AD7887ARM

Overview

The AD7887ARM is a micropower, 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 configurable single- or dual-channel operation via an on-chip control register. In single-channel mode, the input range is 0 to VREF, while dual-channel mode utilizes 0 to VDD. The output coding is straight binary, and the component is housed in an 8-lead MSOP package.

Feature Summary

• Configurable single- or dual-channel operation via software control register
• Integrated 2.5 V reference with external overdrive capability
• Flexible power management including automatic shutdown after conversion
• SPI/QSPI/MICROWIRE/DSP compatible serial interface

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 'ARM' against the manufacturer's ordering guide to confirm the package type and temperature grade. Ensure the selected variant matches the required automotive qualification status if applicable. Cross-reference the pinout configuration for the 8-lead MSOP package to guarantee compatibility with the target PCB footprint and soldering profile requirements.

Selection Notes

Select this component when a small form factor 12-bit ADC with low power dissipation is required. Consider the internal reference stability and input voltage ranges relative to the system supply voltage. Evaluate the serial interface timing constraints against the host microprocessor capabilities. Verify that the 125 kSPS throughput rate meets the signal acquisition bandwidth requirements of the application.

Part Context

The AD7887 is part of Analog Devices' micropower ADC family designed for portable electronics. It integrates a successive approximation register architecture with a charge-redistribution DAC. The device is optimized for applications where space and power are critical constraints, offering a compact solution without compromising conversion accuracy or speed.

Replacement Considerations

Check for direct pin-compatible alternatives within the same product family. Verify that any substitute maintains the 12-bit resolution and 125 kSPS throughput rate. Ensure the replacement supports the same voltage range and serial interface protocols.