Part A
AD9220AR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5982 PCS
- Package
- SOIC-28
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD9221AR is a functionally compatible replacement candidate for the AD9220AR, sharing the same 12-bit resolution, 28-lead SOIC package, and pin-compatible analog front-end architecture. The primary distinction is the maximum sampling rate, where the AD9221AR offers a lower throughput than the AD9220AR. Designers must confirm that the reduced conversion rate satisfies the target application's timing budget before substituting the AD9221AR in place of the AD9220AR.
Resolution
High match
Package Type
High match
Maximum Sampling Rate
Validation required
Analog Input Interface
High match
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 | AD9221AR | Why it matters |
|---|---|---|---|
| Resolution | 12 bits | 12 bits | Both converters provide 12-bit resolution, so quantization accuracy is equivalent and neither offers a resolution advantage for substitutability. |
| Maximum Sampling Rate | 10 MSPS | 1.5 MSPS | The AD9220AR supports a much higher throughput, so it can replace the AD9221AR in faster signal chains, but the reverse substitution would limit achievable sample rate. |
| Input Type | Differential (with internal sample-and-hold) | Differential (with internal sample-and-hold) | Identical differential input architecture means the analog front-end design and drive requirements are compatible between the two parts. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Matching single 5 V supply simplifies board-level substitution without changing power regulation or level-shifting circuitry. |
| Power Consumption | Approximately 250 mW (typical) | Approximately 60 mW (typical) | The AD9221AR draws significantly less power, which matters for thermal budget and energy-sensitive designs when choosing between the two. |
| SNR (Signal-to-Noise Ratio) | Approximately 70 dB | Approximately 70 dB | Comparable SNR indicates similar noise performance, so dynamic-range requirements are met by either device in most applications. |
| Package | 28-lead SOIC | 28-lead SOIC | Identical package and pinout allow direct drop-in replacement on an existing PCB footprint. |
| Output Interface | Parallel CMOS | Parallel CMOS | Same parallel CMOS output format means the digital host interface and timing logic remain compatible across both parts. |
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 | AD9221AR |
|---|---|---|
| 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 AD9221AR?
The AD9220AR is a 12-bit, 10 MSPS analog-to-digital converter, while the AD9221AR is a 12-bit, 1.5 MSPS ADC. Both are monolithic sampling ADCs from Analog Devices in a 28-lead SOIC package, but they differ primarily in maximum sampling rate and corresponding power consumption.
Do the AD9220AR and AD9221AR have the same pinout and package?
Yes. Both devices are offered in a 28-lead SOIC (R-28) package with the same pin configuration, allowing board-level interchangeability when the system timing and power budget support the different sampling rates.
What are the maximum sampling rates of the AD9220AR and AD9221AR?
The AD9220AR supports a maximum sampling rate of 10 MSPS, whereas the AD9221AR supports a maximum sampling rate of 1.5 MSPS. Designs requiring higher throughput should use the AD9220AR.
How does power consumption compare between the AD9220AR and AD9221AR?
The AD9220AR typically consumes about 250 mW at 10 MSPS, while the AD9221AR typically consumes about 70 mW at 1.5 MSPS. Lower sampling rate operation in the AD9221AR results in significantly reduced power dissipation.
Are the AD9220AR and AD9221AR both 12-bit ADCs with the same input range?
Yes. Both are 12-bit ADCs featuring a differential input with a 2 V peak-to-peak input span and an on-chip sample-and-hold amplifier, providing similar DC accuracy and dynamic performance characteristics at their respective rated speeds.
Can the AD9221AR be used as a drop-in replacement for the AD9220AR?
Pin compatibility allows physical replacement, but the AD9221AR's lower 1.5 MSPS maximum rate and different timing specifications must be validated against the system's sampling requirements before substitution. The AD9220AR cannot be replaced by the AD9221AR in applications requiring more than 1.5 MSPS.
What is the operating temperature range for the AD9220AR and AD9221AR?
Both the AD9220AR and AD9221AR are specified for the industrial temperature range of -40°C to +85°C, making them suitable for industrial and instrumentation applications.