AD7899BR-1REEL7

Overview

The AD7899BR-1REEL7 is a 14-bit successive-approximation analog-to-digital converter manufactured by Analog Devices. It operates from a single 5 V supply and delivers a maximum throughput rate of 400 kSPS with a conversion time of 2.2 µs. The device features an internal 2.5 V reference, on-chip clock oscillator, and high-speed parallel interface compatible with 3 V or 5 V processors. This specific variant supports bipolar input ranges of ±5 V and ±10 V. It is housed in a 28-lead Small Outline (SOIC) package and functions within a temperature range of -40°C to +85°C.

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, microcontrollers, and digital signal processors.
• Analog inputs include overvoltage protection to prevent damage when input voltages exceed specified limits.

Applications

• Industrial process control systems requiring precise analog signal acquisition
• Data acquisition modules for monitoring sensor outputs
• Portable instrumentation powered by single-supply batteries

Procurement Notes

Verify the ordering suffix REEL7 confirms tape-and-reel packaging rather than tube distribution. Confirm the BR suffix indicates the specific accuracy grade and SOIC package type. Ensure the -1 designation matches the required ±5 V or ±10 V bipolar input range for the target application design.

Selection Notes

Select this component when a 14-bit resolution and 400 kSPS speed are required for bipolar signals. The internal reference simplifies board layout compared to external reference designs. Consider the parallel interface requirements and available GPIO pins on the host processor before finalizing the selection.

Part Context

This part belongs to the AD7899 family of fast, low-power ADCs. The BR-1 variant specifically targets industrial applications needing ±5 V or ±10 V input ranges. It shares core architecture with the AR and SR versions but differs in accuracy specifications and operating temperature ranges.

Replacement Considerations

The AD7899AR-1REEL7 serves as a lower-cost alternative with slightly different accuracy specifications. The AD7899SR-1 offers extended military temperature range capabilities. Verify pin compatibility and timing parameters when substituting these variants.