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 AD9740ARU are both 14-bit and 10-bit high-speed TxDAC converters from Analog Devices in the same 28-lead TSSOP package, sharing an identical pinout, supply architecture, and digital interface. The AD9744ARU offers higher resolution and a faster maximum update rate, making it a viable functional upgrade for the AD9740ARU in most designs, provided the system timing margin and data bus width are validated against the higher-performance device.
Resolution
High match
Package Type
High match
Digital Interface
High match
Maximum Update Rate
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 | AD9744ARU | AD9740ARU | Why it matters |
|---|---|---|---|
| Resolution | 14 bits | 10 bits | 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. |
| 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 timing-critical designs can often interchange them. |
| SFDR at fOUT = 10 MHz | 84 dBc | 79 dBc | Spurious-free dynamic range indicates spectral purity; the higher-resolution AD9744 delivers better SFDR, which matters for communication and instrumentation applications. |
| INL (Integral Nonlinearity) | ±1.5 LSB | ±0.5 LSB | INL measures deviation from an ideal transfer function; expressed in LSB, the absolute error differs because the LSB size differs between the two resolutions. |
| DNL (Differential Nonlinearity) | ±1.0 LSB | ±0.5 LSB | DNL indicates step-size uniformity and guarantees monotonicity; tighter DNL reduces distortion and missing-code risk in closed-loop or control applications. |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | Both devices operate from the same single 3.3 V nominal supply, so power-rail design and decoupling requirements are compatible. |
| Power Consumption | 135 mW | 135 mW | Identical power dissipation means thermal budgets and supply sizing do not need to change when substituting one part for the other. |
| Output Type | Current output (differential) | Current output (differential) | Both provide differential current outputs, so the same external transformer or op-amp interface network can typically be reused. |
| Package | 28-lead TSSOP | 28-lead TSSOP | Matching package and pinout allow 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 | Identical industrial temperature ratings ensure both parts meet the same environmental requirements in the target application. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9744ARU | AD9740ARU |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | TxDAC® | TxDAC® |
| Part Status | Obsolete | Obsolete |
Frequently asked questions
What are the key differences between the AD9744ARU and AD9740ARU?
The AD9744ARU 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 the same pin-compatible TxDAC family from Analog Devices, sharing the same 28-lead TSSOP (RU) package and 210 MSPS update rate, but they differ in resolution (14-bit vs 10-bit) and therefore in dynamic performance specifications such as SNR and SFDR.
Are the AD9744ARU and AD9740ARU pin-compatible?
Yes. Both devices are offered in the same 28-lead TSSOP (RU) package and belong to the same TxDAC pin-compatible family, allowing a common PCB footprint. However, because resolution differs, designers must verify that the system's data bus width and performance requirements match the selected device.
What is the maximum update rate of these DACs?
Both the AD9744ARU and AD9740ARU are specified for a maximum update rate of 210 MSPS, making them suitable for high-speed communications, instrumentation, and signal synthesis applications.
What is the resolution of each device?
The AD9744ARU provides 14-bit resolution, offering finer quantization and lower quantization noise, while the AD9740ARU provides 10-bit resolution. The higher resolution of the AD9744ARU generally yields better SNR and SFDR performance for demanding signal-chain applications.
Do both parts use the same digital input interface?
Yes. Both devices use a parallel CMOS-compatible digital input interface with the same pinout in the 28-lead TSSOP package. The AD9744ARU accepts 14-bit input words, whereas the AD9740ARU accepts 10-bit input words, so the driving logic and data bus width must be matched accordingly.
What is the supply voltage and power consumption of these DACs?
Both the AD9744ARU and AD9740ARU operate from a single 3.0 V to 3.6 V supply and are specified for low power consumption typical of the TxDAC family. For exact power figures, consult the respective Analog Devices datasheets, as values depend on update rate and operating conditions.
Can the AD9740ARU be used as a drop-in replacement for the AD9744ARU?
Not directly as a performance-equivalent replacement. Although the devices are pin-compatible in the same 28-lead TSSOP package, the AD9740ARU offers only 10-bit resolution versus 14-bit on the AD9744ARU, which reduces SNR and SFDR. A substitution is only acceptable after validating that the lower resolution and resulting dynamic performance meet the system requirements.
What are typical applications for the AD9744ARU and AD9740ARU?
Both parts are TxDAC transmit-path converters suited to communications systems, base stations, cable modems, instrumentation, and direct digital synthesis. The AD9744ARU's 14-bit resolution is preferred where higher dynamic range is required, while the AD9740ARU's 10-bit resolution suits cost-sensitive designs with relaxed performance requirements.