AD7899SR-1REEL7

Overview

The AD7899SR-1REEL7 is a 14-bit successive-approximation analog-to-digital converter (ADC) from Analog Devices, designed for single-supply 5 V operation. It features a throughput rate of 400 kSPS with a conversion time of 2.2 µs and an acquisition time of 0.3 µs. The device includes an internal 2.5 V reference, on-chip clock oscillator, and signal conditioning circuitry. It supports input ranges of ±10 V, ±5 V, ±2.5 V, 0 V to 2.5 V, and 0 V to 5 V. The part operates within a temperature range of -55°C to +125°C and consumes typically 80 mW in normal mode.

Feature Summary

• High-speed parallel interface compatible with 3 V and 5 V processors
• Integrated track/hold amplifier with overvoltage protection on analog inputs
• Selectable internal or external clock sources for conversion timing control
• Power-saving standby mode accessible via the STBY pin

Applications

• Industrial process control systems requiring high-resolution data acquisition
• Portable instrumentation powered by single 5 V supplies
• Digital signal processing interfaces needing fast parallel data transfer
• Multi-channel sampling applications utilizing matched aperture delay

Procurement Notes

Verify the specific suffix REEL7 indicates tape-and-reel packaging when sourcing this component. Confirm that the SR designation corresponds to the extended military temperature range (-55°C to +125°C). Ensure compatibility with existing board layouts for the 28-lead SOIC package before procurement.

Selection Notes

Select the AD7899SR-1REEL7 when bipolar input ranges such as ±10 V or ±5 V are required alongside high-speed parallel interfacing. Consider the internal 2.5 V reference tolerance if system accuracy demands tighter specifications, potentially necessitating an external precision reference. Evaluate power consumption requirements against the 80 mW typical dissipation in active mode.

Part Context

This component belongs to the AD7899 family of 14-bit SAR ADCs. The 'SR' suffix denotes the industrial/military temperature grade variant housed in a Small Outline package. The 'REEL7' suffix specifies the reel packaging format for automated assembly. This model represents the standard version handling bipolar input ranges.

Replacement Considerations

Direct replacements include other AD7899 variants with different temperature grades or packaging options, such as the AD7899AR-1 for commercial temperature ranges. Cross-family upgrades may involve higher resolution ADCs from Analog Devices, though interface and pinout compatibility must be verified.