AD7888ARZ

Overview

The AD7888ARZ is a high-speed, low-power 12-bit successive-approximation analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates from a single 2.7 V to 5.25 V power supply and supports a throughput rate of 125 kSPS with a 2 MHz serial clock. The device features eight single-ended analog inputs multiplexed into an on-chip track-and-hold circuit that acquires signals in 500 ns. It includes an internal 2.5 V reference or accepts external references between 1.2 V and VDD. The ADC utilizes a flexible serial interface compatible with SPI, QSPI, Microwire, and DSP standards. Normal mode power dissipation is typically 2 mW, while shutdown mode consumes as little as 3 µW.

Feature Summary

• Eight single-ended analog input channels multiplexed into a charge redistribution SAR architecture
• Flexible power management options including automatic shutdown after conversion and standby modes
• On-chip 2.5 V reference voltage source accessible via the REFIN/REFOUT pin for external buffering or overdrive
• Serial data interface compatible with standard communication protocols for microcontroller integration

Applications

• Battery-powered systems such as personal digital assistants and mobile communications devices
• Medical instruments requiring precise signal acquisition
• Instrumentation and control systems monitoring multiple sensor channels
• High-speed modem applications

Procurement Notes

Verify the package type matches the specific suffix requirements, as the AD7888 series includes both SOIC and TSSOP variants. Confirm the temperature grade corresponds to the intended operating environment. Ensure the ordering information aligns with the manufacturer's current revision status. Check for any specific handling precautions related to electrostatic discharge sensitivity during assembly.

Selection Notes

Select this component when a compact solution for multi-channel signal acquisition is required. The 16-lead TSSOP package offers significant space savings compared to alternative packages. Consider the power consumption profiles if battery life is a critical design constraint. Verify that the serial interface timing meets the system clock requirements for the desired throughput rate.

Part Context

The AD7888 belongs to the Analog Devices AD7888 family of micropower ADCs. It is designed to provide high performance in a small footprint, making it suitable for portable electronics. The device integrates the multiplexer, track-and-hold, and reference, reducing the need for external components. It is part of the broader portfolio of data converters offered by Analog Devices for industrial and consumer applications.

Replacement Considerations

Check for direct pin-compatible replacements within the same product family. Verify that substitute parts meet the required resolution, sampling rate, and power specifications. Ensure the serial interface compatibility remains consistent to avoid redesigning the communication logic.