AD7899ARSZ-3REEL

Overview

The AD7899ARSZ-3REEL is a 14-bit, 400 kSPS analog-to-digital converter from Analog Devices Inc., operating on a single 5 V supply. It features an internal 2.5 V reference and accepts an analog input range of ±2.5 V. The device includes a track/hold amplifier with a maximum acquisition time of 0.3 µs and a conversion time of 2.2 µs. It offers overvoltage protection on analog inputs, allowing voltages up to –4 V or +18 V without damage. Power consumption is typically 80 mW in normal mode and drops to 20 µW in standby mode. The part utilizes a high-speed parallel interface compatible with both 3 V and 5 V logic levels.

Feature Summary

• Integrated 2.5 V reference and laser-trimmed clock oscillator for simplified system design
• High-speed parallel data bus supporting interfacing with 3 V and 5 V processors
• Overvoltage protection on analog inputs prevents damage from voltage excursions
• Dedicated standby pin enables low-power operation when the device is not actively converting

Applications

• Industrial process control systems requiring ±2.5 V signal conditioning
• Portable instrumentation benefiting from single-supply low-power operation
• Data acquisition systems interfacing with 3 V microcontrollers or DSPs
• Multi-channel sampling applications utilizing matched aperture delay characteristics

Procurement Notes

Verify that the ordering suffix 'REEL' confirms tape-and-reel packaging rather than tube. Confirm the 'Z' suffix indicates lead-free compliance. Ensure the '-3' designation matches the required ±2.5 V input range specification for your application circuit. Cross-reference the manufacturer's latest datasheet revision to confirm pinout and electrical parameter consistency before finalizing procurement orders.

Selection Notes

Select this variant specifically for its ±2.5 V bipolar input range capability. The AD7899-1 handles ±5 V/±10 V ranges, while the AD7899-2 supports unipolar 0 V to 5 V/2.5 V ranges. This model provides two's complement output coding suitable for bipolar signal processing. Consider the internal reference tolerance if external precision references are required for higher accuracy applications.

Part Context

This component belongs to the AD7899 family of fast, low-power 14-bit ADCs. The family differentiates models by analog input range: -1 for ±5 V/±10 V, -2 for 0 V to 5 V/2.5 V, and -3 for ±2.5 V. All variants share identical architecture, throughput rates, and power characteristics, differing only in input scaling resistors and output coding conventions.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing board layouts and software drivers if considering alternative ADC families.