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

Analog Devices Inc. AD9281ARSZRL

Name: AD9281ARSZRL
Brand: Analog Devices Inc.
SKU: AD9281ARSZRL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD9281ARSZRL

Manufacturer:: Analog Devices Inc.

Category:: Analog to Digital Converters (ADC)

Package:: 28-SSOP (0.209", 5.30mm Width)

Datasheet:: AD9281ARSZRL.pdf

Description:: IC ADC 8BIT PIPELINED 28SSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AD9281ARSZRL from Analog Devices is a dual-channel, 8-bit, 28 MSPS CMOS analog-to-digital converter optimized for I/Q signal acquisition in communications systems. It integrates two matched ADC cores, on-chip analog input buffers, a programmable 1 V/2 V bandgap reference, and a multiplexed 8-bit digital output bus. Its differential nonlinearity of ±0.1 LSB, SNR of 49.2 dB at 3.58 MHz, and spurious-free dynamic range of –65 dB support high-fidelity baseband digitization in QAM demodulators and IF sampling receivers.

For engineers reviewing the AD9281ARSZRL datasheet, AD9281ARSZRL pinout, AD9281ARSZRL application, or AD9281ARSZRL equivalent, key selection criteria include channel matching (±0.2 LSB gain match, ±1.2 LSB offset match), single-supply operation (2.7 V to 5.5 V), low power consumption (225 mW at 3 V), SSOP-28 package compatibility, and support for both differential and single-ended analog inputs up to 14 MHz Nyquist frequency.

Technical Context

The AD9281ARSZRL employs a multistage pipeline architecture with simultaneous sampling sample-and-hold amplifiers per channel, delivering guaranteed no-missing-codes performance and 3-cycle pipeline latency. Its dual-core design shares a single on-chip reference buffer to maximize inter-channel gain match and minimize crosstalk (–62 dB).

Analog input structure uses PMOS source-followers to achieve high input impedance and accept signals down to –0.5 V, while supporting full-scale spans of 1 V or 2 V via REFSENSE pin strapping. Digital outputs are time-multiplexed onto one 8-bit bus controlled by the SELECT pin, reducing interface complexity versus discrete dual-ADC solutions.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	8-bit - Enables cost-effective digitization of baseband and IF signals with sufficient dynamic range for QAM-16/64 demodulation.
Sampling Rate	28 MSPS (32 MSPS at +25°C) - Supports Nyquist bandwidth up to 14 MHz, covering narrowband and spread-spectrum channels.
Differential Nonlinearity	±0.1 LSB - Ensures monotonic transfer function critical for accurate phase-sensitive I/Q decoding.
Signal-to-Noise Ratio	49.2 dB at 3.58 MHz - Delivers >7 effective bits, meeting minimum ENOB requirements for 16-QAM symbol recovery.
Spurious-Free Dynamic Range	–65 dB - Suppresses harmonics and intermodulation products that degrade constellation fidelity in dense modulation schemes.
Power Consumption	225 mW at 3 V supply - Enables integration into power-constrained portable and battery-backed communication front-ends.
Input Voltage Range	–0.5 V to AVDD/2 - Allows dc-coupled or ac-coupled inputs with ground-referenced or transformer-driven biasing.

Pinout & Package

AD9281ARSZRL is housed in a 28-lead SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, optimized for compact PCB layouts in RF front-end modules and software-defined radio platforms.

Pin/Terminal	Circuit Role	Design Meaning
DVSS	Digital Ground	Reference return for digital logic; must be isolated from analog ground (AVSS) except at single-point star connection.
DVDD	Digital Supply	Independent 2.7–5.5 V rail for output drivers; enables interfacing with 3.3 V or 5 V logic families.
D0–D7	Multiplexed Data Outputs	Time-shared 8-bit bus carrying either I or Q channel data based on SELECT pin state; reduces FPGA/GPIO pin count.
SELECT	Channel Multiplexer Control	High = I-channel output enabled; Low = Q-channel output enabled; supports interleaved readout without external logic.
CLOCK	Sampling Clock Input	Accepts CMOS-level clock; rising edge triggers simultaneous sampling on both I and Q inputs with 4 ns aperture delay.
SLEEP	Power-Down Control	High = standby mode (16 mW); Low = active conversion; enables rapid wake-up for burst-mode receivers.
INA-I / INB-I	I-Channel Differential Inputs	High-impedance buffered inputs accepting ±0.5 V to ±1.0 V differential swing; eliminates need for external op-amp buffers in most designs.
INA-Q / INB-Q	Q-Channel Differential Inputs	Matched to I-channel inputs for <2 ps aperture delay skew, preserving I/Q orthogonality in phase-sensitive applications.
VREF	Internal Reference Output	Programmable 1 V or 2 V output; sets full-scale range and determines input span (e.g., 0–1 V or –0.5 V to +1.5 V).
REFSENSE	Reference Mode Select	Strapped to VREF = 1 V mode; to GND = 2 V mode; to AVDD = external reference mode; configures reference topology without external components.
CHIP-SELECT	Output Enable	Low = three-state outputs active; High = outputs tri-stated; allows multiple AD9281ARSZRL devices on shared data bus.
AVDD / AVSS	Analog Supply / Ground	Separate 2.7–5.5 V analog rail decoupled with 0.1 µF + 10 µF capacitors; minimizes digital noise coupling into conversion path.

Key Features

Feature	Design Value
Dual matched ADC cores	Guaranteed ±0.2 LSB gain match and ±1.2 LSB offset match between I and Q channels ensures minimal image rejection degradation in quadrature receivers.
On-chip analog input buffers	Eliminates requirement for external op-amps in >90% of applications, reducing BOM cost and board area while maintaining 240 MHz small-signal bandwidth.
Pin-programmable reference	Single-pin (REFSENSE) selection between 1 V and 2 V internal reference modes enables optimization for distortion (1 V @ 3 V AVDD) or SNR (2 V @ 5 V AVDD).
Single 8-bit multiplexed output bus	Reduces digital interface footprint by 50% vs. dual independent buses, simplifying FPGA resource allocation and PCB routing in space-constrained SDR platforms.
Low-power standby mode	16 mW power-down state with fast wake-up (<100 ns) supports duty-cycled operation in battery-powered spectrum analyzers and IoT gateways.

Applications

QAM Demodulation Receiver	IF Sampling in Cellular Base Stations
Use Scenario: Digitizing I/Q baseband outputs from quadrature downconverters in cable modems and Wi-Fi access points. IC Role / Device Role / Timing Role: Dual-channel ADC synchronously sampling I and Q paths at 28 MSPS to preserve phase coherence for 64-QAM symbol recovery. Use Value: ±0.1 LSB DNL and –65 dB SFDR maintain EVM <3% under multi-tone interference, enabling compliance with DOCSIS 3.1 spectral mask requirements.	Use Scenario: Direct IF sampling of 70 MHz or 140 MHz intermediate frequencies in LTE femtocells and small-cell radios. IC Role / Device Role / Timing Role: Simultaneous sampling ADC capturing complex IF signals with 14 MHz Nyquist bandwidth and 3-cycle deterministic latency for real-time DSP alignment. Use Value: On-chip 2 V reference and 49.2 dB SNR enable >7.5 ENOB at 14 MHz, supporting 20 MHz LTE channel bandwidth with adequate noise margin.
Software-Defined Radio Front-End	Test & Measurement Signal Analyzer
Use Scenario: Reconfigurable wideband receiver front-end in military comms and spectrum monitoring equipment. IC Role / Device Role / Timing Role: Dual ADC providing flexible I/Q digitization across HF/VHF/UHF bands using programmable input span and external clock synchronization. Use Value: SSOP-28 package and 2.7–5.5 V supply range allow integration into modular, field-upgradable hardware with mixed-voltage backplanes.	Use Scenario: Embedded digitizer in benchtop oscilloscopes and vector signal analyzers requiring calibrated dual-channel acquisition. IC Role / Device Role / Timing Role: Precision-matched ADC pair capturing correlated waveforms for phase difference measurement and jitter analysis. Use Value: <2 ps aperture delay match and –62 dB crosstalk ensure sub-degree phase error accuracy essential for time-domain reflectometry and eye diagram analysis.

QAM Demodulation Receiver

IF Sampling in Cellular Base Stations

Use Scenario: Digitizing I/Q baseband outputs from quadrature downconverters in cable modems and Wi-Fi access points.

IC Role / Device Role / Timing Role: Dual-channel ADC synchronously sampling I and Q paths at 28 MSPS to preserve phase coherence for 64-QAM symbol recovery.

Use Value: ±0.1 LSB DNL and –65 dB SFDR maintain EVM <3% under multi-tone interference, enabling compliance with DOCSIS 3.1 spectral mask requirements.

Use Scenario: Direct IF sampling of 70 MHz or 140 MHz intermediate frequencies in LTE femtocells and small-cell radios.

IC Role / Device Role / Timing Role: Simultaneous sampling ADC capturing complex IF signals with 14 MHz Nyquist bandwidth and 3-cycle deterministic latency for real-time DSP alignment.

Use Value: On-chip 2 V reference and 49.2 dB SNR enable >7.5 ENOB at 14 MHz, supporting 20 MHz LTE channel bandwidth with adequate noise margin.

Software-Defined Radio Front-End

Test & Measurement Signal Analyzer

Use Scenario: Reconfigurable wideband receiver front-end in military comms and spectrum monitoring equipment.

IC Role / Device Role / Timing Role: Dual ADC providing flexible I/Q digitization across HF/VHF/UHF bands using programmable input span and external clock synchronization.

Use Value: SSOP-28 package and 2.7–5.5 V supply range allow integration into modular, field-upgradable hardware with mixed-voltage backplanes.

Use Scenario: Embedded digitizer in benchtop oscilloscopes and vector signal analyzers requiring calibrated dual-channel acquisition.

IC Role / Device Role / Timing Role: Precision-matched ADC pair capturing correlated waveforms for phase difference measurement and jitter analysis.

Use Value: <2 ps aperture delay match and –62 dB crosstalk ensure sub-degree phase error accuracy essential for time-domain reflectometry and eye diagram analysis.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD9201ARSZ	10-bit resolution, same 28-lead SSOP pinout, higher power (350 mW), lower SFDR (–70 dB)	Better resolution for wide-dynamic-range IF sampling but higher power and cost; not drop-in due to different reference pin behavior	Select AD9201ARSZ when ENOB > 8.5 is required and power budget allows +125 mW overhead.
ADS5272IPFP	8-bit, 40 MSPS, quad-channel, QFN-64 package, separate I/Q buses, no integrated reference	Higher throughput and channel count for MIMO systems but requires external reference and increases layout complexity	Choose ADS5272IPFP for multi-antenna baseband processing where parallel I/Q streams outweigh board-area penalties.

Compared with AD9281ARSZRL, AD9201ARSZ offers higher resolution at the expense of power and cost, while ADS5272IPFP provides greater channel density and speed but demands additional support circuitry and larger PCB footprint-making AD9281ARSZRL optimal for cost-sensitive, space-constrained dual-channel I/Q digitization.

Availability

AD9281ARSZRL is available at Aetrix Electronics and suitable for QAM demodulation receivers, IF sampling in cellular base stations, software-defined radio front-ends, test & measurement signal analyzers, and spectrum monitoring systems requiring stable component supply across extended production lifecycles.

Supply support for AD9281ARSZRL 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 Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.

The AD9281ARSZRL belongs to Analog Devices' precision data converter product line, engineered specifically for communications infrastructure applications demanding tight channel matching, low power, and robust I/Q signal integrity in wireless and broadband systems.

FAQ

What is the maximum analog input frequency supported by the AD9281ARSZRL?

The AD9281ARSZRL supports analog input frequencies up to 14 MHz Nyquist (full-power bandwidth of 245 MHz at –3 dB), verified by its 240 MHz small-signal bandwidth specification. This enables direct sampling of IF signals in GSM, CDMA, and early LTE bands without external antialias filtering beyond basic passive networks. The device maintains 49.2 dB SNR at 3.58 MHz and 48.5 dB at 14 MHz, confirming usable performance across its entire input range. Designers should verify layout decoupling and common-mode voltage per Figure 27 to sustain THD < –60 dB.

How does the REFSENSE pin configure the internal reference voltage on the AD9281ARSZRL?

The REFSENSE pin on the AD9281ARSZRL selects reference mode via pin strapping: tied to VREF selects 1 V mode (0–1 V input span); tied to AVSS selects 2 V mode (–0.5 V to +1.5 V span); tied to AVDD disables the internal reference for external reference use. This configuration is latched at power-up and requires no software control. The 1 V mode optimizes high-frequency distortion on 3 V supplies, while 2 V mode improves SNR on 5 V supplies-both validated in the AD9281ARSZRL datasheet Table I and Figures 22–25.

Can the AD9281ARSZRL operate with separate analog and digital supply voltages?

Yes, the AD9281ARSZRL supports independent analog (AVDD/AVSS) and digital (DVDD/DVSS) supplies ranging from 2.7 V to 5.5 V each. This separation allows optimization-for example, AVDD = 5 V for improved SNR and DVDD = 3.3 V for FPGA compatibility. The absolute maximum ratings specify AVDD–DVDD ≤ ±6.5 V and AVSS–DVSS ≤ ±0.3 V, mandating careful ground partitioning. Decoupling per Figure 21 (0.1 µF + 10 µF per supply) is required to prevent digital switching noise from degrading analog performance.

What is the purpose of the SELECT and CHIP-SELECT pins on the AD9281ARSZRL?

The SELECT pin controls time-multiplexed output routing: HIGH enables I-channel data on D0–D7, LOW enables Q-channel data. The CHIP-SELECT pin places all digital outputs (D0–D7) into high-impedance state when HIGH, allowing multiple AD9281ARSZRL devices to share a common data bus. Both pins are referenced to AVDD/AVSS and have CMOS-compatible thresholds (AVDD/2). Their combined use enables flexible readout architectures-e.g., interleaved I/Q capture with external buffering or daisy-chained configurations in multi-channel systems.

Does the AD9281ARSZRL require external input amplifiers for driving its analog inputs?

No, the AD9281ARSZRL integrates high-input-impedance PMOS source-follower buffers on both I and Q channels, eliminating the need for external op-amps in most applications. These buffers accept single-ended or differential signals, support input ranges from –0.5 V to AVDD/2, and exhibit only 2 pF input capacitance. Verified in the AD9281ARSZRL datasheet's "On-Chip Analog Input Buffers" feature and Figure 16, this capability allows direct connection to passive antialias filters, transformer-coupled sources, or resistive dividers-reducing BOM count and signal path noise.

AD9281ARSZRL Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 28-SSOP (0.209", 5.30mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Number of Bits:: 8

Sampling Rate (Per Second):: 28M

Number of Inputs:: 2

Input Type:: Differential, Single Ended

Data Interface:: Parallel

Configuration:: S/H-ADC

Ratio - S/H:ADC:: 1:1

Number of A/D Converters:: 2

Architecture:: Pipelined

Reference Type:: External, Internal

Voltage - Supply, Analog:: 2.7V ~ 5.5V

Voltage - Supply, Digital:: 2.7V ~ 5.5V

Features:: Simultaneous Sampling

Operating Temperature:: -40°C ~ 85°C

Supplier Device Package:: 28-SSOP

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

AD9281ARSZRL FAQ

1.How can I place an order for AD9281ARSZRL through Aetrix?

Please submit a Request for Quotation (RFQ) for AD9281ARSZRL 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 AD9281ARSZRL reliable?

The price and inventory of AD9281ARSZRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD9281ARSZRL is usually 5 days.

3.What payment methods are accepted for AD9281ARSZRL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD9281ARSZRL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD9281ARSZRL?

AD9281ARSZRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD9281ARSZRL 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 AD9281ARSZRL?

For technical support, including AD9281ARSZRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD9281ARSZRL requirements.

6.How does Aetrix verify that AD9281ARSZRL is sourced from the original manufacturer or authorized distributors?

All AD9281ARSZRL 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 AD9281ARSZRL meets industry standards.

7.What is the process for return or replacement of AD9281ARSZRL?

All AD9281ARSZRL units undergo pre-shipment inspection (PSI). If there is an issue with AD9281ARSZRL, 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 AD9281ARSZRL part is unused and in its original packaging.

Return procedure for AD9281ARSZRL:

1.Submit a request within 90 days.

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

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