AD7888BRZ

Overview

The AD7888BRZ is a high-speed, low-power 12-bit 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 throughput rates up to 125 kSPS. The device features eight single-ended analog inputs multiplexed into an on-chip track-and-hold circuit with a 500 ns acquisition time. It utilizes a successive-approximation register (SAR) architecture and includes an internal 2.5 V reference or accepts external references between 1.2 V and VDD. The serial interface is compatible with SPI, QSPI, MICROWIRE, and DSP standards. Power consumption is typically 2 mW in normal operation and drops to 3 µW in shutdown mode.

Feature Summary

• Eight single-ended analog input channels with integrated multiplexer and track-and-hold circuitry
• Flexible power management options including automatic shutdown after conversion and standby modes
• Versatile serial I/O port compatible with multiple industry-standard communication protocols
• On-chip 2.5 V voltage reference with option for external reference input

Applications

• Battery-powered systems such as personal digital assistants and mobile communications devices
• Medical instruments requiring low power consumption and high precision
• Instrumentation and control systems
• High-speed modems

Procurement Notes

Verify the specific grade version (A or B) required for your application, as both share the same package but may have different linearity specifications. Confirm that the 16-lead TSSOP or SOIC package aligns with your PCB footprint. Ensure the operating temperature range meets your environmental requirements, as the device is specified for -40°C to +105°C. Check for any specific ordering suffixes that might indicate tape-and-reel packaging versus tube packaging if applicable to your assembly process.

Selection Notes

Select the AD7888BRZ when an 8-channel multiplexed ADC with 12-bit resolution is needed in a compact form factor. It is suitable for applications where power efficiency is critical, offering automatic power-down capabilities. Consider this component if your system requires compatibility with standard serial interfaces like SPI or MICROWIRE. Evaluate the input voltage range and reference requirements to ensure they match your signal sources and available reference voltages.

Part Context

The AD7888 is part of Analog Devices' family of micropower, high-speed ADCs designed for battery-operated equipment. It integrates an 8-channel multiplexer, track-and-hold, SAR ADC, and reference into a single chip. The BRZ suffix indicates a lead-free RoHS-compliant variant in a 16-lead TSSOP or SOIC package. It competes with other low-power, multi-channel ADCs in the industrial and consumer electronics markets.

Replacement Considerations

Direct pin-compatible replacements within the same family include the AD7888ARZ and AD7888ARUZ. Verify that substitute parts maintain the same 12-bit resolution, 125 kSPS speed, and 8-channel configuration. Ensure that the thermal performance and package dimensions are identical to avoid PCB redesign.