AD7899BRZ-1

Overview

The AD7899BRZ-1 is a 14-bit successive-approximation analog-to-digital converter (ADC) operating from a single 5 V supply. It achieves a maximum throughput rate of 400 kSPS with a conversion time of 2.2 µs and a track/hold acquisition time of 0.3 µs. The device supports bipolar input ranges of ±5 V and ±10 V, utilizing two's complement output coding. Key electrical specifications include a typical signal-to-noise ratio of 78 dB, integral nonlinearity of ±1.5 LSB, and differential nonlinearity of ±1 LSB. Power consumption is typically 80 mW in normal mode and reduces to 100 µW in standby mode via the STBY pin.

Feature Summary

• Integrated high-speed parallel interface compatible with both 3 V and 5 V logic levels for direct processor connection.
• Built-in overvoltage protection on analog inputs allows operation beyond specified voltage ranges without damage.
• Flexible clocking architecture supports either an internal laser-trimmed oscillator or an external clock source.

Applications

• Industrial process control systems requiring high-resolution data acquisition.
• Portable instrumentation powered by single-supply batteries.
• Data acquisition modules interfacing with microcontrollers or DSPs.

Procurement Notes

Verify the specific suffix 'B' indicates the ±1.5 LSB accuracy grade compared to the standard ±2 LSB variant. Confirm the package type matches the required PCB layout, as the component is available in SOIC and SSOP formats. Ensure the design accounts for the commercial temperature range of -40°C to +85°C. Cross-reference the ordering guide to confirm availability of the BRZ-1 designation versus older non-compliant variants.

Selection Notes

Select this model when bipolar input signals within ±5 V or ±10 V ranges are required. The BRZ-1 variant offers tighter linearity accuracy than the ARZ-1 version. Consider the AD7899ARZ-1 if standard industrial accuracy suffices, or the AD7899SRZ-1 for extended military temperature ranges. Ensure the system requires a parallel interface rather than the serial alternative found in the AD7894 series.

Part Context

The AD7899 belongs to Analog Devices' family of fast, low-power 14-bit ADCs. The BRZ-1 suffix specifically denotes the B-grade accuracy version housed in a RoHS-compliant SOIC-28 package. This part serves as a bridge between high-speed performance and power efficiency, distinct from the unipolar AD7899-2 or the narrower range AD7899-3.

Replacement Considerations

Public confirmed substitute: AD7899ARZ-1 (Standard accuracy), AD7899SRZ-1 (Extended temperature).