AD7888ARU

Overview

The AD7888ARU is an 8-channel, 12-bit successive-approximation register (SAR) analog-to-digital converter (ADC) housed in a 16-lead TSSOP package. It operates on a single supply voltage ranging from 2.7 V to 5.25 V and supports throughput rates up to 125 kSPS with a 2 MHz serial clock. The device features eight single-ended analog inputs with a range of 0 V to VREF. Key electrical specifications include a typical signal-to-noise ratio (SNR) of 71 dB, integral nonlinearity (INL) of ±2 LSB, differential nonlinearity (DNL) of ±2 LSB, and gain error of ±2 LSB. Power consumption is typically 2 mW in normal operation and drops to 3 µW in shutdown mode.

Feature Summary

• Integrates an 8-channel multiplexer, track-and-hold circuit, and 12-bit SAR ADC within a compact 16-lead TSSOP package.
• Supports flexible power management modes including normal operation, full shutdown, autoshutdown, and autostandby for optimized energy efficiency.
• Features a versatile serial interface compatible with SPI, QSPI, Microwire, and DSP protocols.
• Includes an internal 2.5 V reference source that can be disabled to accommodate external reference voltages.

Applications

• Battery-powered systems such as personal digital assistants and mobile communications devices.
• Medical instruments requiring low power consumption and multi-channel data acquisition.
• Instrumentation and control systems needing precise analog signal monitoring.
• High-speed modems utilizing fast sampling rates.

Procurement Notes

Verify the specific suffix against official Analog Devices documentation to confirm package type and temperature grade. Ensure compatibility with system voltage levels and serial communication protocols before integration. Cross-reference pin configurations with the datasheet to prevent layout errors during PCB design.

Selection Notes

Select this component when designing systems requiring multiple single-ended analog inputs with moderate resolution and speed. Consider the trade-off between power consumption and throughput rate using the available power management bits. Ensure the analog input source impedance is low enough to maintain specified harmonic distortion performance.

Part Context

The AD7888 belongs to the AD7888 family of micropower, high-speed ADCs. It shares architectural similarities with other 12-bit SAR converters but distinguishes itself through its integrated 8-channel multiplexer and small form factor. The device is designed for applications where space constraints and battery life are critical design parameters.

Replacement Considerations

Direct replacements may include other 8-channel, 12-bit SAR ADCs from Analog Devices or competitors. Verify pinout compatibility, especially regarding the serial interface timing and control register structure. Check if alternative packages like SOIC are required for mechanical fit.