AD7899ARS-2

Overview

The AD7899ARS-2 is a 14-bit successive-approximation analog-to-digital converter (ADC) 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 features an internal 2.5 V reference and accepts unipolar input ranges of 0 V to 2.5 V or 0 V to 5 V. It utilizes a high-speed parallel interface compatible with 3 V and 5 V logic levels. The component is housed in a 28-lead Shrink Small Outline Package (SSOP) and operates within a temperature range of -40°C to +85°C.

Feature Summary

• Integrated signal conditioning circuitry allows direct acceptance of ±10 V, ±5 V, ±2.5 V, 0 V to 2.5 V, and 0 V to 5 V input ranges without external scaling components.
• Analog inputs include overvoltage protection, permitting voltage excursions beyond the selected input range without damage to the device.
• The digital interface supports both 3 V and 5 V processor connections through the VDRIVE pin configuration.

Applications

• Industrial process control systems requiring isolated or scaled sensor data acquisition
• Portable instrumentation powered by single-supply batteries
• Data acquisition modules interfacing with microcontrollers or DSPs

Procurement Notes

Verify the specific suffix 'ARS-2' against the manufacturer's current ordering guide to confirm package type and temperature grade. Ensure the design accommodates the 28-lead SSOP footprint and that the system power supply remains stable at 5 V ± 5%. Confirm that the unipolar input range matches the application requirements for the '-2' variant.

Selection Notes

Select the AD7899ARS-2 when a unipolar input range of 0 V to 5 V or 0 V to 2.5 V is required alongside a parallel interface. Choose this model over the '-1' or '-3' variants if bipolar inputs are not needed. Consider the SSOP package for space-constrained PCB layouts compared to the standard SOIC option.

Part Context

The AD7899 series comprises three distinct versions differentiated by analog input range capabilities. The '-1' version supports bipolar ±10 V and ±5 V ranges, while the '-3' version is limited to ±2.5 V. The AD7899ARS-2 specifically addresses applications requiring unipolar signals, offering 0 V to 5 V or 0 V to 2.5 V ranges within the same high-speed SAR architecture.

Replacement Considerations

Publicly confirmed substitute part numbers for the AD7899ARS-2 are not available in the provided documentation. Designers should consult Analog Devices for current equivalent products or verify compatibility with newer generation ADCs on a case-by-case basis.