Part A
AD9221ARSZ
ADI公司
- Lifecycle
- Active
- Stock
- 2958 件
- Package
- SSOP-28
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The AD9221ARSZ and AD9220ARS-REEL are both 12-bit monolithic A/D converters from the same Analog Devices AD922x family, sharing a 28-lead SSOP footprint and a 5 V analog supply with a 3 V to 5 V digital output supply. The AD9221ARSZ is a lower-power, lower-speed variant (1.5 MSPS) while the AD9220ARS-REEL offers higher throughput (10 MSPS) with correspondingly higher power consumption. Because the pinout and package are identical, the AD9221ARSZ can serve as a functional replacement candidate for the AD9220ARS-REEL in applications where the reduced 1.5 MSPS sample rate and lower power budget are acceptable; designers must validate dynamic performance and timing margins for their specific signal chain.
Package Type
High match
Resolution
High match
Sample Rate
Validation required
Power Consumption
Validation required
Parts at a glance
Part B
AD9220ARS-REEL
ADI公司
- Lifecycle
- Active
- Stock
- 4696 件
- Package
- SSOP-28
- Series
- 資料獲取-模數轉換器（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 | AD9221ARSZ | AD9220ARS-REEL | 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 | 1.5 MSPS | 10 MSPS | The AD9220 supports a much higher throughput, enabling wider input bandwidth and faster data acquisition than the AD9221. |
| Input Type | Differential (single-ended capable) | Differential (single-ended capable) | Both accept differential inputs, allowing flexible front-end coupling and good common-mode rejection. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Identical single 5 V supply simplifies power-rail design and allows drop-in power compatibility. |
| Power Consumption | ~59 mW typical | ~250 mW typical | The AD9221 consumes significantly less power, which matters for thermally constrained or battery-powered designs. |
| SNR (Signal-to-Noise Ratio) | ~70 dB | ~68 dB | Similar noise performance means both deliver comparable dynamic range for the same input signal. |
| Package | 20-Lead SSOP | 28-Lead SSOP | Different package footprints and pin counts prevent direct board-level substitution without layout changes. |
| Output Interface | Parallel CMOS | Parallel CMOS | Both provide parallel CMOS outputs, so the digital interface to a controller or FPGA is functionally similar. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical industrial temperature ratings allow use in the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9221ARSZ | AD9220ARS-REEL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 1.5M | 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 | Internal | External, 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 AD9221ARSZ and AD9220ARS-REEL?
The AD9221ARSZ is a 12-bit, 1.5 MSPS analog-to-digital converter, while the AD9220ARS-REEL is a 12-bit, 10 MSPS ADC. Both are members of Analog Devices' AD922x family and share a similar architecture, but the AD9220 offers a significantly higher maximum sampling rate. The AD9221ARSZ is supplied in a 28-lead SSOP package in tube form, whereas the AD9220ARS-REEL is the same 28-lead SSOP package supplied on tape and reel for automated assembly.
Are the AD9221ARSZ and AD9220ARS-REEL pin-compatible?
Yes. Both devices are offered in the same 28-lead SSOP (RS) package and belong to the same AD922x family, sharing a common pinout. This allows a single PCB layout to accommodate either converter, though the maximum sampling rate and corresponding timing parameters differ between the two.
What is the maximum sampling rate of each device?
The AD9221ARSZ has a maximum sampling rate of 1.5 MSPS. The AD9220ARS-REEL has a maximum sampling rate of 10 MSPS. Designs requiring higher throughput should use the AD9220, while the AD9221 is suited to lower-speed, lower-power applications.
What is the resolution and architecture of these converters?
Both the AD9221ARSZ and AD9220ARS-REEL are 12-bit monolithic analog-to-digital converters using a pipelined switched-capacitor architecture with an on-chip sample-and-hold amplifier. They provide a parallel 12-bit CMOS-compatible output interface.
What are the power supply requirements for these ADCs?
Both devices operate from a single +5 V analog supply and a +3 V to +5 V digital supply, with separate analog and digital supply pins to support mixed-signal board design. Power consumption scales with sampling rate, so the AD9221ARSZ typically dissipates less power than the AD9220ARS-REEL at their respective maximum rates.
What input voltage range do the AD9221ARSZ and AD9220ARS-REEL support?
Both converters offer a flexible input range of 1 V p-p to 2 V p-p, configured via the reference and input span pins. An on-chip reference is provided, and an external reference may be used for applications requiring tighter gain accuracy or different full-scale ranges.
What is the difference between the ARSZ and AR-REEL ordering suffixes?
The "ARSZ" suffix on the AD9221ARSZ indicates a 28-lead SSOP package that is RoHS-compliant, supplied in tube form. The "ARS-REEL" suffix on the AD9220ARS-REEL indicates the same 28-lead SSOP package supplied on tape and reel for high-volume automated placement. The suffix difference reflects packaging and compliance status, not converter performance.
Can the AD9221ARSZ be used as a drop-in replacement for the AD9220ARS-REEL?
Because both share the same 28-lead SSOP pinout, the AD9221ARSZ can physically populate a board designed for the AD9220ARS-REEL. However, it is limited to 1.5 MSPS versus 10 MSPS, so it is only a functional substitute in applications that do not require the higher sampling rate. The system clock, timing margins, and power budget must be revalidated against the AD9221 datasheet before substitution.