AD7894ARZ-2REEL7

Overview

The AD7894ARZ-2REEL7 is a 14-bit successive approximation analog-to-digital converter (ADC) housed in an 8-lead SOIC package. 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 with a maximum input current of 500 nA. It delivers a typical signal-to-noise ratio of 77 dB and consumes 20 mW during operation. The part supports throughput rates up to 160 kHz and includes an automatic power-down mode for low-power applications.

Feature Summary

• Integrated on-chip track/hold amplifier ensures accurate conversion of full-scale sine waves at high sampling rates.
• High-speed two-wire serial interface allows easy connection to microprocessors using SCLK and SDATA lines.
• Automatic power-down mode reduces power consumption by entering sleep state after conversion completion.

Applications

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

Procurement Notes

Verify the specific suffix REEL7 indicates tape-and-reel packaging when sourcing components. Confirm that the AD7894-2 variant matches the required 0 V to +2.5 V unipolar input range for the application design. Ensure external reference voltage stability meets the specified minimum and maximum limits for optimal performance.

Selection Notes

Select this component when a 14-bit resolution and single-supply operation are required within a compact 8-lead package. Consider the AD7894-2 specifically for unipolar signals between 0 V and +2.5 V. Evaluate the need for the auto-sleep feature if battery life is critical, as it significantly reduces average power consumption compared to continuous operation modes.

Part Context

The AD7894 series serves as a pin-compatible upgrade to the 12-bit AD7895, offering higher resolution in the same footprint. The AD7894-2 variant is distinct from the bipolar AD7894-10 and AD7894-3 models due to its unipolar input architecture. This family provides a balance of speed, accuracy, and low power for general-purpose data acquisition tasks.

Replacement Considerations

The AD7894ARZ-2 is a direct pin-compatible replacement for the AD7895ARZ-2. Verify compatibility with existing PCB layouts designed for the 12-bit predecessor to ensure seamless integration without schematic modifications.