AD9218BST-RL105

Overview

The AD9218BST-RL105 is a dual-channel, 10-bit analog-to-digital converter manufactured by Analog Devices Inc. It features a maximum sampling rate of 105 MSPS and operates on a single 3.0 V supply (range: 2.7 V to 3.6 V). Each channel provides a 300 MHz full-power analog bandwidth with an internal track-and-hold circuit. The device supports configurable differential input ranges of 1 Vp-p or 2 Vp-p and includes an on-chip voltage reference. Digital outputs are TTL/CMOS compatible and support offset binary or two's complement coding formats. It is housed in a 48-lead LQFP package rated for industrial temperatures from -40°C to +85°C.

Feature Summary

• Dual-channel architecture with independent operation capabilities
• Integrated track-and-hold circuits and internal voltage reference
• Configurable digital output data alignment and power-down modes
• Pin-compatible upgrade path from 8-bit devices

Applications

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

Procurement Notes

Verify the specific speed grade suffix matches the required sampling rate, as the AD9218 family includes multiple performance tiers. Confirm that the RL105 designation corresponds to the 105 MSPS variant within your distribution channel. Ensure the ordering information aligns with the latest manufacturer datasheet revision to avoid discrepancies in pinout or electrical specifications.

Selection Notes

Select this component when direct intermediate frequency sampling is required to simplify analog front-end designs. Consider the 105 MSPS grade only if room temperature no-missing-codes performance meets system requirements, as full-range guarantees apply to lower speed variants. Evaluate the 300 MHz analog bandwidth against the highest expected input signal frequency to ensure adequate dynamic range and signal fidelity.

Part Context

This part belongs to the AD9218 family of high-speed, low-power dual ADCs. It serves as a direct pin-compatible replacement for the 8-bit AD9288, facilitating system upgrades without PCB redesign. The device utilizes a proprietary pipeline architecture optimized for low power consumption while maintaining high dynamic performance across its operating range.

Replacement Considerations

The AD9218 is pin-compatible with the AD9288. Verify that the target application can accommodate the increased resolution and verify that the clocking and power supply requirements remain consistent with the legacy design constraints.