AD7892BR-2

Overview

The AD7892BR-2 is a single-supply, 12-bit successive approximation analog-to-digital converter (ADC) fabricated in Analog Devices' LC2MOS process. It operates from a +5 V supply and features an on-chip track/hold amplifier with a 400 ns acquisition time. The device supports a throughput rate of 500 kSPS and accepts a unipolar analog input range of 0 V to +2.5 V. It offers flexible parallel and serial interface options for microprocessor connectivity. DC accuracy specifications include ±1 LSB relative accuracy and ±1 LSB differential nonlinearity. Power consumption is typically 60 mW in normal operation.

Feature Summary

• Integrated signal scaling allows direct interfacing with 0 V to +2.5 V analog signals while operating from a single +5 V supply.
• Versatile interface logic supports both high-speed parallel connections and three-wire serial communication modes selectable via the MODE pin.
• On-chip track/hold amplifier ensures accurate conversion of full-scale amplitude sine waves up to the Nyquist rate.
• Built-in overvoltage protection safeguards analog inputs against damage during transient voltage events.

Applications

• Portable instrumentation systems requiring low power consumption
• Industrial data acquisition modules
• Microcontroller-based measurement systems

Procurement Notes

Verify the specific suffix 'BR-2' corresponds to the SOIC package, ±1 LSB accuracy grade, and 0 V to +2.5 V input range configuration. Confirm that the ordering information matches the required temperature range of -40 °C to +85 °C. Ensure compatibility with the intended system's voltage levels and interface requirements before procurement.

Selection Notes

Select this component when a 12-bit resolution and 500 kSPS sampling rate are sufficient for the application. The BR-2 variant is appropriate for designs requiring ±1 LSB accuracy and a 0 V to +2.5 V input range. Consider the SOIC package format for surface-mount assembly. Evaluate if the internal reference or external reference option better suits the system's precision needs.

Part Context

The AD7892 series comprises high-speed, low-power 12-bit ADCs available in multiple input range configurations. The BR-2 specifically denotes the commercial temperature range version with improved accuracy and the unipolar input specification. It belongs to the broader family of LC2MOS converters designed for single-supply operation.

Replacement Considerations

Direct replacements within the same family include AD7892BN-2 for DIP packaging or AD7892AR-2 for alternative SOIC sourcing. Verify that substitute parts maintain the identical 0 V to +2.5 V input range and 500 kSPS throughput specifications.

FAQ

What is the analog input voltage range for the AD7892BR-2?

The AD7892BR-2 accepts a unipolar analog input voltage range of 0 V to +2.5 V.

How is the interface mode selected on the AD7892?

The interface mode is selected by the state of the MODE pin. A logic high selects the parallel interface mode, while a logic low selects the serial interface mode.

Does the AD7892BR-2 have overvoltage protection?

Yes, the AD7892 provides overvoltage protection on the analog inputs to prevent damage from excessive voltage levels.