AD7899BR-3

Overview

The AD7899BR-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 a ±2.5 V input range, ±1.5 LSB relative accuracy (INL), and ±1 LSB differential nonlinearity (DNL). Typical power consumption is 80 mW in normal mode and 20 µW in standby. It includes an internal 2.5 V reference, on-chip clock oscillator, and overvoltage protection. The component utilizes a high-speed parallel interface compatible with 3 V or 5 V logic and is housed in a 28-lead SOIC package.

Feature Summary

• Integrated signal conditioning circuitry supporting multiple bipolar and unipolar input ranges without external scaling components.
• High-speed parallel data bus interface enabling direct connection to microprocessors and digital signal processors.
• Built-in overvoltage protection on analog inputs prevents damage during voltage excursions beyond the selected range.
• Configurable power management allows operation in low-power standby mode via the STBY pin.

Applications

• Industrial process control systems requiring precise temperature and pressure monitoring.
• Portable instrumentation utilizing single-supply battery operation.
• Data acquisition modules interfacing with 3 V or 5 V microcontrollers.
• Medical equipment requiring isolated signal digitization.

Procurement Notes

Verify the specific suffix BR-3 against the manufacturer's current ordering guide to confirm package type and temperature grade. Ensure the design supports the required ±2.5 V input range and parallel interface timing constraints. Confirm RoHS compliance status for the specific manufacturing lot prior to integration into production assemblies.

Selection Notes

Select this variant when a ±2.5 V input range is required rather than the wider ±10 V or ±5 V options available in other family members. The BR suffix indicates improved linearity accuracy compared to standard AR versions. Ensure the application can accommodate the 28-lead SOIC footprint and provides adequate thermal dissipation for the 80 mW typical power dissipation.

Part Context

The AD7899 series comprises fast, low-power 14-bit ADCs designed for single-supply applications. The AD7899BR-3 specifically targets applications needing a ±2.5 V input range with enhanced accuracy. It belongs to a family that also offers ±10 V, ±5 V, and unipolar variants, all sharing the same core architecture and interface specifications.

Replacement Considerations

The AD7899ARZ-3 serves as a functional equivalent within the same family, offering identical electrical performance but with standard ±2 LSB accuracy instead of the improved ±1.5 LSB found in the BR version. Verify pin compatibility and software register settings remain unchanged during substitution.