Part A
AD9221ARSZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2958 PCS
- Package
- SSOP-28
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD9221ARSZ and AD9225AR are both 12-bit monolithic A/D converters from Analog Devices in a 28-lead SSOP package, sharing a compatible analog input range and supply architecture. However, they differ in maximum sampling rate (1.5 MSPS vs 25 MSPS) and power consumption, so the AD9225AR can serve as a higher-speed functional substitute for the AD9221ARSZ only when the system clock, timing, and thermal budget are validated against the faster device's requirements.
Resolution
High match
Package Type
High match
Maximum Sampling Rate
Validation required
Power Consumption
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD9221ARSZ | AD9225AR | Why it matters |
|---|---|---|---|
| Resolution | 12 bits | 12 bits | Both are 12-bit ADCs, so nominal quantization resolution is identical and not a differentiator for substitutability. |
| Sampling Rate | 1.5 MSPS | 25 MSPS | The maximum conversion rate determines the input signal bandwidth the ADC can support; the AD9225 is far faster, so it is not a drop-in for lower-speed designs but can replace the slower part where higher throughput is needed. |
| Input Type | Differential | Differential | Both accept differential inputs, so the analog front-end topology can remain the same when substituting. |
| Supply Voltage (Analog) | 5 V | 5 V | Matching analog supply rails means the same power supply design can be reused without level shifting. |
| Power Consumption | 59 mW typical | 280 mW typical | Power dissipation affects thermal design and supply sizing; the AD9225 draws substantially more, which may require layout and supply changes. |
| Package / Case | 20-Lead SSOP | 28-Lead SSOP | Different package footprints and pin counts mean the PCB layout must be redesigned; they are not pin-compatible. |
| Output Interface | Parallel CMOS | Parallel CMOS | Both provide parallel CMOS outputs, so the digital interface to the host/FPGA can remain the same. |
| SNR | 70 dB typical | 71.5 dB typical | Signal-to-noise ratio indicates achievable dynamic range; the AD9225 offers slightly better noise performance, relevant for high-accuracy applications. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same industrial environments without derating concerns. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9221ARSZ | AD9225AR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 1.5M | 25M |
| 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 | Internal | External, Internal |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 2.85V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD9221ARSZ and the AD9225AR?
The AD9221ARSZ is a 12-bit, 1.5 MSPS analog-to-digital converter, while the AD9225AR is a 12-bit, 25 MSPS ADC. The AD9225AR offers a significantly higher sampling rate, making it suitable for higher-bandwidth signal acquisition, whereas the AD9221ARSZ targets lower-speed, lower-power applications. Both are 12-bit CMOS ADCs from Analog Devices, but they differ in speed grade, power consumption, and package.
Are the AD9221ARSZ and AD9225AR pin-compatible?
No. The AD9221ARSZ is supplied in a 28-lead SSOP package, while the AD9225AR is supplied in a 28-lead SOIC package. Although both are 28-lead devices, the package types and PCB land patterns differ, so they are not drop-in replacements without layout changes.
What are the maximum sampling rates of these two ADCs?
The AD9221ARSZ has a maximum sampling rate of 1.5 MSPS. The AD9225AR has a maximum sampling rate of 25 MSPS. The AD9225AR is therefore approximately 16 times faster and is intended for higher-frequency signal digitization.
Do the AD9221ARSZ and AD9225AR have the same resolution and input architecture?
Yes. Both are 12-bit ADCs with a pipelined switched-capacitor architecture and differential input capability. They share the same resolution, but their speed, power, and package characteristics differ.
How does power consumption compare between the AD9221ARSZ and AD9225AR?
The AD9221ARSZ typically consumes about 70 mW at 1.5 MSPS, while the AD9225AR typically consumes about 280 mW at 25 MSPS. The higher power of the AD9225AR reflects its much higher sampling rate and associated internal circuitry.
Can the AD9221ARSZ be used as a direct substitute for the AD9225AR in an existing design?
No. Because the two devices differ in package type (SSOP vs SOIC), maximum sampling rate (1.5 MSPS vs 25 MSPS), and power consumption, a direct substitution is not possible without verifying timing, layout, and thermal requirements against the respective datasheets.
What are the typical applications for each device?
The AD9221ARSZ is suited to lower-speed data acquisition, portable instrumentation, and power-sensitive systems where 1.5 MSPS is sufficient. The AD9225AR is intended for higher-speed applications such as medical imaging, communications receivers, and high-speed data acquisition where 25 MSPS sampling is required.