AD7893ARZ-2

Overview

The AD7893ARZ-2 is a 12-bit successive approximation analog-to-digital converter (ADC) housed in an 8-pin SOIC package. It operates from a single +5 V supply and consumes 25 mW typical power. The device features a 6 μs conversion time, a track/hold amplifier, and a high-speed serial interface. It accepts unipolar input ranges of 0 V to +2.5 V with straight binary output coding. Key specifications include a signal-to-noise ratio of 70 dB, ±1 LSB differential nonlinearity, and an operating temperature range of -40 °C to +85 °C.

Feature Summary

• Integrates a 12-bit ADC, on-chip track/hold amplifier, clock oscillator, and serial interface logic within an 8-pin package.
• Operates from a single +5 V supply, consuming only 25 mW typical power for battery-powered applications.
• Provides a two-wire serial interface using SCLK and SDATA pins for easy connection to microcontrollers.
• Includes internal signal scaling to accept specific unipolar input voltage ranges without external components.

Applications

• Battery-powered portable instrumentation systems
• Industrial process control data acquisition
• Microcontroller-based measurement interfaces

Procurement Notes

Verify the ordering suffix 'ARZ-2' against the manufacturer's current datasheet to confirm the specific package type, temperature grade, and input range variant. Ensure the external reference voltage matches the required +2.5 V specification for proper operation.

Selection Notes

Select this component when a compact 12-bit ADC with low power consumption and a simple serial interface is required. Verify that the 0 V to +2.5 V input range aligns with the application signal levels. Consider the 6 μs conversion time and 117 kHz throughput rate for system timing requirements.

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 multiple functions into a small footprint while maintaining accuracy and low power dissipation suitable for space-constrained designs.

Replacement Considerations

The AD7895 is a pin-compatible upgrade offering higher resolution or speed variants. Verify compatibility by checking the input range, package dimensions, and serial interface timing requirements before substitution.

FAQ

What is the output coding format for the AD7893-2?

The AD7893-2 uses straight (natural) binary output coding.

How is the conversion initiated on the AD7893?

Conversion is initiated on the rising edge of the CONVST input signal.

What is the maximum serial clock frequency for reading data?

The serial clock frequency can reach up to 8.33 MHz to achieve the maximum throughput rate.