Part A
AD9240ASZRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2617 PCS
- Package
- QFP-44
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD9241AS is a functionally compatible replacement candidate for the AD9240ASZRL, sharing the same 14-bit resolution, 5 V supply architecture, and 44-lead MQFP package, though the lower 1.25 MSPS sample rate and reduced analog input bandwidth require validation against application timing and signal-frequency requirements.
Resolution
High match
Sample Rate
Validation required
Package Type
High match
Analog Input Bandwidth
Validation required
Parts at a glance
Part B
AD9241AS
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 142 PCS
- Package
- QFP-44
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | AD9240ASZRL | AD9241AS | Why it matters |
|---|---|---|---|
| Resolution | 14 bits | 14 bits | Both converters provide 14-bit resolution, so quantization noise floor and dynamic range are comparable for signal-chain budgeting. |
| Sampling Rate | 10 MSPS | 1.25 MSPS | The maximum conversion rate determines the input bandwidth and Nyquist zone the ADC can support; the AD9240 is roughly eight times faster. |
| Input Type | Differential | Differential | Differential inputs improve common-mode rejection and even-order distortion performance, and both parts share this architecture. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | A single 5 V rail simplifies power design and allows both parts to interface with the same analog front-end supply domain. |
| Power Consumption | ~285 mW | ~120 mW | Lower power dissipation affects thermal design and supply sizing; the AD9241 is significantly more power-efficient at its lower sample rate. |
| SNR | ~77.5 dB | ~77 dB | Signal-to-noise ratio sets the achievable dynamic range; the two parts are close, so noise performance is largely interchangeable. |
| SFDR | ~90 dBc | ~85 dBc | Spurious-free dynamic range indicates how well small signals survive in the presence of large interferers; the AD9240 offers better margin. |
| Package | 44-Lead MQFP | 44-Lead MQFP | Identical package and pinout enable drop-in board compatibility without layout changes. |
| Output Interface | Parallel CMOS | Parallel CMOS | A parallel CMOS output bus allows direct connection to standard digital controllers and FPGAs without serial deserialization. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Matching industrial temperature ranges mean both parts are suitable for the same environmental conditions and reliability requirements. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9240ASZRL | AD9241AS |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 14 | 14 |
| Sampling Rate(Per Second) | 10M | 1.25M |
| Data Interface | Parallel | Parallel |
| Number of A/D Converters | 1 | 7 |
| Operating Temperature | -55°C ~ 85°C | -40°C ~ 85°C |
| Number of Inputs | 1 | - |
| Input Type | Differential, Single Ended | - |
| Configuration | S/H-ADC | - |
| Ratio - S / H: ADC | 1:1 | - |
| Architecture | Pipelined | - |
| Reference Type | External, Internal | - |
| Voltage - Supply, Analog | 5V | - |
| Voltage - Supply, Digital | 5V | - |
Frequently asked questions
What are the key differences between the AD9240ASZRL and the AD9241AS?
The AD9240ASZRL is a 14-bit, 10 MSPS analog-to-digital converter, while the AD9241AS is a 14-bit, 1.25 MSPS ADC. Both are pin-compatible members of the same Analog Devices AD924x family and share a 44-lead MQFP package, but they differ in maximum sampling rate, power consumption, and dynamic performance specifications.
Are the AD9240ASZRL and AD9241AS pin-compatible?
Yes. Both devices are offered in the same 44-lead MQFP (MQFP-44) package and are designed as pin-compatible family members, allowing a common PCB footprint. However, the AD9240ASZRL supports a higher maximum sample rate, so the board design must be validated for the faster device's timing and power requirements.
What is the maximum sampling rate of each device?
The AD9240ASZRL has a maximum sampling rate of 10 MSPS. The AD9241AS has a maximum sampling rate of 1.25 MSPS. The AD9240ASZRL can therefore be used in applications requiring higher throughput, while the AD9241AS targets lower-speed, lower-power designs.
How do the power consumption figures compare?
The AD9240ASZRL typically dissipates about 285 mW at 10 MSPS. The AD9241AS typically dissipates about 60 mW at 1.25 MSPS. The lower power of the AD9241AS makes it preferable for power-sensitive designs operating at lower sample rates.
Do both converters use the same analog input and reference architecture?
Yes. Both are 14-bit pipelined ADCs with a differential analog input and an on-chip reference, and both operate from a single 5 V analog supply with a separate digital supply. This shared architecture supports similar signal-chain design across the two parts, subject to the different sampling-rate limits.
What are the SNR and SFDR specifications for these ADCs?
The AD9240ASZRL provides approximately 77.5 dB SNR and 90 dBc SFDR. The AD9241AS provides approximately 77.5 dB SNR and 90 dBc SFDR. Dynamic performance is comparable between the two devices, with the primary differentiator being maximum sample rate and power consumption.
Can the AD9241AS be used as a drop-in replacement for the AD9240ASZRL?
Not as a direct drop-in for full-speed operation. Because the AD9241AS is limited to 1.25 MSPS versus 10 MSPS for the AD9240ASZRL, it can only replace the faster part in designs that operate at or below 1.25 MSPS and whose timing, power, and performance budgets have been revalidated against the AD9241AS datasheet.
What package and temperature grade do these devices share?
Both the AD9240ASZRL and AD9241AS are supplied in the 44-lead MQFP package and are specified for the industrial temperature range of -40°C to +85°C. The "ASZ" and "AS" suffixes denote the package and temperature grade within the Analog Devices ordering nomenclature.