AD9218BSTZ-105

Overview

The AD9218BSTZ-105 is a dual-channel, 10-bit pipeline analog-to-digital converter manufactured by Analog Devices Inc. It supports a maximum sampling rate of 105 MSPS with a full-power analog bandwidth of 300 MHz per channel. The device operates on a single 3.0 V supply (range 2.7 V to 3.6 V) and dissipates 275 mW per channel at the maximum speed. It features an internal 1.24 V reference, TTL/CMOS compatible digital outputs, and configurable input ranges of 1 Vp-p or 2 Vp-p. The component is housed in a 48-lead LQFP package and is specified for industrial temperatures from -40°C to +85°C.

Feature Summary

• Dual-channel architecture with independent operation and low inter-channel crosstalk
• Integrated track-and-hold circuitry and voltage reference eliminating external components
• Configurable data formats including two's complement and offset binary
• User-selectable power-down modes and output data alignment capabilities

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 series includes multiple variants. Confirm that the application environment remains within the guaranteed industrial temperature range of -40°C to +85°C. Ensure proper ESD precautions are implemented during handling, as the device is sensitive to electrostatic discharge. Validate that the system clock jitter meets the aperture uncertainty specifications to maintain dynamic performance.

Selection Notes

Select this model when a high-speed, low-power dual ADC is required for direct IF sampling applications. The 105 MSPS grade provides sufficient bandwidth for Nyquist zone inputs up to approximately 51 MHz. Consider the pin compatibility with the 8-bit AD9288 if migrating existing designs to higher resolution without altering the PCB layout. Evaluate the power consumption against battery-operated constraints given the 275 mW per channel dissipation.

Part Context

This component belongs to the AD9218 family of dual 10-bit analog-to-digital converters offered by Analog Devices. The family encompasses various speed grades, including 40 MSPS, 65 MSPS, 80 MSPS, and 105 MSPS versions. All variants share the same 48-lead LQFP package and functional block diagram, differing primarily in their maximum sampling rates and associated AC performance metrics.

Replacement Considerations

The AD9218BSTZ-105 is pin-compatible with the 8-bit AD9288, allowing for direct upgrades in resolution without PCB redesign. No other direct cross-model replacements are documented in the provided datasheet.