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 is a pin-compatible, functionally equivalent alternative to the AD9220AR, sharing the same 12-bit resolution, 28-pin SSOP package, and analog input architecture. The primary distinction is the maximum sampling rate, which must be validated against the target application's timing requirements before substitution.
Resolution
High match
Package Type
High match
Sampling Rate
Validation required
Analog Input Type
High match
Parts at a glance
Part B
AD9221ARS
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3465 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 | Why it matters |
|---|---|---|---|
| Resolution | 12 bits | 12 bits | Both converters provide 12-bit resolution, so quantization granularity is equivalent for signal-chain design. |
| Sampling Rate | 10 MSPS | 1.5 MSPS | The maximum conversion rate determines the usable input bandwidth and whether the part fits high-speed acquisition requirements. |
| Package / Mounting | 28-lead SOIC (surface mount) | 28-lead SSOP (surface mount) | Different package footprints require different PCB land patterns, so they are not drop-in board replacements. |
| Power Consumption | ~310 mW typical | ~70 mW typical | Lower power dissipation affects thermal design and is critical in power-sensitive or portable systems. |
| Supply Voltage | 5 V analog and digital | 5 V analog and digital | Matching supply rails simplifies power-rail reuse, though current draw differs significantly between the two. |
| Input Type | Differential | Differential | Differential inputs improve noise immunity and common-mode rejection, and both parts support the same input topology. |
| SNR (Signal-to-Noise Ratio) | ~70 dB | ~70 dB | Comparable SNR indicates similar dynamic performance for a given input, supporting functional similarity in noise-limited designs. |
| Output Interface | Parallel CMOS | Parallel CMOS | Identical output format allows reuse of the same digital interface and FPGA/controller capture logic. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Equivalent industrial temperature ratings mean both suit the same environmental conditions. |
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 |
|---|---|---|
| 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?
The AD9220AR is a 12-bit, 10 MSPS analog-to-digital converter, while the AD9221ARS is a 12-bit, 1.5 MSPS ADC. Both are monolithic sampling ADCs from Analog Devices, but they differ in maximum sampling rate, power consumption, and package type. The AD9220AR is supplied in a 28-lead SOIC package, whereas the AD9221ARS is supplied in a 28-lead SSOP package.
Are the AD9220AR and AD9221ARS pin-compatible?
No. The AD9220AR uses a 28-lead SOIC package and the AD9221ARS uses a 28-lead SSOP package. Because the package footprints and land patterns differ, they are not drop-in replacements on the same PCB without layout changes.
What is the maximum sampling rate of each device?
The AD9220AR has a maximum sampling rate of 10 MSPS. The AD9221ARS has a maximum sampling rate of 1.5 MSPS. The sampling rate difference is the primary performance distinction between the two parts.
Do both converters provide 12-bit resolution?
Yes. Both the AD9220AR and AD9221ARS are 12-bit analog-to-digital converters, providing 12-bit output resolution over their respective specified sampling rate ranges.
How does power consumption compare between the AD9220AR and AD9221ARS?
The AD9220AR typically consumes approximately 250 mW at 10 MSPS, while the AD9221ARS typically consumes approximately 60 mW at 1.5 MSPS. Lower power in the AD9221ARS is consistent with its lower maximum sampling rate.
Can the AD9221ARS be used as a lower-speed substitute for the AD9220AR?
Only if the system can tolerate a maximum sampling rate of 1.5 MSPS instead of 10 MSPS and the PCB is redesigned for the SSOP package. The two devices are not pin-compatible, so substitution requires layout changes and validation against the target design requirements.
What analog input configuration do these ADCs use?
Both the AD9220AR and AD9221ARS feature a differential analog input with an on-chip sample-and-hold amplifier. They are specified for operation from a single +5 V supply and provide a flexible input range configuration.