Part A
AD9744ARUZRL7
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 3270 個数
- Package
- TSSOP-28
- Series
- データ取得 - デジタル/アナログコンバータ (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9744ARUZRL7 and AD9742ARU are both 14-bit and 12-bit current-output DACs from the same Analog Devices TxDAC family, sharing a common TSSOP-28 footprint and parallel interface architecture. While the AD9744ARUZRL7 offers higher resolution and a faster update rate, the AD9742ARU is a lower-resolution, lower-speed variant that remains functionally interchangeable in many designs where 12-bit resolution and reduced bandwidth are acceptable. Engineers should validate dynamic performance and settling requirements before substituting in precision applications.
Resolution
Validation required
Update Rate
Validation required
Package Type
High match
Output Type
High match
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 | AD9742ARU | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 12 bit | Resolution determines the number of discrete output levels; a 14-bit DAC offers finer quantization and lower quantization noise 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 in single-path designs. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Current-output DACs require an external I/V stage; matching output type ensures the same analog front-end topology can be reused. |
| Supply Voltage | 2.7 V to 3.6 V | 2.7 V to 3.6 V | Compatible supply ranges allow the same power rail design to be used without rework. |
| Package / Case | 28-TSSOP | 28-TSSOP | Identical package and pinout enable drop-in board replacement without layout changes. |
| Mounting Type | Surface Mount | Surface Mount | Same mounting style ensures compatibility with the existing PCB assembly process. |
| Operating Temperature | -40°C to 85°C | -40°C to 85°C | Matching industrial temperature ranges ensure equivalent environmental robustness. |
| Data Interface | Parallel | Parallel | Same parallel interface allows the same digital controller and timing to drive either part. |
| Reference Type | External, Internal | External, Internal | Both support internal and external references, so reference biasing schemes remain interchangeable. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9744ARUZRL7 | AD9742ARU |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Analog Devices Inc. |
| Series | TxDAC® | TxDAC® |
| Part Status | Active | Active |
| Number of Bits | 14 | 12 |
| Number of D/A Converters | 1 | 1 |
| Settling Time | 11ns (Typ) | 11ns (Typ) |
| Output Type | Current - Unbuffered | Current - Unbuffered |
| Differential Output | Yes | Yes |
| Data Interface | Parallel | Parallel |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 2.7V ~ 3.6V | 2.7V ~ 3.6V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V | 2.7V ~ 3.6V |
| INL / DNL(LSB) | ±0.8, ±0.5 | ±0.5, ±0.4 |
| Architecture | Current Source | Current Source |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD9744ARUZRL7 and the AD9742ARU?
The AD9744ARUZRL7 is a 14-bit, 210 MSPS TxDAC+ digital-to-analog converter, while the AD9742ARU is a 12-bit, 210 MSPS TxDAC+ DAC. Both are members of the same Analog Devices TxDAC+ family and share a 28-lead TSSOP package, but the AD9744 offers 14-bit resolution versus the 12-bit resolution of the AD9742. The AD9744ARUZRL7 is supplied in tape-and-reel packaging (RL7 suffix), whereas the AD9742ARU is a tube/standard packaging variant.
Are the AD9744ARUZRL7 and AD9742ARU pin-compatible?
Yes. Both devices are offered in the same 28-lead TSSOP (RU-28) package and belong to the same TxDAC+ pin family, so they share a common pinout. This allows the AD9742ARU to be used as a drop-in 12-bit alternative to the AD9744ARUZRL7 on the same PCB footprint, provided the system timing and resolution requirements are met.
What is the maximum update rate and resolution of each device?
The AD9744ARUZRL7 provides 14-bit resolution with a maximum update rate of 210 MSPS. The AD9742ARU provides 12-bit resolution with a maximum update rate of 210 MSPS. Both devices support the same 210 MSPS conversion rate, so the primary trade-off between them is resolution versus cost.
Do both parts use the same supply voltage and output configuration?
Yes. Both the AD9744ARUZRL7 and AD9742ARU operate from a single 3.0 V to 3.6 V supply and provide a differential current output (typically 2 mA to 20 mA full-scale) intended for direct interfacing to differential transformers or op-amp circuits. They also share the same on-chip 1.2 V bandgap reference and control interface.
Can the AD9742ARU be used as a lower-cost substitute for the AD9744ARUZRL7?
In many designs the AD9742ARU can serve as a lower-resolution, lower-cost substitute for the AD9744ARUZRL7 because they are pin-compatible and share the same 210 MSPS update rate and supply requirements. However, the substitution reduces DAC resolution from 14 bits to 12 bits, which lowers SNR and SFDR performance, so the system's dynamic-range budget must be revalidated before substituting.
What are the packaging differences between the AD9744ARUZRL7 and the AD9742ARU?
Both parts use the 28-lead TSSOP package. The AD9744ARUZRL7 suffix "RL7" indicates tape-and-reel packaging in 7-inch reels, which is suited to automated high-volume assembly. The AD9742ARU is supplied in standard tube packaging. The package body and pinout are identical; only the shipping format differs.
Which device should be selected for higher dynamic performance?
The AD9744ARUZRL7 should be selected when higher dynamic performance is required, because its 14-bit resolution provides finer quantization and typically better SNR and SFDR than the 12-bit AD9742ARU at the same 210 MSPS update rate. The AD9742ARU is appropriate where 12-bit resolution is sufficient and cost or board space is the priority.