Part A
AD9225ARS
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7539 PCS
- Package
- SSOP-28
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD9221ARS is a lower-speed, lower-power member of the same AD922x 12-bit ADC family as the AD9225ARS, sharing an identical 28-lead SSOP footprint and parallel output architecture. It can serve as a functional replacement where the reduced 1.5 MSPS maximum sampling rate and narrower analog input bandwidth remain acceptable, but the design must be revalidated for dynamic performance and timing margins.
Resolution and Output Interface
High match
Package and Pinout
High match
Maximum Sampling Rate
Validation required
Analog Input Bandwidth
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 | AD9225ARS | AD9221ARS | Why it matters |
|---|---|---|---|
| Resolution | 12 bits | 12 bits | Both converters provide 12-bit resolution, so quantization granularity is equivalent for signal-chain design. |
| Maximum Sampling Rate | 25 MSPS | 1.5 MSPS | The AD9225 supports much higher throughput, so it can digitize faster signals while the AD9221 is limited to lower-bandwidth applications. |
| Input Type | Differential | Differential | Both accept differential inputs, which helps reject common-mode noise and improves dynamic performance. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Identical single 5 V supply simplifies power-rail design and allows drop-in compatibility in the same system. |
| Power Consumption | Approximately 280 mW | Approximately 70 mW | The AD9221 dissipates significantly less power, which matters for thermally constrained or battery-powered designs. |
| SNR (Signal-to-Noise Ratio) | Approximately 71 dB | Approximately 70 dB | Similar SNR indicates comparable noise performance, though the higher-speed AD9225 maintains it at much higher sample rates. |
| Package | 28-lead SSOP | 28-lead SSOP | Identical package and pinout allow physical board compatibility between the two parts. |
| Output Interface | Parallel CMOS | Parallel CMOS | Both use parallel CMOS outputs, so the digital interface to an FPGA or DSP is the same. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching industrial temperature ranges mean both parts suit the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9225ARS | AD9221ARS |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| 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 AD9221ARS?
The AD9225ARS is a 12-bit, 25 MSPS analog-to-digital converter, while the AD9221ARS is a 12-bit, 1.5 MSPS ADC. Both are members of Analog Devices' AD922x family, offered in a 28-lead SSOP (RS) package, but they differ primarily in maximum sampling rate, power consumption, and dynamic performance. The AD9225 supports much higher throughput and consumes more power, whereas the AD9221 is optimized for lower-speed, lower-power applications.
Are the AD9225ARS and AD9221ARS pin-compatible?
Yes. Both devices are members of the same AD922x family and are supplied in the same 28-lead SSOP (RS) package with a common pinout, which allows them to share a PCB footprint. However, pin compatibility does not guarantee functional interchangeability; the system clock rate, power budget, and dynamic performance requirements must be validated against the respective datasheets before substitution.
What is the maximum sampling rate of each device?
The AD9225ARS is specified for a maximum sampling rate of 25 MSPS. The AD9221ARS is specified for a maximum sampling rate of 1.5 MSPS. Designs requiring higher throughput should use the AD9225, while the AD9221 is intended for lower-speed signal chains.
How do the power consumption figures compare?
The AD9225ARS typically dissipates about 280 mW at 25 MSPS from a single 5 V supply. The AD9221ARS typically dissipates about 60 mW at 1.5 MSPS from a single 5 V supply. The lower power of the AD9221 makes it preferable for power-sensitive, lower-speed designs, while the AD9225 trades higher power for higher throughput.
Do both converters offer the same resolution and input range?
Yes. Both the AD9225ARS and AD9221ARS are 12-bit ADCs with a differential input and an on-chip sample-and-hold amplifier. Both support a 2 V peak-to-peak differential input span and operate from a single 5 V analog supply, with a separate digital supply pin for interfacing. The principal differences lie in speed, power, and AC performance rather than resolution or input configuration.
Can the AD9221ARS be used as a drop-in replacement for the AD9225ARS in an existing design?
Not unconditionally. Although the devices share the same package and pinout, the AD9221ARS has a much lower maximum sampling rate (1.5 MSPS versus 25 MSPS) and different dynamic performance. A design clocked above 1.5 MSPS, or one relying on the AD9225's AC specifications, cannot use the AD9221ARS without revalidation. Substitution should only be made after confirming clock rate, SNR/SFDR, and power budget against the AD9221ARS datasheet.
What are the typical applications for each device?
The AD9225ARS is suited to higher-speed signal acquisition such as medical imaging, CCD/camera digitization, and high-speed data acquisition where 25 MSPS throughput is required. The AD9221ARS is intended for lower-speed, power-sensitive applications such as portable instrumentation, battery-powered measurement systems, and general-purpose data acquisition operating at or below 1.5 MSPS.