AD7887AR

Overview

The AD7887AR 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 with a 2 MHz serial clock. The device features an internal track-and-hold amplifier that acquires signals in 500 ns and offers flexible configuration for either one or two single-ended analog inputs via the on-chip control register. It utilizes a successive approximation architecture and provides a straight binary output code compatible with SPI, QSPI, Microwire, and DSP interfaces. The component is housed in an 8-lead MSOP package.

Feature Summary

• Configurable single-channel or dual-channel operation using an on-chip control register
• Integrated 2.5 V reference with capability for external reference overdrive
• Flexible power management including automatic shutdown after conversion
• Read-only ADC capability when data input 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 'AR' against the manufacturer's current ordering guide to confirm the package type and temperature range specifications. Ensure compatibility with system voltage levels and interface requirements before integration. Cross-reference the datasheet revision E details for any updates to absolute maximum ratings or thermal impedance values relevant to the final design.

Selection Notes

Select this component for designs requiring a compact 12-bit resolution with minimal power dissipation. Evaluate the trade-off between the 125 kSPS throughput rate and the available serial clock frequencies. Consider the single-ended input architecture and verify that the 0 to VREF input range aligns with the sensor or signal source characteristics of the target application.

Part Context

The AD7887 belongs to the AD7887 series of micropower analog-to-digital converters. It is designed to provide high performance in a small footprint, making it suitable for portable electronics. The device integrates a SAR ADC core with a charge-redistribution DAC and is optimized for battery-operated environments where space and energy efficiency are critical constraints.

Replacement Considerations

Consult the manufacturer's official cross-reference documentation for verified substitute part numbers. Ensure that any replacement maintains the same pinout, resolution, and interface compatibility.