AD7887BR

Overview

The AD7887BR is a micropower, 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 supply and supports throughput rates up to 125 kSPS with a 2 MHz serial clock. The device features two single-ended analog inputs configurable via an on-chip control register for either single-channel or dual-channel operation. In single-channel mode, the AIN1/VREF pin functions as a reference input/output, supporting an external reference range of 1.2 V to VDD or accessing the internal 2.5 V reference. In dual-channel mode, this pin serves as the second analog input, with the reference internally tied to VDD. The ADC utilizes a charge-redistribution DAC architecture and outputs straight binary data compatible with SPI, QSPI, Microwire, and DSP interfaces.

Feature Summary

• Configurable single- or dual-channel operation via software control register
• Integrated track-and-hold amplifier with 500 ns acquisition time
• Flexible power management including automatic shutdown after conversion
• Read-only ADC capability when DIN line is tied to ground

Applications

• Battery-powered systems such as personal digital assistants and medical instruments
• Instrumentation and control systems requiring low power consumption
• High-speed modem applications

Procurement Notes

Verify the specific suffix 'BR' against the manufacturer's current ordering guide to confirm package type and temperature grade. Ensure the selected variant matches the required automotive qualification status if applicable. Cross-reference the datasheet revision E specifications with the component marking to guarantee functional compatibility with system design requirements.

Selection Notes

Select the AD7887BR for applications demanding low power dissipation in a compact 8-lead MSOP or SOIC package. Consider the internal 2.5 V reference for simplified designs or use an external reference for higher precision. Evaluate the power-down modes to optimize energy consumption based on the required sampling rate and system idle times.

Part Context

The AD7887 series represents a family of high-speed, low-power 12-bit ADCs designed for portable and battery-operated electronics. The BR designation typically indicates a specific package configuration and temperature range within the broader AD7887 product line, which also includes variants like the AD7887AR. This component is part of Analog Devices' portfolio focused on micropower signal chain solutions.

Replacement Considerations

The AD7887AR is listed as a parameter-equivalent substitute. Verify that the alternative part number matches the required package style and operating temperature range before implementation.