Part A
AD9225ARS
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 7539 PCS
- Package
- SSOP-28
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The AD9225ARS and AD9221AR-REEL are not drop-in replacements for one another. Although both are 12-bit analog-to-digital converters from Analog Devices, they differ in sampling rate, package footprint, and power consumption, so a direct board-level substitution is not possible without design changes.
Different sampling rate
Different package footprint
Different power consumption
Different pin configuration
Parts at a glance
Part B
AD9221AR-REEL
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 8735 PCS
- Package
- SOIC-28
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | AD9225ARS | AD9221AR-REEL | 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 | 25 MSPS | 1.5 MSPS | The maximum conversion rate determines the input bandwidth the ADC can support; the AD9225 is far faster and not a drop-in for high-speed sampling. |
| Input Type | Differential | Differential | Both accept differential inputs, allowing similar front-end amplifier and anti-alias filter topologies. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Matching single 5 V supply simplifies power-rail reuse when swapping parts on an existing board. |
| Power Consumption | Approx. 280 mW | Approx. 70 mW | Lower power in the AD9221 reduces thermal load, but the AD9225's higher dissipation must be accounted for in layout and enclosure design. |
| Package | 28-lead SSOP | 28-lead SSOP | Identical package and pin count allow the same PCB footprint, though pin functions must still be verified. |
| Output Interface | Parallel CMOS | Parallel CMOS | Both provide parallel CMOS outputs, so the digital capture interface (FPGA/MCU) can remain unchanged. |
| SNR | Approx. 71 dB | Approx. 70 dB | Similar signal-to-noise ratio means comparable dynamic range for the same input signal amplitude. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching industrial temperature ranges allow either part to be used in the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9225ARS | AD9221AR-REEL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 25M | 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 | 2.85V ~ 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 AD9225ARS and AD9221AR-REEL?
The AD9225ARS is a 12-bit, 25 MSPS analog-to-digital converter, while the AD9221AR-REEL is a 12-bit, 1.5 MSPS ADC. Both are members of Analog Devices' AD922x family and share a similar architecture, but they differ primarily in maximum sampling rate, power consumption, and package options. The AD9225ARS is supplied in a 28-lead SSOP, whereas the AD9221AR-REEL is supplied in a 28-lead SOIC in tape-and-reel packaging.
Can the AD9225ARS and AD9221AR-REEL be used interchangeably in an existing design?
No, they are not directly interchangeable. Although both are 12-bit ADCs with similar pin functions, the AD9225ARS supports a 25 MSPS maximum sample rate versus 1.5 MSPS for the AD9221AR-REEL, and their packages differ (SSOP vs SOIC). PCB land patterns, thermal characteristics, and timing budgets must be revalidated before any substitution.
What is the maximum sampling rate of each device?
The AD9225ARS has a maximum sampling rate of 25 MSPS. The AD9221AR-REEL has a maximum sampling rate of 1.5 MSPS. Designs requiring higher throughput should select the AD9225ARS, while lower-speed applications may use the AD9221AR-REEL.
Do both parts offer the same resolution and input range?
Yes, both are 12-bit ADCs. The AD9225ARS provides a differential input range of 2 V p-p, and the AD9221AR-REEL also provides a 2 V p-p differential input range, allowing similar signal-chain design approaches when the sampling-rate difference is acceptable.
How do the power consumption figures compare?
The AD9225ARS typically consumes about 280 mW at 25 MSPS. The AD9221AR-REEL typically consumes about 60 mW at 1.5 MSPS. Lower sampling rate operation in the AD9221AR-REEL results in significantly lower power dissipation, which can be advantageous in power-sensitive designs.
What package and packaging options are available for each part?
The AD9225ARS is offered in a 28-lead SSOP package. The AD9221AR-REEL is offered in a 28-lead SOIC package and is supplied in tape-and-reel format for automated assembly. The different package footprints require separate PCB land patterns.
Are the AD9225ARS and AD9221AR-REEL pin-compatible?
No, they are not pin-compatible. The AD9225ARS uses a 28-lead SSOP package, while the AD9221AR-REEL uses a 28-lead SOIC package. Although both are 28-lead devices with similar functional pin assignments, the physical package dimensions and lead pitch differ, so they cannot be dropped into the same PCB footprint.
Which part is better suited for high-speed data acquisition systems?
The AD9225ARS is better suited for high-speed data acquisition because its 25 MSPS maximum sampling rate supports wider signal bandwidths than the 1.5 MSPS rate of the AD9221AR-REEL. The AD9221AR-REEL is more appropriate for lower-speed, power-sensitive applications.