Part A
AD9220AR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5982 PCS
- Package
- SOIC-28
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD9221ARS-REEL is a functionally compatible replacement candidate for the AD9220AR, sharing the same 12-bit resolution, 28-pin SSOP package, and 5 V supply architecture, though the AD9221 offers a lower maximum sampling rate of 1.5 MSPS versus the AD9220's 10 MSPS. Designers should validate timing margins and dynamic performance in the target application before committing to the substitution.
Resolution
High match
Package Type
High match
Sampling Rate
Validation required
Supply Voltage
High match
Parts at a glance
Part B
AD9221ARS-REEL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8495 PCS
- Package
- SSOP-28
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD9220AR | AD9221ARS-REEL | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so digital output word width is identical and no resolution-related redesign is needed. |
| Sampling Rate | 10 MSPS | 1.5 MSPS | The maximum conversion rate differs significantly; the AD9220AR supports much higher input bandwidth applications than the AD9221ARS-REEL. |
| Package / Case | 28-SOIC | 20-SSOP | Different package footprints and pin counts mean the parts are not drop-in compatible on the same PCB layout. |
| Number of Pins | 28 | 20 | Pin count affects footprint, routing, and whether an existing board can accept the alternate device. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Both operate from a single 5 V supply, so power rail requirements are compatible. |
| Power Consumption | ~310 mW | ~70 mW | The AD9221ARS-REEL consumes substantially less power, which matters for thermal and battery-operated designs. |
| Input Type | Differential | Differential | Both accept differential analog inputs, so the analog front-end topology can remain the same. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature ranges mean both suit the same environmental conditions. |
| SNR | ~70 dB | ~70 dB | Similar signal-to-noise ratio indicates comparable dynamic performance for both converters. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9220AR | AD9221ARS-REEL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 10M | 1.5M |
| Number of Inputs | 1 | 1 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | Parallel | Parallel |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | Pipelined | Pipelined |
| Reference Type | External, Internal | Internal |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD9220AR and AD9221ARS-REEL?
The AD9220AR is a 12-bit, 10 MSPS analog-to-digital converter in a 28-lead SOIC package, while the AD9221ARS-REEL is a 12-bit, 1.5 MSPS ADC in a 28-lead SSOP package supplied in tape-and-reel format. The primary differences are maximum sampling rate, package type, and packaging format for automated assembly.
Are the AD9220AR and AD9221ARS-REEL pin-compatible?
No. The AD9220AR uses a 28-lead SOIC (RW-28) package, whereas the AD9221ARS-REEL uses a 28-lead SSOP (RS-28) package. The package footprints and land patterns differ, so they are not drop-in replacements on the same PCB layout.
Do both parts share the same resolution and input architecture?
Yes. Both are 12-bit monolithic ADCs from Analog Devices using a pipelined switched-capacitor architecture with a differential input. Both provide a 12-bit parallel output and operate from a single 5 V analog supply with a separate digital supply.
How do the maximum sampling rates compare?
The AD9220AR supports a maximum sampling rate of 10 MSPS, while the AD9221ARS-REEL supports a maximum sampling rate of 1.5 MSPS. The AD9220AR is therefore suited to higher-bandwidth signal chains, whereas the AD9221ARS-REEL targets lower-speed, lower-power applications.
Can the AD9221ARS-REEL be used as a lower-speed substitute for the AD9220AR?
Only after validating the reduced 1.5 MSPS throughput against the system's bandwidth requirements and confirming the SSOP footprint is accommodated on the PCB. The parts are not pin-compatible, so a layout change is required regardless of speed considerations.
Why is the AD9221ARS-REEL supplied in tape-and-reel format?
The -REEL suffix indicates the AD9221ARS is delivered in tape-and-reel packaging, which is intended for high-volume automated pick-and-place assembly lines. The AD9220AR is supplied in standard tube or tray packaging for the SOIC package.
Do both converters support the same output interface?
Yes. Both devices provide a 12-bit parallel CMOS-compatible output bus and include an out-of-range indicator. The digital output timing and interface style are consistent across the AD9220/AD9221 family, though timing scales with the respective sampling rate.