AD7893BNZ-2

Overview

The AD7893BNZ-2 is a 12-bit successive approximation analog-to-digital converter (ADC) fabricated in Analog Devices' LC2MOS process. It operates from a single +5 V supply and consumes typically 25 mW. The device features an on-chip track/hold amplifier, internal clock, and a high-speed two-wire serial interface. It accepts a unipolar analog input range of 0 V to +2.5 V. Key performance specifications include a maximum conversion time of 6 μs, a track/hold acquisition time of 1.5 μs, and a relative accuracy of ±1/2 LSB. The signal-to-noise ratio is specified at 72 dB min, with total harmonic distortion of -80 dB max.

Feature Summary

• Integrated signal scaling for direct handling of 0 V to +2.5 V analog inputs without external attenuation 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 microcontrollers and DSP processors using standard SCLK and SDATA lines.
• Single +5 V supply operation enables efficient power management suitable for battery-powered applications.

Applications

• Portable instrumentation systems requiring low power consumption and compact packaging.
• Industrial data acquisition systems utilizing serial communication protocols.
• Battery-operated measurement devices needing single-supply operation.

Procurement Notes

Verify the specific suffix 'BNZ-2' against the manufacturer's current ordering guide to confirm package type and temperature range compliance. Ensure the reference voltage source matches the required +2.5 V specification for optimal linearity. Confirm that the system timing allows for the 6 μs conversion window and 600 ns acquisition gap for maximum throughput rates.

Selection Notes

Select this component when a 12-bit resolution and 0 V to +2.5 V input range are required within an 8-pin footprint. Consider the AD7893BNZ-2 over other variants if the application demands higher linearity (±1/2 LSB) compared to the standard ±1 LSB version. Evaluate the 117 kHz throughput capability against system sampling requirements before finalizing the design.

Part Context

The AD7893 belongs to a family of fast, low-power ADCs designed for space-constrained applications. The BNZ-2 designation indicates a commercial temperature range (-40°C to +85°C), SOIC package, and specific linearity grade. This part integrates functions typically requiring multiple discrete components into a single monolithic IC.

Replacement Considerations

Direct pin-compatible replacements within the same series include the AD7893ANZ-2 for lower cost or the AD7893BRZ-2 for extended temperature ranges. Verify that substitute parts maintain the same 0 V to +2.5 V input range and serial interface timing characteristics.