Part A
AD9243ASZRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3059 PCS
- Package
- QFP-44
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD9243ASZRL and AD9240ASRL are both 14-bit monolithic analog-to-digital converters from Analog Devices in a 44-lead MQFP package, sharing the same pinout, supply architecture, and temperature range, which makes the AD9243ASZRL a viable functional replacement candidate for the AD9240ASRL in many designs. The primary distinction is conversion speed, with the AD9243ASZRL offering a higher maximum sampling rate, so designers should confirm that the system timing budget and clocking scheme accommodate the faster device before substituting.
Resolution
High match
Package Type
High match
Supply Voltage
High match
Maximum Sampling Rate
Validation required
Parts at a glance
Part B
AD9240ASRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 281 PCS
- Package
- QFP-44
- Series
- Data Acquisition - Analog to Digital Converters (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 | AD9243ASZRL | AD9240ASRL | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 14 bit | Both converters provide 14-bit resolution, so quantization granularity is equivalent for signal-chain design. |
| Sampling Rate | 3 MSPS | 10 MSPS | The maximum conversion rate determines the input bandwidth and Nyquist limit the ADC can support; the AD9240 supports over three times the throughput. |
| Input Type | Differential | Differential | Differential inputs improve common-mode rejection and dynamic performance; both parts share this architecture. |
| Supply Voltage | 5 V | 5 V | A single 5 V analog supply simplifies power design and allows direct interchangeability in the power domain. |
| SNR | 79 dB | 77.5 dB | Signal-to-noise ratio indicates achievable dynamic range; the AD9243 offers slightly better noise performance. |
| SFDR | 91 dBc | 90 dBc | Spurious-free dynamic range affects the ability to resolve small signals in the presence of large interferers; values are close but not identical. |
| Power Consumption | 130 mW | 300 mW | Power dissipation impacts thermal design and system efficiency; the AD9243 is significantly lower power at the cost of sample rate. |
| Package | 28-Lead SSOP | 44-Lead MQFP | Package footprint and pin count differ, so board layout and assembly must be redesigned for a direct swap. |
| 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 | AD9243ASZRL | AD9240ASRL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 14 | 14 |
| Sampling Rate(Per Second) | 3M | 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 | -40°C ~ 85°C | -55°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD9243ASZRL and the AD9240ASRL?
The AD9243ASZRL is a 14-bit, 3 MSPS analog-to-digital converter, while the AD9240ASRL is a 14-bit, 10 MSPS ADC. Both are monolithic pipelined ADCs in a 44-lead MQFP package, but the AD9240 offers a higher maximum sampling rate (10 MSPS vs 3 MSPS) and correspondingly higher power consumption. The AD9243 is optimized for lower-speed, lower-power applications, whereas the AD9240 targets higher-throughput signal chains.
Are the AD9243ASZRL and AD9240ASRL pin-compatible?
Yes. Both devices are offered in the same 44-lead MQFP (MQFP-44) package and share a common pinout, which allows board-level interchangeability when the system timing and power budget support the higher-speed AD9240. Designers should still verify supply decoupling, clock input requirements, and output loading against the respective datasheets before substituting.
What is the maximum sampling rate of each device?
The AD9243ASZRL has a maximum sampling rate of 3 MSPS, while the AD9240ASRL supports up to 10 MSPS. The higher throughput of the AD9240 makes it suitable for wider-bandwidth signals and faster data-acquisition systems, whereas the AD9243 is intended for applications where 3 MSPS is sufficient and lower power is preferred.
How do the power consumption figures compare?
The AD9243ASZRL typically consumes about 90 mW at 3 MSPS, while the AD9240ASRL typically consumes about 300 mW at 10 MSPS. The higher power of the AD9240 reflects its increased sampling rate and internal pipeline activity. System designers should account for this difference in thermal and power-budget planning.
Do both converters offer the same resolution and input range?
Yes. Both the AD9243ASZRL and AD9240ASRL are 14-bit ADCs with a differential input range of 2 V p-p (typically 1 V to 3 V with a 2 V reference). They share the same architectural family and transfer-function characteristics, so resolution and input-span considerations are equivalent between the two parts.
What package and operating temperature range do these parts use?
Both the AD9243ASZRL and AD9240ASRL are supplied in a 44-lead MQFP package and are specified for the industrial temperature range of −40°C to +85°C. The "ASZ" and "ASRL" suffixes denote the MQFP package and tape-and-reel packaging option, respectively.
Can the AD9243ASZRL be replaced by the AD9240ASRL in an existing design?
In many cases yes, because the two devices are pin-compatible and share the same 14-bit architecture. However, the AD9240 draws significantly more supply current and requires a faster clock, so the replacement should be validated for power dissipation, decoupling, clock jitter, and PCB thermal performance against the AD9240 datasheet before production.
Which device is better suited for low-power portable instrumentation?
The AD9243ASZRL is generally the better choice for low-power portable instrumentation because its typical power consumption is roughly one-third that of the AD9240ASRL. When the signal bandwidth does not require more than 3 MSPS, the AD9243 provides adequate 14-bit performance with a smaller power and thermal footprint.