AD9218BST-RL80

Overview

The AD9218BST-RL80 is a dual-channel, 10-bit analog-to-digital converter manufactured by Analog Devices Inc. It operates at a maximum sampling rate of 80 MSPS with a single 3.0 V supply (range: 2.7 V to 3.6 V). The device features an on-chip track-and-hold circuit and voltage reference, supporting differential or single-ended inputs with selectable 1 V p-p or 2 V p-p ranges. It utilizes a parallel interface with TTL/CMOS compatible outputs and offers user-selectable power-down modes and data alignment options. Packaged in a 48-lead LQFP, it functions within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Dual-channel architecture with independent channel operation and low inter-channel crosstalk.
• Integrated track-and-hold and voltage reference eliminating external driver components.
• Flexible digital output formats including two's complement and offset binary.
• User-configurable power-down modes for individual channel energy management.

Applications

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

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm speed grade and package configuration. Ensure compatibility with system clocking requirements and logic voltage levels before integration. Confirm that the component meets all environmental and regulatory standards required for the intended deployment environment.

Selection Notes

Select this model when a dual-channel 10-bit resolution is required at speeds up to 80 MSPS. Consider the pin-compatible upgrade path from the 8-bit AD9288 if migrating existing designs. Evaluate the 300 MHz analog bandwidth and dynamic performance specifications against input signal frequencies to ensure adequate SNR and SFDR margins for the application.

Part Context

This component belongs to the AD9218 family of high-speed, low-power dual ADCs. It is designed as a drop-in replacement for the 8-bit AD9288, facilitating easy migration to higher resolution without altering the PCB layout. The device is fabricated on an advanced CMOS process to optimize power consumption while maintaining high ac performance across the industrial temperature range.

Replacement Considerations

The AD9218BST-RL80 is pin-compatible with the AD9288 series. Verify that the target system can support the increased resolution and check if the specific speed grade matches the design requirements.

FAQ

How does the DFS/GAIN pin affect the analog input range?

Setting the DFS/GAIN pin low enables offset binary output and supports a 1 V p-p input range. Setting it high enables two's complement output with a 1 V p-p range. Leaving it floating or connecting it to VREF enables two's complement output with a 2 V p-p range.

What is the pipeline delay for the digital outputs?

The AD9218 has a fixed pipeline delay of 5 cycles. Data outputs become valid one propagation delay after the rising edge of the encode command.

Can the internal voltage reference be bypassed?

Yes. While the internal reference is typically used by connecting REFINA and REFINB to REFOUT, external references can be applied to REFINA and REFINB to adjust the full-scale input range independently.