AD7894BRZ-3

Overview

The AD7894BRZ-3 is a fast, 14-bit successive approximation analog-to-digital converter (ADC) housed in an 8-lead SOIC package. It operates from a single +5 V supply and consumes typically 20 mW. The device features an on-chip track/hold amplifier, an internal clock, and a high-speed serial interface. It accepts bipolar analog input signals ranging from -2.5 V to +2.5 V and requires an external +2.5 V reference voltage. The part guarantees no missing codes at 14-bit resolution with a maximum conversion time of 5 µs in high sampling mode.

Feature Summary

• Integrated signal scaling allows direct handling of bipolar analog inputs without external conditioning circuitry.
• On-chip track/hold amplifier ensures accurate digitization of full-scale sine waves up to the Nyquist rate.
• Two-wire serial interface simplifies connection to microprocessors and digital signal processors.
• Automatic power-down mode reduces energy consumption by entering standby after each conversion cycle.

Applications

• Battery-powered portable instrumentation systems
• Industrial process control data acquisition
• Medical equipment requiring low-power signal digitization

Procurement Notes

Verify that the specific ordering suffix corresponds to the required temperature range and input voltage configuration. Confirm that the component meets RoHS compliance standards for the intended market. Ensure the procurement source provides valid traceability documentation for quality assurance purposes.

Selection Notes

Select this model when a single-supply operation is required alongside a bipolar input range of ±2.5 V. Consider the 14-bit resolution and 5 µs conversion speed for applications demanding moderate throughput rates. Evaluate the need for an external voltage reference to ensure system accuracy matches the specified linearity parameters.

Part Context

This component belongs to the AD7894 family of 14-bit serial ADCs manufactured by Analog Devices. It serves as a pin-compatible upgrade to the 12-bit AD7895, offering higher resolution within the same compact 8-lead SOIC footprint. The BRZ suffix indicates a specific commercial grade variant within the broader product series.

Replacement Considerations

The AD7894ARZ-3 is a verified substitute offering identical electrical specifications but potentially different manufacturing lot characteristics. Verify pin compatibility and thermal performance before implementing any cross-model replacement in existing designs.