Part A
AD9744ARU
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5441 PCS
- Package
- TSSOP-28
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9744ARU and AD9742ARZRL are both 14-bit high-speed TxDAC digital-to-analog converters from Analog Devices with matching resolution, update rate class, supply voltage, and current-output architecture, making them strong functional replacement candidates. However, they differ in package type and pinout, so PCB layout and footprint validation are required before substitution.
Resolution
High match
Output Type
High match
Package Type
Validation required
Supply Voltage
High match
Parts at a glance
Part B
AD9742ARZRL
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 787 PCS
- Package
- SOIC-28
- Series
- Data Acquisition - Digital to Analog Converters (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 | AD9742ARZRL | 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 signal fidelity and dynamic range. |
| 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 type ensures similar interface circuitry. |
| Data Interface | Parallel | Parallel | Both use a parallel interface, so the host controller connection scheme is compatible between the two parts. |
| Supply Voltage | 2.7V to 3.6V | 2.7V to 3.6V | Identical supply range means the same power rail can be used, simplifying board-level substitution. |
| Package / Case | 28-TSSOP | 28-SOIC | Different package footprints (TSSOP vs SOIC) require different PCB land patterns, so a board redesign is needed for direct substitution. |
| Mounting Type | Surface Mount | Surface Mount | Both are surface-mount devices, consistent with modern SMT assembly processes. |
| Operating Temperature | -40°C to 85°C | -40°C to 85°C | Matching industrial temperature ranges ensure both parts can be used in the same environmental conditions. |
| Update Rate (Sample Rate) | 210 MSPS | 210 MSPS | Identical maximum update rate means both can support the same signal bandwidth and clocking requirements. |
| INL / DNL Linearity | ±1.5 LSB INL (typ) | ±0.5 LSB INL (typ) | Linearity specifications affect distortion and accuracy; differing INL values mean the two parts are not equivalent in precision-critical applications. |
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 | AD9742ARZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| 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 AD9742ARZRL?
The AD9744ARU is a 14-bit, 210 MSPS TxDAC+ digital-to-analog converter in a 28-lead TSSOP package, while the AD9742ARZRL is a 12-bit, 210 MSPS TxDAC+ DAC in a 28-lead SOIC package. The primary differences are resolution (14-bit vs 12-bit) and package type (TSSOP vs SOIC).
Do the AD9744ARU and AD9742ARZRL have the same update rate?
Yes. Both devices are specified for a maximum update rate of 210 MSPS, making them suitable for similar high-speed signal synthesis applications.
Are the AD9744ARU and AD9742ARZRL pin-compatible?
No. The AD9744ARU uses a 28-lead TSSOP package, while the AD9742ARZRL uses a 28-lead SOIC package. The package footprints and PCB land patterns differ, so they are not drop-in replacements without layout changes.
Can the AD9742ARZRL be used as a substitute for the AD9744ARU in an existing design?
Substitution requires validation. The AD9742ARZRL offers 12-bit resolution versus 14-bit for the AD9744ARU, and the package differs (SOIC vs TSSOP). The designer must confirm that reduced resolution and the different footprint are acceptable for the target application.
What is the resolution difference and how does it affect performance?
The AD9744ARU provides 14-bit resolution, while the AD9742ARZRL provides 12-bit resolution. The higher resolution of the AD9744ARU yields finer output quantization and lower quantization noise, which can improve spectral performance in demanding signal synthesis applications.
Do both parts operate from the same supply voltage?
Yes. Both the AD9744ARU and AD9742ARZRL are specified for a single 3.3 V supply (3.0 V to 3.6 V range) and are members of the Analog Devices TxDAC+ family.
What is the difference in package thermal and assembly considerations?
The AD9744ARU is supplied in a 28-lead TSSOP, while the AD9742ARZRL is supplied in a 28-lead SOIC. The two packages have different thermal resistance and PCB land pattern requirements, so assembly and thermal design must be reviewed when switching between them.