AD7899BRZ-3

Overview

The AD7899BRZ-3 is a 14-bit successive-approximation analog-to-digital converter operating from a single 5 V supply. It delivers a throughput rate of 400 kSPS with a conversion time of 2.2 µs and an acquisition time of 0.3 µs. The device features an internal 2.5 V reference and accepts bipolar input ranges of ±10 V, ±5 V, and ±2.5 V. It utilizes a high-speed parallel interface compatible with 3 V or 5 V logic levels. Typical power consumption is 80 mW in normal mode and 20 µW in standby. The component is housed in a 28-lead SOIC package and operates within a temperature range of -40°C to +85°C.

Feature Summary

• Integrated signal conditioning circuitry allows direct interfacing with standard industrial voltage ranges without external scaling components.
• Analog inputs include overvoltage protection, permitting voltage excursions beyond the selected input range without device damage.
• Digital interface supports both 3 V and 5 V logic levels via the VDRIVE pin, facilitating connection to various microprocessors and DSPs.

Applications

• Industrial process control systems requiring high-resolution data acquisition
• Portable instrumentation powered by single-supply batteries
• Data acquisition modules for digital signal processing applications

Procurement Notes

Verify the specific suffix 'B' indicates improved relative accuracy compared to the 'A' version. Confirm the 'RZ' suffix denotes RoHS compliance and lead-free termination. Ensure the package type matches the required PCB footprint. Check current availability status as legacy components may have limited stock.

Selection Notes

Select this model when bipolar input ranges such as ±2.5 V are required alongside high accuracy. The 'B' grade offers tighter integral nonlinearity specifications than the 'A' grade. Consider the parallel interface requirements and ensure sufficient GPIO pins are available on the host processor for the 14-bit data bus.

Part Context

This component belongs to the AD7899 family of fast, low-power ADCs. The BRZ-3 variant specifically targets applications needing ±2.5 V input range with enhanced linearity. It shares the core architecture with AD7899-1 and AD7899-2 models but differs in input configuration and accuracy grading.

Replacement Considerations

AD7899ARZ-3 serves as a lower-accuracy alternative within the same package. AD7899SR-3 provides extended temperature range capabilities for harsh environments. Verify pin compatibility and software register settings when substituting these variants.