Part A
AD9240AS
ADI公司
- Lifecycle
- Active
- Stock
- 9325 件
- Package
- QFP-44
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The AD9240ASZ and AD9240AS are functionally equivalent 14-bit, 10 MSPS analog-to-digital converters sharing the same core architecture, resolution, and sampling rate, with the ASZ suffix denoting a RoHS-compliant package variant of the same device. Designers can treat the AD9240ASZ as a direct functional substitute for the AD9240AS in existing 14-bit ADC applications, provided the lead-free package finish and compliance requirements are acceptable for the target assembly process.
Resolution
High match
Sampling Rate
High match
Package Type
High match
RoHS Compliance
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 | AD9240ASZ | AD9240AS | Why it matters |
|---|---|---|---|
| Resolution | 14 bits | 14 bits | Determines the quantization granularity and achievable SNR; identical resolution means equivalent nominal dynamic performance. |
| Sampling Rate | 10 MSPS | 10 MSPS | Sets the maximum input bandwidth and conversion throughput; matching rates allow direct functional substitution in the same signal chain. |
| Input Type | Differential | Differential | Defines the analog front-end drive requirements; both being differential means the same driver/transformer interface can be reused. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Must match the board power rail; identical 5 V single-supply operation ensures power compatibility without redesign. |
| Output Interface | Parallel CMOS | Parallel CMOS | Determines the digital host interface and timing; identical parallel CMOS output allows the same FPGA/controller connection. |
| Package / Mounting | 44-Lead MQFP | 44-Lead MQFP | Affects PCB footprint and assembly; the same MQFP package means the parts are drop-in compatible on an existing layout. |
| RoHS / Lead-Free Status | RoHS compliant (lead-free, Z suffix) | Non-RoHS (leaded) | The "Z" suffix denotes lead-free/RoHS compliance; this affects regulatory compliance and solder process selection, though electrical function is equivalent. |
| Part Status / Lifecycle | Active (recommended for new designs) | Obsolete / not recommended for new designs | Lifecycle status impacts long-term availability and sourcing; the leaded version is being phased out in favor of the RoHS "Z" variant. |
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 | AD9240AS | AD9240ASZ |
|---|---|---|
| Supplier | Analog Devices Inc.,Rochester Electronics, LLC | - |
| Part Status | Obsolete | Active |
| Number of Bits | 14 | 14 |
| Sampling Rate(Per Second) | 10M | 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 | 5V | 5V |
| Operating Temperature | -55°C ~ 85°C | -55°C ~ 85°C |
Frequently asked questions
What is the difference between the AD9240ASZ and the AD9240AS?
The AD9240ASZ and AD9240AS are both 14-bit, 10 MSPS analog-to-digital converters from Analog Devices. The primary difference is the package and lead finish: the AD9240ASZ is supplied in a lead-free (Pb-free) 44-lead MQFP package compliant with RoHS, while the AD9240AS is the older leaded (SnPb) version of the same MQFP package. Both share the same core die and specified performance.
Are the AD9240ASZ and AD9240AS functionally interchangeable?
Yes. Both parts are the same 14-bit, 10 MSPS ADC with identical pinout, resolution, sampling rate, and specified AC/DC performance. The only difference is the package lead finish (Pb-free vs. leaded), so they are functionally interchangeable in the same PCB footprint.
What are the key specifications of the AD9240?
The AD9240 is a 14-bit, 10 MSPS pipelined ADC with a 5 V analog supply and 3 V to 5 V digital supply. It offers a 70 dB SNR and 85 dBc SFDR at 10 MSPS, an on-chip sample-and-hold amplifier, and a differential or single-ended input range of 1 V p-p to 2 V p-p. It is specified over the industrial temperature range of -40°C to +85°C.
Is the AD9240ASZ RoHS compliant while the AD9240AS is not?
Yes. The "Z" suffix in the AD9240ASZ denotes a lead-free (Pb-free) package that is RoHS compliant. The AD9240AS uses a leaded (SnPb) lead finish and is not RoHS compliant. Designs requiring RoHS compliance should use the AD9240ASZ.
Can the AD9240ASZ be used as a drop-in replacement for the AD9240AS?
Yes, the AD9240ASZ is a drop-in replacement for the AD9240AS. Both use the same 44-lead MQFP package with identical pinout and land pattern, so no PCB redesign is required. The only consideration is the lead-free solder process required for the Z version.
What package do the AD9240ASZ and AD9240AS use?
Both parts are housed in a 44-lead MQFP (Metric Quad Flat Package). The AD9240ASZ uses a Pb-free lead finish, while the AD9240AS uses a standard SnPb lead finish. Package dimensions and pin assignments are identical between the two versions.
What are the power supply requirements for the AD9240ASZ and AD9240AS?
Both devices require a 5 V analog supply (AVDD) and a separate digital supply (DVDD) that can range from 3 V to 5 V. The on-chip reference and sample-and-hold simplify system design. Power consumption is typically 300 mW at 10 MSPS.
Which version should be selected for a new design?
For new designs, the AD9240ASZ is recommended because it is RoHS compliant and lead-free, meeting current environmental and regulatory requirements. The AD9240AS (leaded) is generally suitable only for legacy designs or where SnPb soldering processes are still mandated.