AD7887BR-REEL

Overview

The AD7887BR-REEL 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 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 input range is 0 to VREF, while dual-channel mode utilizes 0 to VDD. Key electrical specifications include a typical Signal-to-Noise Ratio (SNR) of 71 dB, full-power bandwidth of 2.5 MHz, and integral nonlinearity of ±1 LSB for the B version. Power consumption is typically 2.1 mW at 3 V and 3.5 mW at 5 V, with a shutdown current of 1 μA maximum.

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
• Compatible with SPI, QSPI, MICROWIRE, and DSP serial interfaces

Applications

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

Procurement Notes

Verify the specific suffix REEL indicates tape and reel packaging when sourcing components. Confirm that the B version meets the required linearity specifications compared to the A version. Ensure compatibility with the target system's voltage levels and serial interface protocols before integration.

Selection Notes

Select the AD7887BR-REEL for applications requiring high resolution with minimal power draw. The B version offers improved linearity over the A version. Consider the MSOP package size for space-constrained designs. Verify that the external reference requirements align with the internal 2.5 V reference capabilities if used in single-channel mode.

Part Context

This component belongs to the AD7887 series of micropower ADCs. It is designed for portable electronics where battery life and physical size are critical constraints. The device integrates a successive approximation architecture with a charge-redistribution DAC, providing a compact solution for signal digitization in embedded systems.

Replacement Considerations

Check for direct pin-compatible alternatives within the Analog Devices portfolio. Verify that any substitute maintains the 12-bit resolution and 125 kSPS throughput rate. Ensure the replacement supports the same 2.7 V to 5.25 V operating voltage range and serial interface compatibility.