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 AD9742ARURL7 are both 14-bit high-speed TxDAC digital-to-analog converters from Analog Devices in the same TSSOP-28 package family, sharing a common pin architecture and CMOS interface. The AD9744ARU offers a higher maximum update rate (210 MSPS versus 125 MSPS) and wider power-supply tolerance, making it a viable functional upgrade candidate for the AD9742ARURL7 in most designs, provided the system clock and output filtering are validated against the higher conversion rate and the slightly higher power consumption.
Resolution
High match
Package Type
High match
Maximum Update Rate
Validation required
Power Consumption
Validation required
Parts at a glance
Part B
AD9742ARURL7
ADI公司
- Lifecycle
- Active
- Stock
- 4486 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 | AD9742ARURL7 | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 12 bit | Resolution determines the number of discrete output levels; a 14-bit DAC offers finer quantization than a 12-bit DAC, affecting achievable SNR and signal fidelity. |
| 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. |
| Data Interface | Parallel | Parallel | A parallel interface dictates the digital pin count and timing; both being parallel means the host interface can remain unchanged. |
| Supply Voltage (Analog & Digital) | 2.7 V to 3.6 V | 2.7 V to 3.6 V | Matching supply ranges allow the same power rail design to be used for either part. |
| Package / Case | 28-TSSOP | 28-TSSOP | Identical package and pinout enable drop-in board replacement without layout changes. |
| Mounting Type | Surface Mount | Surface Mount | Both are surface-mount devices, consistent with modern PCB assembly processes. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | Equivalent temperature ratings ensure both parts meet the same environmental requirements. |
| Settling Time | 11 ns | 11 ns | Settling time affects maximum update rate and dynamic performance; identical values indicate comparable speed capability. |
| Update Rate | 210 MSPS | 210 MSPS | Maximum update rate determines the highest signal frequency that can be synthesized; matching rates support the same application bandwidth. |
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 | AD9742ARURL7 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Series | TxDAC® | TxDAC® |
| Part Status | Obsolete | Obsolete |
| 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 AD9742ARURL7?
The AD9744ARU is a 14-bit, 210 MSPS TxDAC digital-to-analog converter in a 28-lead TSSOP package, while the AD9742ARURL7 is a 12-bit, 210 MSPS TxDAC in a 28-lead TSSOP package supplied in tape-and-reel format. The primary differences are resolution (14-bit vs 12-bit) and packaging/packing format (tube vs 7-inch reel).
Are the AD9744ARU and AD9742ARURL7 pin-compatible?
Yes. Both devices are members of the AD974x TxDAC family and are offered in the same 28-lead TSSOP package with the same pinout, allowing board-level interchangeability when resolution requirements permit.
Do both parts support the same update rate?
Yes. Both the AD9744 and AD9742 are specified for a maximum update rate of 210 MSPS, so sample-rate performance is equivalent between the two devices.
What is the resolution difference and how does it affect performance?
The AD9744ARU provides 14-bit resolution, while the AD9742ARURL7 provides 12-bit resolution. The higher resolution of the AD9744 yields finer amplitude quantization and lower quantization noise, which can improve signal-to-noise ratio in demanding transmit signal chains.
What is the difference between the ARU and ARURL7 ordering suffixes?
The ARU suffix denotes the 28-lead TSSOP package in tube form, while ARURL7 denotes the same TSSOP package delivered in tape-and-reel format with a 7-inch reel. The silicon die and specifications are otherwise equivalent within each respective resolution grade.
Can the AD9742ARURL7 be used as a drop-in replacement for the AD9744ARU?
It can be used only if the system can tolerate a reduction from 14-bit to 12-bit resolution. Because the pinout and package are identical, no layout change is required, but the designer must verify that the lower resolution meets the target SNR and spectral performance requirements.
Do both devices share the same supply and reference requirements?
Yes. Both are members of the same TxDAC family and operate from a single 3.0 V to 3.6 V supply with an on-chip 1.2 V reference, so supply and reference design considerations are consistent between the two parts.