AD9218BST-80

Overview

The AD9218BST-80 is a dual 10-bit monolithic sampling analog-to-digital converter manufactured by Analog Devices Inc. It supports a maximum sampling rate of 80 MSPS per channel with an analog bandwidth of 300 MHz. The device operates on a single 3.0 V supply (range 2.7 V to 3.6 V) and dissipates approximately 515 mW to 550 mW of power. Key performance metrics include a Signal-to-Noise Ratio (SNR) of 57 dB at Nyquist frequency and a Spurious-Free Dynamic Range (SFDR) of -63 dBc. It features an internal voltage reference, differential or single-ended input options, and TTL/CMOS compatible digital outputs in a 48-lead LQFP package.

Feature Summary

• Dual-channel architecture with independent operation capabilities
• Integrated track-and-hold circuit and internal voltage reference
• User-selectable data formats including two's complement and offset binary
• Low crosstalk between channels for improved signal integrity

Applications

• I and Q communications systems
• Battery-powered instruments
• Hand-held scopemeters
• Low cost digital oscilloscopes
• Ultrasound equipment

Procurement Notes

Verify the specific speed grade suffix matches the required sampling rate, as the AD9218 series includes 40, 65, 80, and 105 MSPS variants. Confirm that the 48-lead LQFP package is suitable for the target PCB layout. Ensure the design accounts for the industrial temperature range specifications (-40°C to +85°C) and the single 3.0 V power supply requirement for both analog and digital sections.

Selection Notes

Select the AD9218BST-80 when an 80 MSPS sampling rate is sufficient for the application, offering lower power consumption compared to the 105 MSPS variant. Consider the pin-compatible upgrade path from the 8-bit AD9288 if migrating existing designs. Evaluate the need for external drivers based on the 300 MHz analog bandwidth and the ability to accept differential or single-ended inputs directly.

Part Context

The AD9218 is part of Analog Devices' family of low-cost, low-power dual ADCs designed for portable and battery-operated applications. It utilizes a pipeline architecture fabricated on an advanced CMOS process. The device is optimized for direct IF sampling, reducing the need for complex analog mixer and filter stages in receiver architectures.

Replacement Considerations

The AD9218 is pin-compatible with the 8-bit AD9288, allowing for easy migration from lower resolution devices. No other direct functional substitutes are documented in the provided datasheet.