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 AD9225ARS and AD9220ARS are both 12-bit monolithic A/D converters from Analog Devices in a 28-lead SSOP package, sharing the same pinout and supply architecture, so the AD9225ARS can serve as a functional replacement candidate for the AD9220ARS in many designs. However, the AD9225ARS offers a higher maximum sampling rate and a wider analog input bandwidth, which may require validation of the surrounding clock, input drive, and power budget. Designers should confirm timing margins and thermal performance before committing to the substitution.
Sampling Rate
Validation required
Resolution
High match
Package Type
High match
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 | AD9220ARS | 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 | 10 MSPS | The AD9225 supports a much higher throughput, enabling wider input bandwidth and faster data acquisition than the AD9220. |
| Input Type | Differential | Single-ended | Differential input offers better common-mode rejection and noise immunity, while single-ended input simplifies the analog front end. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Both operate from a single 5 V supply, so power-rail requirements are compatible for substitution. |
| Power Consumption | ~280 mW | ~100 mW | The AD9220 consumes significantly less power, which matters for thermally constrained or battery-powered designs. |
| SNR (Signal-to-Noise Ratio) | ~71 dB | ~70 dB | Similar SNR indicates comparable dynamic range, though the AD9225 has a slight edge at higher sampling rates. |
| Package | 28-lead SSOP | 28-lead SSOP | Identical package and pin count allow drop-in board compatibility without layout changes. |
| Output Interface | Parallel CMOS | Parallel CMOS | Matching parallel CMOS outputs ensure the same digital host interface can be reused. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical industrial temperature ratings mean both parts suit the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9225ARS | AD9220ARS |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 25M | 10M |
| 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 | External, 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 AD9220ARS?
The AD9225ARS is a 12-bit, 25 MSPS analog-to-digital converter, while the AD9220ARS is a 12-bit, 10 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 specifications.
Are the AD9225ARS and AD9220ARS pin-compatible?
Yes. Both devices are specified in the same 28-lead SSOP (RS) package and share the same pinout within the AD922x family, allowing a common PCB footprint. However, pin compatibility does not guarantee that one can be substituted for the other without validating sampling rate, timing, and performance requirements in the target design.
What is the maximum sampling rate of each device?
The AD9225ARS is specified for a maximum sampling rate of 25 MSPS, and the AD9220ARS is specified for a maximum sampling rate of 10 MSPS. Designs requiring sample rates above 10 MSPS must use the higher-speed device or another appropriately rated converter.
How do the power consumption figures compare?
The AD9225ARS typically dissipates about 280 mW from a single 5 V supply at 25 MSPS, while the AD9220ARS typically dissipates about 160 mW at 10 MSPS. The lower power of the AD9220ARS reflects its reduced maximum sampling rate.
Do both converters operate from a single 5 V supply?
Yes. Both the AD9225ARS and AD9220ARS operate from a single 5 V analog supply and provide a flexible on-chip reference and input range options. Designers should confirm supply tolerances and decoupling requirements against the respective datasheets.
What dynamic performance can be expected from each part?
Both are 12-bit converters with on-chip sample-and-hold amplifiers. The AD9225ARS provides superior AC performance at its 25 MSPS rate, including a typical SNR of approximately 71 dB and SFDR around 85 dBc for analog input frequencies in the specified test conditions. The AD9220ARS offers comparable 12-bit linearity at its 10 MSPS rate, with SNR typically around 70 dB. Exact values depend on input frequency and should be taken from the manufacturer datasheets.
Can the AD9220ARS be used as a drop-in replacement for the AD9225ARS?
Only if the system's maximum sampling rate requirement is 10 MSPS or lower and all timing, power, and dynamic performance specifications meet the design margins. Because the AD9225ARS supports up to 25 MSPS, replacing it with the AD9220ARS would reduce the maximum conversion rate and may violate timing assumptions in the existing design.
What package do the AD9225ARS and AD9220ARS use?
Both devices are offered in a 28-lead SSOP package, denoted by the "RS" suffix in the part number. This package designation is consistent across the AD922x family and supports a shared PCB land pattern.