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Analog Devices Inc. AD9221ARS-REEL
- Part No.:
- AD9221ARS-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
AD9221ARS-REEL.pdf
- Description:
- IC ADC 12BIT PIPELINED 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,395
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Product details
Overview
AD9221ARS-REEL from Analog Devices is a monolithic 12-bit, 1.5 MSPS analog-to-digital converter with on-chip sample-and-hold amplifier and programmable voltage reference. It operates from a single 5 V analog supply and 3–5 V digital supply, delivers 70 dB SINAD and 86 dB SFDR at 100 kHz input, and features ±0.4 LSB typical INL, 0.09 LSB input-referred noise (VREF = 2.5 V), and out-of-range (OTR) indicator - used in precision data acquisition and imaging front-ends.
For engineers reviewing the AD9221ARS-REEL datasheet, AD9221ARS-REEL pinout, AD9221ARS-REEL application, or AD9221ARS-REEL equivalent, key selection criteria include guaranteed no missing codes over temperature, straight binary output format, 28-pin SSOP package compatibility, and differential/single-ended input flexibility with midsupply common-mode support.
Technical Context
The AD9221ARS-REEL employs a four-stage differential pipelined architecture with digital error correction logic, enabling true 12-bit accuracy and guaranteed no missing codes across –40°C to +85°C. Its sample-and-hold amplifier supports both single-ended and differential inputs with configurable span (2 V or 5 V p-p) and common-mode voltage (1 V or 2.5 V).
Internal timing uses a single rising-edge-triggered clock; conversion latency is fixed at three clock cycles. The device integrates a programmable internal voltage reference (1 V or 2.5 V) and accepts external references, with dedicated SENSE, VREF, REFCOM, CAPT, and CAPB pins for reference stability and noise reduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit guaranteed, no missing codes over full temperature range - ensures deterministic digital representation of analog input without code gaps. |
| Max Conversion Rate | 1.5 MSPS - defines maximum sustained sampling frequency for real-time signal capture in medium-speed applications. |
| INL (Typ) | ±0.4 LSB - limits integral nonlinearity error to <0.1% of full scale, critical for high-fidelity measurement linearity. |
| SINAD (Typ) | 70 dB at 100 kHz - indicates effective dynamic range of ~11.3 ENOB, suitable for 10+ bit ac-coupled signal chains. |
| Input-Referred Noise | 0.09 LSB rms (VREF = 2.5 V) - contributes <0.0022% RMS noise to full-scale input, supporting low-noise sensor interfacing. |
| Power Consumption | 59 mW typical (AVDD = 5 V, DVDD = 5 V) - enables low-power embedded data acquisition without active cooling. |
| Supply Range (DVDD) | 2.7 V to 5.25 V - allows interoperability with 3.3 V or 5 V logic families and mixed-supply system integration. |
Pinout & Package
AD9221ARS-REEL is housed in a 28-lead SSOP (RS-28) package with 0.635 mm lead pitch and exposed pad thermal design. Pin layout matches AD9221AR (SOIC) functionally but differs mechanically; SSOP offers higher density and improved thermal resistance (θJA = 63.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLK | Clock input | Rising-edge-triggered master clock; minimum pulse width 300 ns - determines sampling instant and pipeline timing. |
| VINA / VINB | Differential analog inputs | Accepts single-ended or differential signals; input core voltage = VINA – VINB, bounded by ±VREF - enables flexible sensor/IF interface. |
| BIT 1 (MSB) to BIT 12 (LSB) | Parallel digital outputs | Straight binary format, CMOS-compatible; latched on clock edge - simplifies FPGA/microcontroller interface without data formatting. |
| OTR | Out-of-range indicator | Active-high flag signaling overflow beyond ±VREF - used with MSB to distinguish high/low saturation in real-time monitoring. |
| SENSE | Reference mode select | Logic-high selects 2.5 V internal reference; logic-low selects 1 V mode - configures full-scale input span without external components. |
| VREF / REFCOM / CAPT / CAPB | Reference subsystem | VREF is reference I/O; REFCOM is reference ground; CAPT/CAPB stabilize internal reference - essential for dc accuracy and low-drift operation. |
| AVDD / AVSS / DVDD / DVSS | Power and ground rails | Separate analog/digital supplies reduce coupling noise; AVSS and DVSS must be tied at single point - mandatory for SNR preservation. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip sample-and-hold amplifier | Supports full-scale step acquisition in 125 ns and 25 MHz full-power bandwidth - enables accurate digitization of fast transients and multiplexed channel switching. |
| Programmable internal voltage reference | 1 V or 2.5 V output with ±35 mV tolerance (2.5 V mode) - eliminates external reference IC, reduces BOM count, and maintains <±2 ppm/°C gain drift. |
| Differential input architecture | Rejects common-mode noise up to 60 dB while enabling single-ended use via VINB bias - simplifies PCB layout in noisy industrial environments. |
| Low aperture jitter | 4 ps rms - limits sampling uncertainty-induced noise floor degradation, preserving >11-bit ENOB up to Nyquist. |
| Flexible digital interface | Output drivers compatible with 3.3 V or 5 V logic; VOH = 4.5 V min (IOH = 50 µA) at DVDD = 5 V - ensures robust level-shifting to diverse host processors. |
Applications
| Medical Ultrasound Beamforming | Industrial Process Monitoring |
|---|---|
|
Use Scenario: Digitizing echo return signals from phased-array transducers at 1–5 MSPS equivalent rates using time-interleaved channels. IC Role / Device Role / Timing Role: ADC front-end capturing baseband IF samples with 70 dB SINAD and low harmonic distortion to preserve tissue contrast resolution. Use Value: 0.09 LSB input-referred noise and 86 dB SFDR enable detection of weak echoes amid strong clutter, directly improving diagnostic sensitivity. |
Use Scenario: High-accuracy voltage/current sensing in PLC analog input modules with 0.1% total unadjusted error requirement. IC Role / Device Role / Timing Role: Precision digitizer for 4–20 mA loop receivers and strain gauge bridges, operating at 1.5 MSPS with DC-coupled inputs. Use Value: ±0.4 LSB INL and ±0.3 LSB DNL ensure calibrated linearity over temperature, eliminating need for per-unit firmware correction. |
| Communications Direct-IF Receiver | Test & Measurement Digitizers |
|
Use Scenario: Downconverting RF signals to baseband in software-defined radios, where ADC samples complex IF at 1.5 MSPS with quadrature demodulation. IC Role / Device Role / Timing Role: Differential-input ADC accepting I/Q signals centered at 2.5 V common-mode, leveraging symmetry for >60 dB CMRR. Use Value: Differential architecture and 4 ps aperture jitter maintain phase coherence between I/Q paths, minimizing EVM degradation in QPSK systems. |
Use Scenario: Portable oscilloscope front-end requiring 12-bit resolution, 1.5 MSPS sustained rate, and battery-operated low power. IC Role / Device Role / Timing Role: Core ADC in 100 kHz–1 MHz bandwidth instruments, using internal 2.5 V reference and OTR for auto-ranging. Use Value: 59 mW typical power and SSOP package enable compact, fanless designs without sacrificing dc accuracy or dynamic performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, medium-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9221AR-REEL | Identical electrical specs and pinout, but in 28-lead SOIC (R-28) instead of SSOP - larger footprint, higher θJA (71.4°C/W). | Preferred where board space permits and thermal margin is less constrained; not suitable for high-density layouts. | Select AD9221AR-REEL only when SOIC handling or legacy footprint compatibility is required; AD9221ARS-REEL offers superior thermal performance and density. |
| ADS8320U | 16-bit, 1 MSPS SAR ADC (TI); no on-chip SHA or reference; requires external driver and reference; serial SPI interface. | Better resolution for slow-scan applications (e.g., precision thermocouple reading), but lacks pipeline latency tolerance and real-time throughput. | Choose ADS8320U only when 16-bit dc accuracy outweighs speed and integration needs; AD9221ARS-REEL provides faster, self-contained digitization for dynamic signals. |
Compared with AD9221AR-REEL, AD9221ARS-REEL delivers identical conversion performance in a smaller, thermally optimized SSOP package - ideal for space-constrained industrial and portable designs. Versus ADS8320U, it trades resolution for integrated functionality, lower latency, and higher sustained throughput in real-time acquisition systems.
Availability
AD9221ARS-REEL is available at Aetrix Electronics and suitable for medical ultrasound beamforming, industrial process monitoring, communications direct-IF receivers, and portable test equipment requiring stable component supply and long-term production continuity.
Supply support for AD9221ARS-REEL 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.
The AD9221ARS-REEL belongs to Analog Devices' monolithic pipelined ADC family designed for cost-sensitive, medium-speed data acquisition systems requiring integrated reference, low power, and guaranteed 12-bit linearity without missing codes.
FAQ
What is the maximum sampling rate supported by the AD9221ARS-REEL?
The AD9221ARS-REEL supports a maximum conversion rate of 1.5 MSPS, as specified in its datasheet under "MAX CONVERSION RATE" for the AD9221 variant. This rate is guaranteed across the full operating temperature range (–40°C to +85°C) with AVDD = 5 V and DVDD = 5 V. Exceeding this rate degrades AC performance metrics including SINAD and SFDR.
Does the AD9221ARS-REEL require an external voltage reference?
No, the AD9221ARS-REEL includes a programmable internal voltage reference that can be configured for either 1 V or 2.5 V output via the SENSE pin. While an external reference may be used for enhanced dc accuracy or temperature stability, the internal reference delivers ±35 mV tolerance (2.5 V mode) and supports full 12-bit linearity in the AD9221ARS-REEL.
How is the out-of-range (OTR) signal used in the AD9221ARS-REEL?
The OTR signal in the AD9221ARS-REEL is an active-high indicator that asserts when the analog input exceeds ±VREF, signaling overflow. Used alongside the MSB (BIT 1), it distinguishes between high- and low-saturation conditions - for example, OTR high with BIT 1 high indicates positive overflow, while OTR high with BIT 1 low indicates negative overflow - enabling precise clipping diagnostics in real time.
What package type does the AD9221ARS-REEL use, and how does it differ from AD9221AR?
The AD9221ARS-REEL uses a 28-lead SSOP (RS-28) package with 0.635 mm lead pitch, whereas AD9221AR uses a 28-lead SOIC (R-28). The SSOP offers higher pin density and lower thermal resistance (θJA = 63.3°C/W vs. 71.4°C/W), making AD9221ARS-REEL better suited for compact, thermally demanding applications without sacrificing pin compatibility or electrical performance.
Can the AD9221ARS-REEL operate with a 3.3 V digital supply?
Yes, the AD9221ARS-REEL supports DVDD from 2.7 V to 5.25 V, fully accommodating 3.3 V digital systems. Its digital outputs meet VOH ≥ 2.80 V (IOH = 0.5 mA) and VOL ≤ 0.4 V (IOL = 1.6 mA) at DVDD = 3 V, ensuring reliable interfacing with 3.3 V FPGAs, microcontrollers, and logic families without level shifters.
AD9221ARS-REEL 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:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 1.5M
- Number of Inputs:
- 1
- Input Type:
- Differential, Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Pipelined
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD9221ARS-REEL FAQ
1.How can I place an order for AD9221ARS-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD9221ARS-REEL 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 AD9221ARS-REEL reliable?
The price and inventory of AD9221ARS-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD9221ARS-REEL is usually 5 days.
3.What payment methods are accepted for AD9221ARS-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD9221ARS-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD9221ARS-REEL?
AD9221ARS-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD9221ARS-REEL 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 AD9221ARS-REEL?
For technical support, including AD9221ARS-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD9221ARS-REEL requirements.
6.How does Aetrix verify that AD9221ARS-REEL is sourced from the original manufacturer or authorized distributors?
All AD9221ARS-REEL 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 AD9221ARS-REEL meets industry standards.
7.What is the process for return or replacement of AD9221ARS-REEL?
All AD9221ARS-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD9221ARS-REEL, 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 AD9221ARS-REEL part is unused and in its original packaging.
Return procedure for AD9221ARS-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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