AD7866BRU

Overview

The AD7866BRU is a dual-channel, 12-bit successive approximation register (SAR) analog-to-digital converter manufactured by Analog Devices. It operates on a single supply voltage ranging from 2.7 V to 5.25 V and supports throughput rates up to 1 MSPS. The device integrates two independent ADCs, each preceded by a low-noise track-and-hold amplifier capable of handling input frequencies exceeding 10 MHz. Key electrical specifications include a maximum power dissipation of 24 mW at 5 V supplies and 11.4 mW at 3 V supplies. The component features an on-chip 2.5 V reference, flexible power management modes including shutdown, and compatibility with standard SPI/QSPI/Microwire interfaces.

Feature Summary

• Dual simultaneous conversion capability with independent track-and-hold amplifiers for each channel
• Integrated 2.5 V internal reference with options for external reference configuration
• Flexible power management allowing operation in normal, partial power-down, and full power-down modes
• Standard serial interface compatible with microprocessors and DSPs without pipeline delays

Applications

• Industrial process control systems requiring multi-channel data acquisition
• Battery-powered instrumentation benefiting from low power consumption
• Medical equipment utilizing high-speed signal digitization
• Remote data acquisition nodes operating in harsh environments

Procurement Notes

Verify the specific suffix 'RU' corresponds to the 20-lead TSSOP package when sourcing components. Confirm that the 'B' grade designation meets the required temperature range specifications for your application environment. Ensure that ordering documentation explicitly references the manufacturer's part number to avoid confusion with similar family members or alternative packaging options.

Selection Notes

Select this component when simultaneous sampling of two channels is required within a single package footprint. Consider the AD7866BRU for designs needing a 1 MSPS throughput rate with low power constraints. Evaluate the need for the integrated 2.5 V reference versus an external precision reference based on system accuracy requirements. Verify that the digital interface logic levels align with the host processor's voltage domain.

Part Context

The AD7866 belongs to Analog Devices' family of high-speed, low-power SAR ADCs. It is designed to bridge the gap between moderate resolution and high throughput in compact packages. The BRU variant specifically denotes the commercial/industrial temperature range version housed in a thin shrink small outline package, suitable for space-constrained PCB layouts.

Replacement Considerations

Direct pin-compatible replacements within the same series may include other temperature grades such as the AD7866ARU. Cross-family comparisons should focus on channel count, resolution, and interface compatibility rather than assuming functional equivalence across different ADC architectures.