Part A
AD9744ARUZRL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3270 PCS
- Package
- TSSOP-28
- Series
- Acquisição de dados - Convertedores digitais para analógicos (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9744ARUZRL7 and AD9740ARU are both 10-bit high-speed TxDAC digital-to-analog converters from Analog Devices in the same TSSOP-28 package family, sharing a compatible parallel input interface and supply architecture. While the AD9744 offers a higher maximum update rate and somewhat wider dynamic performance headroom, the AD9740 can serve as a functional substitute in applications where the lower sample rate and reduced bandwidth remain within system requirements. Engineers should validate timing margins, output settling, and spectral performance against the target design before committing to the substitution.
Resolution
High match
Package Type
High match
Maximum Update Rate
Validation required
Supply Voltage
Validation required
Parts at a glance
Part B
AD9740ARU
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5120 PCS
- Package
- TSSOP-28
- Series
- Acquisição de dados - Convertedores digitais para analógicos (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 | AD9740ARU | 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 compatible for single-path signal chains. |
| Update Rate (Max) | 210 MSPS | 210 MSPS | Maximum sample rate defines the highest signal bandwidth the DAC can synthesize; matching rates support similar high-speed applications. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Current-output DACs require an external I/V stage; identical output topology means the same analog front-end can be reused. |
| Supply Voltage (Analog/Digital) | 3.0 V to 3.6 V | 3.0 V to 3.6 V | Matching supply ranges allow the same power rail design and decoupling to be used for either part. |
| Package / Case | 28-TSSOP | 28-TSSOP | Identical package and pinout enable drop-in board replacement without layout changes. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | Equivalent temperature ratings ensure both parts suit the same industrial-grade environments. |
| Data Interface | Parallel | Parallel | A parallel input interface means the same digital driver and timing scheme can feed either device. |
| INL / DNL (Typical) | ±1.5 LSB INL / ±0.5 LSB DNL | ±0.5 LSB INL / ±0.25 LSB DNL | Linearity specs affect accuracy; the 10-bit part shows tighter LSB linearity, but the 14-bit part delivers finer absolute resolution. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9744ARUZRL7 | AD9740ARU |
|---|---|---|
| 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 AD9740ARU?
The AD9744ARUZRL7 is a 14-bit, 210 MSPS TxDAC digital-to-analog converter, while the AD9740ARU is a 10-bit, 210 MSPS TxDAC. Both are members of Analog Devices' TxDAC family and share the same 28-lead TSSOP package and pinout, but they differ in resolution (14-bit vs. 10-bit) and therefore in dynamic performance specifications such as SNR and SFDR.
Are the AD9744ARUZRL7 and AD9740ARU pin-compatible?
Yes. Both devices are offered in the same 28-lead TSSOP (RU-28) package with an identical pin configuration, which allows them to share a common PCB footprint. However, pin compatibility does not guarantee functional equivalence; the resolution difference must be considered in the design.
What is the maximum update rate of these two DACs?
Both the AD9744ARUZRL7 and the AD9740ARU are specified for a maximum update rate of 210 MSPS, making them suitable for high-speed signal synthesis, communications, and instrumentation applications.
What is the resolution difference and how does it affect performance?
The AD9744ARUZRL7 provides 14-bit resolution, whereas the AD9740ARU provides 10-bit resolution. The higher resolution of the AD9744 yields lower quantization noise and typically better SNR and SFDR performance, which is advantageous in applications requiring wide dynamic range.
Do both parts support the same digital input interface?
Yes. Both devices use a parallel CMOS-compatible digital input interface and operate from a single 2.7 V to 3.6 V supply for the digital section, with a separate analog supply. The input data format and timing are consistent across the TxDAC family.
What are the typical power consumption figures for these DACs?
Both the AD9744ARUZRL7 and AD9740ARU are low-power TxDAC devices. At 3.3 V and 210 MSPS, the AD9744 typically consumes approximately 135 mW, while the AD9740 typically consumes approximately 120 mW. Exact values should be confirmed against the respective datasheets for the specific operating conditions.
Can the AD9740ARU be used as a drop-in replacement for the AD9744ARUZRL7?
Because both share the same package and pinout, the AD9740ARU can physically populate the same footprint. However, it is not a functional drop-in replacement: the reduced 10-bit resolution changes the transfer function and dynamic performance. The system must be revalidated to confirm that 10-bit resolution meets the application's accuracy and spectral requirements.
What are the typical applications for these TxDAC converters?
Both devices are intended for communications systems, base stations, set-top boxes, digital radio, and instrumentation where high-speed digital-to-analog conversion is required. The AD9744ARUZRL7 is preferred where higher resolution and dynamic range are needed, while the AD9740ARU suits cost-sensitive designs with moderate resolution requirements.