Part A
AD9744ARUZRL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3270 Stückzahl
- Package
- TSSOP-28
- Series
- Data Acquisition von Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9744ARUZRL7 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 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 AD9744ARUZRL7 only where the lower sample rate and reduced SFDR still satisfy the application's signal-chain requirements. Designers should validate timing margin and spectral performance in the target circuit before committing to the replacement.
Resolution and Architecture
Validation required
Maximum Update Rate
Validation required
Package and Pin Configuration
High match
Dynamic Performance
Validation required
Parts at a glance
Part B
AD9740ARURL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4799 Stückzahl
- Package
- TSSOP-28
- Series
- Data Acquisition von Digital to Analog Converters (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 | AD9744ARUZRL7 | AD9740ARURL7 | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 10 bit | Resolution determines the number of discrete output levels; a 14-bit DAC provides 16x finer quantization than a 10-bit DAC, directly affecting signal fidelity and SFDR performance. |
| Update Rate (Max) | 210 MSPS | 210 MSPS | Maximum sample rate defines the highest signal bandwidth the DAC can synthesize; both parts share the same core speed, so throughput is equivalent. |
| Number of DAC Channels | 1 | 1 | Single-channel architecture means both devices are functionally interchangeable in single-DAC signal chains without channel-count mismatch. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Both provide unbuffered current outputs, so the same external I/V conversion and filtering network can be reused across designs. |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | Identical analog and digital supply ranges allow the same power rail design and decoupling scheme to be shared between the two parts. |
| Package / Case | 28-TSSOP | 28-TSSOP | Matching package and pinout enables drop-in board replacement without layout changes, which is critical for functional substitutability. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Equivalent industrial temperature ratings ensure both parts meet the same environmental qualification requirements in the target application. |
| Interface Type | Parallel CMOS | Parallel CMOS | A common parallel CMOS input interface means the same digital data source and timing can drive either device without rework. |
| Power Dissipation (Typical) | 135 mW | 135 mW | Similar power consumption keeps thermal budgets and supply sizing consistent when substituting one part for the other. |
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 | AD9744ARUZRL7 | AD9740ARURL7 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | TxDAC® | TxDAC® |
| Part Status | Active | Obsolete |
| Number of Bits | 14 | - |
| Number of D/A Converters | 1 | - |
| Settling Time | 11ns (Typ) | - |
| Output Type | Current - Unbuffered | - |
| Differential Output | Yes | - |
| Data Interface | Parallel | - |
| Reference Type | External, Internal | - |
| Voltage - Supply, Analog | 2.7V ~ 3.6V | - |
| Voltage - Supply, Digital | 2.7V ~ 3.6V | - |
| INL / DNL(LSB) | ±0.8, ±0.5 | - |
| Architecture | Current Source | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the key differences between the AD9744ARUZRL7 and the AD9740ARURL7?
The AD9744ARUZRL7 is a 14-bit, 210 MSPS TxDAC digital-to-analog converter, while the AD9740ARURL7 is a 10-bit, 210 MSPS TxDAC. Both are members of the same Analog Devices TxDAC family and share a 210 MSPS update rate, but they differ in resolution (14-bit vs. 10-bit), which affects dynamic range, SNR, and SFDR performance. The AD9744ARUZRL7 is supplied in a 28-lead TSSOP package (RU suffix), and the AD9740ARURL7 is supplied in a 28-lead LFCSP package (RU suffix with RL7 reel). Designers should confirm package, pinout, and resolution requirements against the respective datasheets before substitution.
Are the AD9744ARUZRL7 and AD9740ARURL7 pin-compatible?
No. The AD9744ARUZRL7 uses a 28-lead TSSOP (RU-28) package, while the AD9740ARURL7 uses a 28-lead LFCSP (RU-28) package. Although both are 28-lead devices in the same TxDAC family, the package types and PCB land patterns differ, so they are not drop-in replacements. Pin function assignments should be verified against each device's datasheet before any layout reuse.
Do both devices support the same maximum update rate?
Yes. Both the AD9744ARUZRL7 and the AD9740ARURL7 are specified for a maximum update rate of 210 MSPS, per Analog Devices TxDAC family documentation. The shared 210 MSPS rate makes them suitable for similar high-speed signal synthesis applications, though the resolution difference (14-bit vs. 10-bit) affects achievable dynamic performance.
What is the resolution difference and how does it affect performance?
The AD9744ARUZRL7 provides 14-bit resolution, while the AD9740ARURL7 provides 10-bit resolution. Higher resolution in the AD9744ARUZRL7 yields lower quantization noise and typically better SNR and SFDR, which is advantageous in applications requiring wide dynamic range such as communications transmitters and instrumentation. The AD9740ARURL7's 10-bit resolution may be sufficient for lower-cost, less demanding signal generation tasks.
Are both parts RoHS compliant and available in reel packaging?
Yes. Both the AD9744ARUZRL7 and AD9740ARURL7 carry the "Z" RoHS-compliant designation in their part numbers and are supplied in tape-and-reel packaging (RL7 suffix indicates 7-inch reel). Designers should confirm current RoHS status and packaging quantities on the Analog Devices product page or an authorized distributor such as DigiKey or Mouser before ordering.
Can the AD9740ARURL7 be used as a lower-cost substitute for the AD9744ARUZRL7?
Only if the application can tolerate reduced resolution (10-bit vs. 14-bit) and the different package (28-lead LFCSP vs. 28-lead TSSOP). Because the devices are not pin-compatible and differ in dynamic performance, a direct substitution requires PCB redesign and revalidation of SNR, SFDR, and output settling behavior against the system requirements. Consult both datasheets and, where needed, Analog Devices application support before substituting.
What are the typical applications for these TxDAC converters?
Both the AD9744ARUZRL7 and AD9740ARURL7 are general-purpose high-speed TxDAC converters suited to communications transmit paths, direct digital synthesis, instrumentation, and waveform generation. The 14-bit AD9744ARUZRL7 is preferred where higher dynamic range is needed, while the 10-bit AD9740ARURL7 suits cost-sensitive designs with relaxed resolution requirements. Application suitability should be validated against each device's datasheet specifications.