Analog Devices Inc. AD9218BST-RL80

Overview

AD9218BST-RL80 from Analog Devices is a dual 10-bit, 80 MSPS analog-to-digital converter (ADC) with on-chip track-and-hold and internal reference, designed for high-fidelity I/Q sampling in communications receivers and ultrasound front-ends. It delivers 57 dB SNR at 41 MHz input with 300 MHz analog bandwidth per channel, operates from a single 3.0 V supply (2.7–3.6 V), and supports 1 V_p-p or 2 V_p-p differential analog input ranges.

For engineers reviewing the AD9218BST-RL80 datasheet, AD9218BST-RL80 pinout, AD9218BST-RL80 application, or AD9218BST-RL80 equivalent, this page provides verified specifications, validated pin functions, confirmed dual-channel timing behavior, real-world I/Q demodulation use cases, and two manufacturer-validated alternative parts for migration or sourcing flexibility.

Technical Context

The AD9218BST-RL80 implements a bit-per-stage pipeline architecture with switch-capacitor techniques, delivering 7 MSBs per stage plus a 3-bit flash sub-ADC. Each channel features independent differential analog inputs with 300 MHz full-power bandwidth and self-biasing to V_D/3 common-mode voltage.

It uses TTL/CMOS-compatible encode inputs and latched digital outputs with five-cycle pipeline latency; output data alignment (via S1/S2) enables synchronized dual-channel capture when driven by phase-shifted clocks or skew compensation for same-clock operation.

Key Specifications

Pinout & Package

AD9218BST-RL80 is housed in a 48-lead LQFP package (7 mm × 7 mm, 0.5 mm pitch), rated for industrial temperature range (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel ADC applications.

Compared with AD9218BST-RL105, AD9218BST-RL80 reduces power by ~100 mW at 80 MSPS while maintaining identical interface and layout compatibility; versus AD9288BST-80, it adds 2 bits of resolution with only 25 mW extra dissipation, directly improving dynamic range in noise-limited receivers.

Availability

AD9218BST-RL80 is available at Aetrix Electronics and suitable for communications infrastructure, medical ultrasound imaging, and portable test instrumentation requiring stable component supply and long-term industrial-grade availability.

Supply support for AD9218BST-RL80 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.

The AD9218 product line targets high-speed data acquisition in communications, medical imaging, and instrumentation, emphasizing low power, on-chip integration, and pin-compatible scalability across speed grades.

FAQ

What is the maximum analog input frequency supported by AD9218BST-RL80?

The AD9218BST-RL80 has a full-power analog bandwidth of 300 MHz per channel, meaning it preserves signal amplitude within 3 dB up to 300 MHz. For Nyquist-limited sampling, its 80 MSPS encode rate supports reconstruction of signals up to 39 MHz. The device maintains 57 dB SNR at 41 MHz input, confirming usable performance beyond strict Nyquist, making it suitable for undersampled IF applications.

Does AD9218BST-RL80 require an external reference voltage?

No, AD9218BST-RL80 includes an internal 1.24 V reference (REFOUT) that can directly drive REFINA and REFINB pins for standard 1 V_p-p operation. External references are optional for custom full-scale ranges; the ADC's full-scale voltage tracks reference voltage linearly, with ±5% adjustment supported without performance loss.

How does the power-down mode function in AD9218BST-RL80?

In power-down mode (configured via S1/S2 pins), AD9218BST-RL80 reduces analog supply current to 20–22 mA per channel and drives all digital outputs to high-impedance state. Recovery requires exactly 10 clock cycles after exit command, ensuring predictable reactivation timing in burst-mode acquisition systems like ultrasound pulse-echo sequencing.

Can AD9218BST-RL80 be used with single-ended analog inputs?

Yes, AD9218BST-RL80 accepts single-ended inputs by grounding one side of each differential pair (e.g., tie AINA to GND, drive AINA), though dynamic performance degrades: SNR drops ~3–4 dB and SFDR decreases ~5 dB compared to differential drive. The input stage is internally biased to V_D/3, so single-ended signals must respect common-mode voltage limits to avoid clipping.

Is AD9218BST-RL80 pin-compatible with other members of the AD9218 family?

Yes, all AD9218BST-x variants-including AD9218BST-RL40, -RL65, -RL80, and -RL105-share identical 48-lead LQFP packaging, pinout, and footprint. This allows hardware reuse across speed grades; only the maximum encode rate and associated AC performance (e.g., SNR at Nyquist) differ between variants, with no PCB changes required for migration.