Part A
AD9744ARUZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6063 PCS
- Package
- TSSOP-28
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9744ARUZ and AD9742ARU are both 14-bit and 12-bit high-speed TxDAC digital-to-analog converters from Analog Devices in the same 28-lead TSSOP package, sharing an identical pinout and parallel input interface. While the AD9744ARUZ offers higher resolution and a faster update rate, the AD9742ARU can serve as a functional substitute in applications where 12-bit resolution and a lower sample rate are acceptable, subject to validation of dynamic performance requirements.
Resolution
Validation required
Update Rate
Validation required
Package Type
High match
Input Interface
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 | AD9744ARUZ | 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. |
| Update Rate (Max) | 210 MSPS | 210 MSPS | Maximum sample rate defines the bandwidth of signals the DAC can synthesize; identical rates mean similar high-frequency capability. |
| 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 (Analog/Digital) | 3.0 V to 3.6 V | 3.0 V to 3.6 V | Supply voltage compatibility ensures the part can drop into the same power rail design without level shifting or regulator changes. |
| Package / Case | 28-TSSOP | 28-TSSOP | Identical package and pinout allow direct board-level substitution without layout changes. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Matching temperature ratings confirm both parts are suitable for the same industrial-grade environments. |
| Data Interface | Parallel | Parallel | A parallel interface with the same bus width and timing simplifies digital-side redesign when swapping parts. |
| INL / DNL (Typical) | ±1.5 LSB INL / ±0.5 LSB DNL | ±0.5 LSB INL / ±0.3 LSB DNL | Linearity errors affect distortion and accuracy; the 14-bit part specifies larger LSB-referenced INL/DNL, so absolute linearity performance differs between the two. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9744ARUZ | 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 AD9744ARUZ and AD9742ARU?
The AD9744ARUZ is a 14-bit, 210 MSPS TxDAC digital-to-analog converter, while the AD9742ARU is a 12-bit, 210 MSPS TxDAC. Both are pin-compatible members of the same TxDAC family in a 28-lead TSSOP package, but they differ in resolution (14-bit vs 12-bit) and therefore in INL/DNL, SNR, and SFDR performance specifications.
Are the AD9744ARUZ and AD9742ARU pin-compatible?
Yes. Both devices are offered in the same 28-lead TSSOP (RU) package and share the same pinout as members of the AD974x TxDAC family, allowing a common PCB footprint. However, because resolution differs, the digital input bus width and the effective data interface must be validated for the target design.
What is the maximum update rate of these DACs?
Both the AD9744ARUZ and AD9742ARU 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 difference and how does it affect performance?
The AD9744ARUZ provides 14-bit resolution, whereas the AD9742ARU provides 12-bit resolution. The higher resolution of the AD9744ARUZ yields finer quantization, lower quantization noise, and typically better SNR and SFDR performance, which matters in demanding spectral applications.
Do both parts support the same digital input interface?
Both devices use a parallel CMOS-compatible digital input interface with a current-output DAC core. Because the AD9744ARUZ accepts 14-bit data and the AD9742ARU accepts 12-bit data, the number of active data input pins and the applied data word width differ, so the driving logic and PCB routing must be adapted accordingly.
Can the AD9742ARU be used as a drop-in replacement for the AD9744ARUZ?
Not as a direct functional drop-in. Although the package and pinout are compatible, the AD9742ARU is 12-bit versus 14-bit for the AD9744ARUZ, so system resolution, SNR, and SFDR requirements must be re-validated against the manufacturer datasheets before substitution.
What are the typical applications for these TxDAC converters?
Both the AD9744ARUZ and AD9742ARU are intended for high-speed signal synthesis applications such as communications transmit paths, broadband infrastructure, instrumentation, and arbitrary waveform generation, where a parallel-input current-output DAC at up to 210 MSPS is required.