AD7893BN-2

Overview

The AD7893BN-2 is a 12-bit successive approximation analog-to-digital converter (ADC) housed in an 8-pin mini-DIP package. It operates from a single +5 V supply and consumes 25 mW typically. The device features a 6 μs conversion time, a track/hold amplifier, and a high-speed serial interface. It supports input ranges of 0 V to +2.5 V with straight binary output coding. Key specifications include a signal-to-noise ratio of 72 dB, ±1/2 LSB relative accuracy, and operation within a temperature range of –40 °C to +85 °C.

Feature Summary

• Integrated on-chip track/hold amplifier for accurate signal acquisition
• High-speed two-wire serial interface for simplified microcontroller connection
• Single +5 V supply operation with low power consumption
• Internal clock generation eliminates external timing components

Applications

• Battery-powered portable instrumentation
• Industrial process control systems
• Data acquisition modules

Procurement Notes

Verify the specific suffix BN-2 corresponds to the plastic mini-DIP package variant with 72 dB SNR and ±1/2 LSB linearity. Confirm the operating temperature range meets system requirements of –40 °C to +85 °C. Ensure the external reference voltage is set to +2.5 V for optimal performance. Check that the application circuit respects the absolute maximum ratings for input voltages and supply rails.

Selection Notes

Select this component when a compact 8-pin solution is required for 12-bit conversion. The BN-2 variant offers improved linearity compared to the AN version. Consider the 6 μs conversion speed and 117 kHz throughput rate against system latency needs. Verify compatibility with the available serial clock frequencies up to 8.33 MHz for data readout.

Part Context

The AD7893 series utilizes Analog Devices' LC2MOS process, combining precision bipolar circuits with low-power CMOS logic. This technology enables the integration of the ADC, track/hold, and serial interface into a minimal footprint. The BN-2 designation specifically identifies the commercial grade version with enhanced linearity specifications within the standard 8-pin dual-in-line form factor.

Replacement Considerations

The AD7893AN-2 serves as a lower-cost alternative with 70 dB SNR and ±1 LSB accuracy. For SOIC package requirements, the AD7893BR-2 provides equivalent electrical characteristics in surface-mount format. Both options maintain the same pinout and functional compatibility.