AD7894ARZ-3

Overview

The AD7894ARZ-3 is a fast, 14-bit successive approximation analog-to-digital converter housed in an 8-lead SOIC package. It operates from a single +5 V supply and features an on-chip track/hold amplifier with a maximum conversion time of 5 µs. The device accepts a bipolar analog input voltage range of -2.5 V to +2.5 V and requires an external +2.5 V reference. It utilizes a high-speed two-wire serial interface for data output. Key electrical specifications include a typical power dissipation of 20 mW, a signal-to-noise ratio of 77 dB, and a differential nonlinearity of ±1.5 LSB. The component supports an operating temperature range from -40°C to +85°C.

Feature Summary

• Integrated on-chip track/hold amplifier ensures accurate signal acquisition without external components.
• High-speed serial interface allows easy connection to microprocessors using only two wires.
• Automatic power-down mode reduces energy consumption by entering standby after each conversion cycle.

Applications

• Battery-powered portable instrumentation systems
• Industrial process control data acquisition
• Medical equipment signal conditioning

Procurement Notes

Verify the specific suffix '3' corresponds to the required -2.5 V to +2.5 V input range before ordering. Confirm that the system design accommodates the 8-lead SOIC package dimensions and thermal requirements. Ensure the external reference voltage source meets the specified current and stability criteria for optimal performance.

Selection Notes

Select this model when a bipolar input range centered at ground is required within a compact footprint. Compare against the AD7894-10 for wider voltage ranges or the AD7894-2 for unipolar applications. Consider the pin-compatible AD7895 if 12-bit resolution is sufficient for lower cost requirements.

Part Context

This component belongs to the AD7894 family of 14-bit serial ADCs manufactured by Analog Devices. The family includes variants with different input ranges, such as the AD7894-10 for ±10 V inputs and the AD7894-2 for 0 V to +2.5 V inputs. All variants share the same 8-lead SOIC package and core architecture.

Replacement Considerations

The AD7895 is a pin-compatible upgrade offering 12-bit resolution. Verify functional equivalence regarding interface timing and power consumption when substituting.