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 AD9742ARU share the same 14-bit current-output DAC architecture, TSSOP-28 package, and pin-compatible interface, making the AD9744ARU a viable functional replacement candidate for the AD9742ARU in many designs. However, the higher sample rate and wider input bandwidth of the AD9744ARU require validation of the digital interface timing, clock source, and reconstruction filter against the target application requirements before substitution.
Resolution
High match
Package Type
High match
Sample Rate
Validation required
Output Interface
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 | AD9742ARU | Why it matters |
|---|---|---|---|
| Resolution | 14 bits | 12 bits | Resolution determines the number of discrete output levels; a 14-bit DAC provides finer amplitude granularity than a 12-bit DAC, affecting signal fidelity and quantization noise. |
| Update Rate (Max) | 210 MSPS | 210 MSPS | Maximum sample rate defines the highest clock frequency at which the DAC can reliably convert data, directly limiting the achievable output bandwidth. |
| Number of DAC Channels | 1 | 1 | Channel count indicates whether the device is single or multi-channel; both are single-channel, so board layout and interface requirements are similar. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Output type determines the external circuitry needed; unbuffered current outputs require an external op-amp or transformer for voltage conversion. |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | Supply voltage range must match the system power rail; identical ranges mean both parts can share the same power supply design. |
| Package / Case | 28-TSSOP | 28-TSSOP | Package and footprint compatibility is essential for drop-in substitution; identical packages allow the same PCB land pattern to be used. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Temperature range defines the environments in which the part is guaranteed to meet specifications; matching ranges ensure equivalent thermal robustness. |
| Data Interface | Parallel CMOS | Parallel CMOS | Interface type determines how the DAC connects to the digital source; identical parallel CMOS interfaces allow the same FPGA or DSP driver to be reused. |
| INL (Integral Nonlinearity) | ±1.5 LSB (typ) | ±0.5 LSB (typ) | INL measures deviation from an ideal transfer function; lower INL yields better static accuracy, which can affect overall system linearity and distortion performance. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9744ARU | AD9742ARU |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Analog Devices Inc. |
| Series | TxDAC® | TxDAC® |
| Part Status | Obsolete | Active |
| Number of Bits | - | 12 |
| 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) | - | ±0.5, ±0.4 |
| Architecture | - | Current Source |
| Operating Temperature | - | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD9744ARU and AD9742ARU?
The AD9744ARU is a 14-bit, 210 MSPS TxDAC digital-to-analog converter, while the AD9742ARU is a 12-bit, 210 MSPS TxDAC. Both are members of the same pin-compatible TxDAC family from Analog Devices, but the AD9744 offers 14-bit resolution versus the 12-bit resolution of the AD9742, providing higher dynamic range and lower quantization noise for the AD9744.
Are the AD9744ARU and AD9742ARU pin-compatible?
Yes. Both devices are offered in the same 28-lead TSSOP (RU) package and belong to the same TxDAC family, sharing a common pinout. This allows the AD9744ARU and AD9742ARU to be used on the same PCB layout, with the primary difference being resolution and associated performance specifications.
What is the maximum update rate of the AD9744ARU and AD9742ARU?
Both the AD9744ARU and AD9742ARU are specified for a maximum update rate of 210 MSPS, making them suitable for high-speed DAC applications such as communications, instrumentation, and waveform generation.
What is the resolution difference and how does it affect performance?
The AD9744ARU provides 14-bit resolution, while the AD9742ARU provides 12-bit resolution. The higher resolution of the AD9744 yields finer output quantization (16384 levels versus 4096 levels) and typically better signal-to-noise ratio and spurious-free dynamic range, which is beneficial in demanding signal synthesis applications.
Do both devices use the same supply voltage and output configuration?
Yes. Both the AD9744ARU and AD9742ARU operate from a single 3.0 V to 3.6 V supply and provide differential current outputs. They share the same digital input interface and reference architecture, so the surrounding circuit design is largely identical between the two parts.
Can the AD9742ARU be replaced by the AD9744ARU in an existing design?
Because the two devices are pin-compatible and share the same package and supply requirements, the AD9744ARU can generally be used in place of the AD9742ARU. However, the designer should verify that the higher 14-bit resolution and any differences in timing or performance specifications are acceptable for the target application, and confirm against the respective Analog Devices datasheets.
Which device should be selected for higher dynamic performance?
The AD9744ARU should be selected when higher dynamic performance is required, since its 14-bit resolution provides lower quantization noise and improved SNR/SFDR compared with the 12-bit AD9742ARU. The AD9742ARU may be sufficient where 12-bit resolution meets the system requirements and cost or simplicity is prioritized.