Consider the parallel interface requirements for PCB trace matching if signal integrity is critical at high speeds. The 80 mW power consumption makes it suitable for thermally constrained enclosures where active cooling is not feasible.

Part Context

The AD7899 series includes variants with different input ranges and accuracies. The AD7899AR-1 specifically targets applications needing ±5 V and ±10 V ranges with ±2 LSB integral nonlinearity. Other family members like the AD7899AR-2 offer unipolar ranges, while the AD7899SR-1 extends the temperature range to military specifications. This part represents the standard commercial grade solution for general-purpose high-speed conversion.

Replacement Considerations

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