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Home > Products > Integrated Circuits (ICs) > Data Acquisition > Analog to Digital Converters (ADC)

Analog Devices Inc. AD9218BST-65

Name: AD9218BST-65
Brand: Analog Devices Inc.
SKU: AD9218BST-65
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD9218BST-65

Manufacturer:: Analog Devices Inc.

Category:: Analog to Digital Converters (ADC)

Package:: 48-LQFP

Datasheet:: AD9218BST-65.pdf

Description:: IC ADC 10BIT 65MSPS DUAL 48-LQFP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AD9218BST-65 from Analog Devices is a dual 10-bit, 65 MSPS analog-to-digital converter with on-chip track-and-hold and internal reference, operating from a single 3.0 V supply (2.7–3.6 V), delivering 57 dB SNR at 41 MHz input with 300 MHz analog bandwidth per channel, and supporting 1 V_p-p or 2 V_p-p differential analog input range for I/Q communications and ultrasound signal digitization.

For engineers reviewing the AD9218BST-65 datasheet, AD9218BST-65 pinout, AD9218BST-65 application, or AD9218BST-65 equivalent, key selection considerations include its dual-channel interleaving capability, –75 dBc inter-channel crosstalk, user-selectable twos complement/offset binary output format, power-down mode for single-channel operation, and compatibility with 8-bit AD9288 PCB layouts.

Technical Context

The AD9218BST-65 implements a bit-per-stage pipeline ADC architecture with switch-capacitor techniques, delivering 7 MSBs per stage plus a 3-bit flash sub-converter, and features fully differential analog inputs with internal common-mode bias at V_D/3. Each channel operates independently with five-cycle pipeline latency and TTL/CMOS-compatible encode and digital outputs.

It supports dual-clock or single-clock configurations via S1/S2 control pins, enabling data alignment (S1=1, S2=1) where Channel B output is delayed by ½ clock cycle to synchronize with Channel A's rising edge, and offers programmable gain mode and output format selection through the DFS/GAIN pin - floating for 2 V_p-p offset binary, high for 2 V_p-p twos complement, low for 1 V_p-p variants.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	10-bit - guarantees 1024 discrete amplitude levels per channel for precision waveform capture.
Sampling Rate	65 MSPS - enables Nyquist-limited digitization of signals up to 31 MHz without aliasing in standard mode.
SNR @ 41 MHz	57 dB - corresponds to ~9.2 effective bits (ENOB), sufficient for medium-fidelity RF and medical imaging front-ends.
Analog Bandwidth	300 MHz - supports wideband IF sampling in direct-conversion receivers without external anti-alias filtering below 300 MHz.
Crosstalk	–75 dBc - ensures minimal coupling between Channel A and B when one channel processes full-scale signal and the other handles low-level signal.
Power Dissipation	275 mW per channel at 105 MSPS - scales proportionally downward at 65 MSPS, enabling battery-powered portable instrumentation.
Input Range	2 V_p-p differential (confirmed for AD9218BST-65 grade) - doubles dynamic range vs. 1 V_p-p mode, improving SNR headroom for low-noise amplifiers.
Supply Voltage	2.7 V to 3.6 V (VD and VDD) - allows operation from standard 3.0 V Li-ion or regulated DC-DC rails without level-shifting.

Pinout & Package

AD9218BST-65 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).

Pin/Terminal	Circuit Role	Design Meaning
AINA / AINA	Differential analog input, Channel A	Accepts 2 V_p-p differential signal; internally biased to V_D/3; requires matched impedance for optimal SFDR.
AINB / AINB	Differential analog input, Channel B	Independent of Channel A; identical AC performance; enables simultaneous I/Q sampling without external multiplexing.
ENCA / ENCB	Encode clock inputs	TTL/CMOS-compatible; supports independent clocks (for phase-aligned data) or same clock (for synchronous sampling).
D0A–D9A / D0B–D9B	10-bit parallel digital outputs	MSB-first, TTL/CMOS logic; output voltage swing configurable via VDD (2.5–3.6 V); high-impedance in power-down mode.
DFS/GAIN	Data format & input gain select	Floating = 2 V_p-p offset binary; high = 2 V_p-p twos complement; low = 1 V_p-p offset binary - configures both range and coding.
S1 / S2	User-select control inputs	Set power-down (S1=S2=0), Channel B disable (S1=0,S2=1), or data alignment (S1=S2=1) - no external pull-ups required.
REFOUT	Internal 1.24 V reference output	Drives REFINA/REFINB directly; stable ±40 ppm/°C drift; supports ±5% adjustment for full-scale scaling.
VD / VDD	Analog / digital supply pins	Separate 3.0 V supplies reduce digital noise coupling into analog path; VDD powers outputs only - enables 2.5 V logic interfacing.

Key Features

Feature	Design Value
Dual independent 10-bit channels	Enables true simultaneous sampling for I/Q demodulation or time-interleaved acquisition without timing skew compensation.
On-chip 1.24 V reference with ±40 ppm/°C drift	Eliminates external reference IC and associated layout sensitivity, reducing BOM count and board area in portable designs.
2 V_p-p differential input range (65 MSPS grade)	Provides 6 dB higher input dynamic range than 1 V_p-p mode, improving SNR margin for ultrasound preamplifier interfaces.
–75 dBc channel crosstalk	Preserves signal integrity in dual-channel applications like phased-array ultrasound or dual-path RF receivers where isolation is critical.
Pin compatibility with AD9288	Allows drop-in upgrade from 8-bit to 10-bit resolution on existing PCBs - no layout revision needed for footprint and signal routing.
Programmable output data alignment	Supports synchronized readout of both channels on a single clock edge (via S1/S2), simplifying FPGA capture logic and memory addressing.

Applications

Ultrasound Beamforming	I/Q Demodulation in Cable Modems
Use Scenario: Digitizing echo return signals from multiple transducer elements in real time for digital beam steering and focusing. IC Role / Device Role / Timing Role: Dual-channel ADC capturing in-phase and quadrature baseband signals simultaneously with <3 ps aperture jitter to preserve phase coherence. Use Value: 300 MHz analog bandwidth supports wideband transducer harmonics; –75 dBc crosstalk prevents channel bleed during multi-element correlation processing.	Use Scenario: Downconverting and digitizing QAM-modulated IF signals (e.g., 36–42 MHz) in DOCSIS-compliant cable modems. IC Role / Device Role / Timing Role: Dual ADC performing parallel I and Q sampling at 65 MSPS to feed digital demodulator ASICs with phase-locked data streams. Use Value: 57 dB SNR at 41 MHz ensures >35 dB carrier-to-noise ratio for 256-QAM decoding; 2 V_p-p input accommodates variable-gain amplifier output swing.
Hand-Held Scopemeters	Battery-Powered Spectrum Analyzers
Use Scenario: Portable oscilloscope with dual-channel 100 MHz bandwidth front-end using direct IF sampling architecture. IC Role / Device Role / Timing Role: ADC providing 65 MSPS dual-channel capture with 5-cycle pipeline delay, enabling real-time FFT and trigger processing in low-power ARM-based systems. Use Value: 275 mW/channel power dissipation extends battery life; on-chip reference eliminates calibration drift across temperature in field-deployed units.	Use Scenario: Compact RF spectrum analyzer measuring 1–100 MHz signals with real-time bandwidth >10 MHz using overlapping FFT windows. IC Role / Device Role / Timing Role: Dual ADC feeding FPGA-based spectral engine with synchronized I/Q samples for complex FFT computation and display rendering. Use Value: Pin compatibility with AD9288 allows reuse of proven layout; 300 MHz analog bandwidth enables harmonic analysis up to 3rd order without aliasing.

Ultrasound Beamforming

I/Q Demodulation in Cable Modems

Use Scenario: Digitizing echo return signals from multiple transducer elements in real time for digital beam steering and focusing.

IC Role / Device Role / Timing Role: Dual-channel ADC capturing in-phase and quadrature baseband signals simultaneously with <3 ps aperture jitter to preserve phase coherence.

Use Value: 300 MHz analog bandwidth supports wideband transducer harmonics; –75 dBc crosstalk prevents channel bleed during multi-element correlation processing.

Use Scenario: Downconverting and digitizing QAM-modulated IF signals (e.g., 36–42 MHz) in DOCSIS-compliant cable modems.

IC Role / Device Role / Timing Role: Dual ADC performing parallel I and Q sampling at 65 MSPS to feed digital demodulator ASICs with phase-locked data streams.

Use Value: 57 dB SNR at 41 MHz ensures >35 dB carrier-to-noise ratio for 256-QAM decoding; 2 V_p-p input accommodates variable-gain amplifier output swing.

Hand-Held Scopemeters

Battery-Powered Spectrum Analyzers

Use Scenario: Portable oscilloscope with dual-channel 100 MHz bandwidth front-end using direct IF sampling architecture.

IC Role / Device Role / Timing Role: ADC providing 65 MSPS dual-channel capture with 5-cycle pipeline delay, enabling real-time FFT and trigger processing in low-power ARM-based systems.

Use Value: 275 mW/channel power dissipation extends battery life; on-chip reference eliminates calibration drift across temperature in field-deployed units.

Use Scenario: Compact RF spectrum analyzer measuring 1–100 MHz signals with real-time bandwidth >10 MHz using overlapping FFT windows.

IC Role / Device Role / Timing Role: Dual ADC feeding FPGA-based spectral engine with synchronized I/Q samples for complex FFT computation and display rendering.

Use Value: Pin compatibility with AD9288 allows reuse of proven layout; 300 MHz analog bandwidth enables harmonic analysis up to 3rd order without aliasing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD9218BST-80	Higher 80 MSPS sampling rate; tested in 1 V_p-p range; SNR = 55 dB @ Nyquist (39 MHz)	Better suited for wider IF bandwidths (>35 MHz) but trades 2 dB SNR vs. AD9218BST-65's 2 V_p-p mode at lower frequencies	Select AD9218BST-80 when system requires >65 MSPS throughput and can accept reduced dynamic range at mid-band.
AD9288BST-65	8-bit resolution; identical 48-lead LQFP package and pinout; 65 MSPS; 50 dB SNR @ 41 MHz	Limited to lower-fidelity applications (e.g., basic waveform logging) where 10-bit ENOB is not required	Choose AD9218BST-65 over AD9288BST-65 when ≥9-bit ENOB is mandatory for signal fidelity in medical or comms systems.

Compared with AD9218BST-80 and AD9288BST-65, the AD9218BST-65 uniquely balances 10-bit resolution, 2 V_p-p input range, and –75 dBc crosstalk - making it optimal for ultrasound and I/Q systems requiring high SNR below 35 MHz without sacrificing layout compatibility.

Availability

AD9218BST-65 is available at Aetrix Electronics and suitable for ultrasound equipment, hand-held scopemeters, and low-cost digital oscilloscopes requiring stable component supply, long-term obsolescence management, and traceable sourcing for medical and test & measurement OEMs.

Supply support for AD9218BST-65 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, founded in 1965 and headquartered in Wilmington, MA.

The AD9218 product line delivers dual-channel, low-power, high-speed ADCs optimized for portable instrumentation, communications infrastructure, and medical imaging - emphasizing pin compatibility, integrated references, and industrial temperature reliability.

FAQ

What is the confirmed analog input range for AD9218BST-65?

The AD9218BST-65 is specified for 2 V_p-p differential analog input range, as explicitly stated in Table 3 footnote 1 and Figure 16 of the Rev. D datasheet. This differs from the 40/80/105 MSPS grades, which use 1 V_p-p. The 2 V_p-p mode is enabled when the DFS/GAIN pin is left floating, and provides improved SNR headroom for low-noise amplifier interfaces in ultrasound and test equipment applications. AD9218BST-65 maintains this range across its full industrial temperature range.

Does AD9218BST-65 support independent clocking for each channel?

Yes, AD9218BST-65 supports independent encode clocks via dedicated ENCA and ENCB inputs. When two phase-coherent clocks are applied (e.g., 180° out-of-phase), the S1/S2 control pins can enable data alignment mode (S1=1, S2=1), causing Channel B's output to be delayed by ½ clock cycle so both channels' data appear aligned on the rising edge of Clock A. This capability is confirmed in Table 7 and Figure 4 of the datasheet and is essential for synchronized I/Q sampling in software-defined radio and phased-array systems using AD9218BST-65.

How does the power-down mode function in AD9218BST-65?

AD9218BST-65 offers three power-down states controlled by S1 and S2 pins: both channels disabled (S1=S2=0), Channel B only disabled (S1=0, S2=1), or normal operation (S1=1, S2=0). In power-down, digital outputs enter high-impedance state, and supply current drops to 20–22 mA (IVD) while IVDD falls to ±10 µA typical. Recovery requires exactly 10 clock cycles, as verified in Table 4 and Table 7 of the Rev. D datasheet. This feature enables dynamic power scaling in battery-powered scopemeters and portable ultrasound devices using AD9218BST-65.

Is AD9218BST-65 pin-compatible with AD9288, and what does that mean for PCB design?

Yes, AD9218BST-65 is pin-compatible with the 8-bit AD9288 dual ADC, sharing identical 48-lead LQFP footprint, pin numbering, and signal assignments (e.g., AINA/AINA, ENCA/ENCB, D0A–D9A, etc.). This allows direct replacement on existing PCBs without layout changes - only firmware and driver updates are needed to exploit the extra 2 bits of resolution and improved SNR. The compatibility is explicitly highlighted in the Product Highlights section and Figure 5 pin diagram of the AD9218 datasheet, confirming mechanical and electrical interoperability for AD9218BST-65 migration paths.

What is the aperture jitter specification for AD9218BST-65, and why does it matter?

AD9218BST-65 has an aperture uncertainty (jitter) of 3 ps rms, as specified in Table 4 under "Aperture Uncertainty (Jitter)" for all speed grades including the 65 MSPS variant. This low jitter directly limits SNR at high input frequencies: for a 41 MHz sine wave, 3 ps jitter contributes ~0.5 dB SNR degradation, enabling the measured 57 dB SNR. It is critical for preserving phase coherence in I/Q demodulation and beamforming applications where AD9218BST-65 is deployed - jitter below 5 ps ensures minimal EVM impact in QAM systems and accurate time-of-flight calculation in ultrasound.

AD9218BST-65 Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 48-LQFP

Packaging:: Bag

Product Status:: Obsolete

Number of Bits:: 10

Sampling Rate (Per Second):: 65M

Number of Inputs:: -

Input Type:: -

Data Interface:: Parallel

Configuration:: -

Ratio - S/H:ADC:: -

Number of A/D Converters:: 2

Architecture:: -

Reference Type:: -

Voltage - Supply, Analog:: -

Voltage - Supply, Digital:: -

Features:: -

Operating Temperature:: -40°C ~ 85°C

Supplier Device Package:: 48-LQFP (7x7)

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

AD9218BST-65 FAQ

1.How can I place an order for AD9218BST-65 through Aetrix?

Please submit a Request for Quotation (RFQ) for AD9218BST-65 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AD9218BST-65 reliable?

The price and inventory of AD9218BST-65 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD9218BST-65 is usually 5 days.

3.What payment methods are accepted for AD9218BST-65?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD9218BST-65 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD9218BST-65?

AD9218BST-65 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD9218BST-65 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AD9218BST-65?

For technical support, including AD9218BST-65 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD9218BST-65 requirements.

6.How does Aetrix verify that AD9218BST-65 is sourced from the original manufacturer or authorized distributors?

All AD9218BST-65 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD9218BST-65 meets industry standards.

7.What is the process for return or replacement of AD9218BST-65?

All AD9218BST-65 units undergo pre-shipment inspection (PSI). If there is an issue with AD9218BST-65, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AD9218BST-65 part is unused and in its original packaging.

Return procedure for AD9218BST-65:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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