Part A
AD9744ARU
ADI公司
- Lifecycle
- Active
- Stock
- 5441 件
- Package
- TSSOP-28
- Series
- 資料獲取-數模轉換器（DAC）
Replacement verdict
Compatible functional replacement candidate
The AD9744ARU and AD9740ARURL7 are both 10-bit high-speed TxDAC digital-to-analog converters from Analog Devices in the same TSSOP-28 package family, sharing core resolution, architecture, and supply requirements. However, they differ in maximum update rate and dynamic performance, so the AD9740ARURL7 can serve as a functional substitute for the AD9744ARU only where the lower sample rate and reduced SFDR still meet the system budget; designers should validate timing margin and spectral performance before committing to the swap.
Resolution
High match
Maximum Update Rate
Validation required
Dynamic Performance (SFDR)
Validation required
Package Type
High match
Parts at a glance
Part B
AD9740ARURL7
ADI公司
- Lifecycle
- Active
- Stock
- 4799 件
- Package
- TSSOP-28
- Series
- 資料獲取-數模轉換器（DAC）
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD9744ARU | AD9740ARURL7 | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 10 bit | Resolution determines the number of discrete output levels; a 14-bit DAC offers far finer quantization than a 10-bit DAC, directly affecting signal fidelity and SFDR. |
| Number of D/A Converters | 1 | 1 | Both are single-channel DACs, so channel count is not a differentiator for substitutability. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Both provide unbuffered current outputs, requiring an external op-amp or transformer for voltage conversion; matching output architecture simplifies circuit reuse. |
| Supply Voltage | 2.7 V to 3.6 V | 2.7 V to 3.6 V | Identical supply range means the same power rail design can be used for either part. |
| Package / Case | 28-TSSOP | 28-TSSOP | Same package and pin count allow drop-in PCB compatibility without layout changes. |
| Mounting Type | Surface Mount | Surface Mount | Both are surface-mount devices, consistent with modern SMT assembly processes. |
| Operating Temperature | -40°C to 85°C | -40°C to 85°C | Identical industrial temperature range ensures equivalent environmental robustness. |
| Data Interface | Parallel | Parallel | Both use a parallel input interface, so the same digital host and timing scheme can drive either device. |
| Update Rate (Max) | 210 MSPS | 210 MSPS | Matching maximum update rates mean both can serve the same signal bandwidth requirements. |
| Reference Type | External, Internal | External, Internal | Both support internal or external reference, giving design flexibility and equivalent biasing options. |
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 | AD9744ARU | AD9740ARURL7 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | TxDAC® | TxDAC® |
| Part Status | Obsolete | Obsolete |
Frequently asked questions
What are the key differences between the AD9744ARU and AD9740ARURL7?
The AD9744ARU is a 14-bit, 210 MSPS TxDAC digital-to-analog converter in a 28-lead TSSOP package, while the AD9740ARURL7 is a 10-bit, 210 MSPS TxDAC in a 28-lead TSSOP package supplied in tape-and-reel format. The primary difference is resolution (14-bit vs 10-bit); both share the same 210 MSPS update rate and TSSOP-28 footprint family.
Do the AD9744ARU and AD9740ARURL7 have the same pinout and package?
Both devices are offered in a 28-lead TSSOP package and belong to the same TxDAC pin-compatible family, allowing board-level interchangeability when resolution requirements permit. Designers should still verify the specific datasheet pin descriptions for each grade before substitution.
What is the maximum update rate of the AD9744ARU and AD9740ARURL7?
Both the AD9744ARU and AD9740ARURL7 are specified for a maximum update rate of 210 MSPS, making them suitable for high-speed DAC applications such as communications and instrumentation.
What resolution does each converter provide?
The AD9744ARU provides 14-bit resolution, offering finer quantization and lower quantization noise, while the AD9740ARURL7 provides 10-bit resolution. The 14-bit AD9744 is preferable where higher dynamic range and lower distortion are required.
What is the difference between the ARU and ARURL7 suffixes?
The ARU suffix denotes the 28-lead TSSOP package in tube or standard shipping form, while the ARURL7 suffix denotes the same TSSOP package supplied in tape-and-reel packaging (7-inch reel) for automated assembly. The silicon die and electrical specifications are unchanged by the packaging suffix.
Are the AD9744ARU and AD9740ARURL7 drop-in replacements for each other?
Because both are 28-lead TSSOP TxDAC devices with a 210 MSPS update rate, they can be considered for the same board location, but the resolution difference (14-bit vs 10-bit) means the system's digital interface width and performance budget must be revalidated. A 10-bit design cannot exploit 14-bit resolution without corresponding digital data path changes.
What supply voltage do the AD9744ARU and AD9740ARURL7 require?
Both devices operate from a single 3.0 V to 3.6 V analog supply and a 2.7 V to 3.6 V digital supply, consistent with the TxDAC family specifications. Designers should confirm the exact limits in the respective manufacturer datasheets.
Which part should be selected for higher dynamic performance?
The AD9744ARU, with its 14-bit resolution, provides lower quantization noise and better spurious-free dynamic range than the 10-bit AD9740ARURL7, making it the preferred choice for applications demanding high spectral purity, such as broadband communications transmitters.