AD7893AN-2

Overview

The AD7893AN-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 features an on-chip track/hold amplifier, internal clock, and high-speed serial interface. The device accepts a unipolar analog input range of 0 V to +2.5 V and requires an external +2.5 V reference voltage. Key electrical specifications include a maximum conversion time of 6 μs, a typical power dissipation of 25 mW, and a signal-to-noise ratio of 70 dB at a sampling rate of 117 kHz. It is housed in an 8-pin plastic DIP package.

Feature Summary

• Integrates a 12-bit ADC, track/hold amplifier, and control logic within a compact 8-pin package for space-efficient designs.
• Operates from a single +5 V supply with low power consumption, making it suitable for battery-powered applications.
• Features a simple two-wire serial interface consisting of SCLK and SDATA lines for easy microcontroller integration.

Applications

• Battery-powered portable instrumentation
• Industrial data acquisition systems
• Process control monitoring

Procurement Notes

Verify the specific suffix AN-2 corresponds to the -40 °C to +85 °C temperature range and ±1 LSB linearity error. Confirm the package type is the N-8 plastic DIP. Ensure the design includes an external +2.5 V reference source, as the part does not contain an internal reference generator.

Selection Notes

Select this model when a unipolar 0 V to +2.5 V input range is required. For bipolar inputs, consider the AD7893-10 or AD7893-3 variants. If higher accuracy is needed, the BN-2 version offers ±1/2 LSB linearity. Ensure the system timing allows for the 6 μs conversion time plus read overhead to maintain specified dynamic performance.

Part Context

The AD7893 series utilizes Linear Compatible CMOS (LC2MOS) technology, combining precision bipolar circuits with low-power CMOS logic. This family provides various input scaling options within the same 8-pin footprint, allowing designers to choose between unipolar and bipolar ranges without changing the physical package dimensions.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.