Part A
AD9744ARUZ
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 AD9742ARZRL are both 14-bit high-speed TxDAC digital-to-analog converters from Analog Devices sharing the same resolution, update rate class, and 28-lead TSSOP footprint, making the AD9744ARUZ a viable functional replacement candidate for the AD9742ARZRL in many designs. However, because the two parts differ in their spurious-free dynamic range and power consumption characteristics, engineers should validate SFDR performance and thermal margins against the target application before committing to a drop-in substitution.
Resolution
High match
Package Type
High match
Dynamic Performance (SFDR)
Validation required
Power Consumption
Validation required
Parts at a glance
Part B
AD9742ARZRL
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 | AD9744ARUZ | AD9742ARZRL | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 12 bit | Resolution determines the number of discrete output levels; a 14-bit DAC provides 4x finer quantization than a 12-bit DAC, directly affecting signal fidelity and SFDR performance. |
| Update Rate (Max) | 210 MSPS | 210 MSPS | Maximum sample rate defines the highest signal bandwidth the DAC can synthesize; both parts share the same core speed, so bandwidth capability is equivalent. |
| Number of DAC Channels | 1 | 1 | Channel count determines how many independent analog outputs are available; both are single-channel, so they are interchangeable in single-path architectures. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Output topology dictates the external interface circuitry required; both provide unbuffered current outputs, so the same output network can be reused. |
| Supply Voltage | 2.7 V to 3.6 V | 2.7 V to 3.6 V | Supply range must match the system rail; identical ranges mean both parts can operate from the same 3.3 V rail without redesign. |
| Package / Case | 28-TSSOP | 28-SOIC | Package footprint and thermal characteristics differ; a board layout designed for one package cannot directly accept the other without a footprint change. |
| 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; identical industrial ranges allow use in the same applications. |
| Interface Type | Parallel | Parallel | Digital interface compatibility determines whether the host FPGA/DSP can drive the DAC without glue logic; both use a parallel interface, simplifying substitution. |
| INL (Integral Nonlinearity) | ±1.5 LSB typ | ±0.5 LSB typ | INL measures static accuracy deviation from an ideal transfer function; the 12-bit part specifies tighter LSB linearity, which can affect DC precision in the application. |
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 | AD9744ARUZ | AD9742ARZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| 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 AD9742ARZRL?
The AD9744ARUZ 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 in a 28-lead SOIC package. Both share the same 210 MSPS update rate and pin-compatible TxDAC architecture, but differ in resolution (14-bit vs 12-bit) and package type (TSSOP vs SOIC).
Are the AD9744ARUZ and AD9742ARZRL pin-compatible?
No. The AD9744ARUZ uses a 28-lead TSSOP package (RU suffix), while the AD9742ARZRL uses a 28-lead SOIC package (R suffix). Although both are 28-lead TxDAC devices with similar pin functions, the different package footprints and land patterns mean they are not drop-in replacements on the same PCB without layout changes.
What is the maximum update rate of both devices?
Both the AD9744ARUZ and AD9742ARZRL are specified for a maximum update rate of 210 MSPS, making them suitable for high-speed DAC applications such as communications and instrumentation.
What resolution does each DAC provide?
The AD9744ARUZ provides 14-bit resolution, offering finer quantization and lower quantization noise than the AD9742ARZRL, which provides 12-bit resolution. The choice depends on the required dynamic range and accuracy of the target application.
Do both parts support the same supply voltage and output configuration?
Yes. Both devices are members of the TxDAC family and operate from a single 3.0 V to 3.6 V supply with a nominal 3.3 V rail, providing complementary current outputs. They share the same digital input interface and output architecture, differing primarily in resolution and package.
Can the AD9742ARZRL be used as a lower-cost alternative to the AD9744ARUZ?
It can be considered where 12-bit resolution is sufficient, but it is not a direct drop-in replacement because of the different package (SOIC vs TSSOP). The design must be validated for resolution requirements, PCB footprint, and dynamic performance before substitution.
What are the package and ordering differences between the two part numbers?
The AD9744ARUZ is supplied in a 28-lead TSSOP (RU suffix) in tube or tray quantities, while the AD9742ARZRL is supplied in a 28-lead SOIC (R suffix) in tape-and-reel packaging (RL suffix). The suffix differences indicate package type and shipping format, which affect PCB layout and assembly handling.