Part A
AD9744ARUZRL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3270 PCS
- Package
- TSSOP-28
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9744ARUZRL7 and AD9742ARURL7 are both 14-bit high-speed TxDAC digital-to-analog converters from Analog Devices in the same TSSOP-28 package family, sharing identical resolution, supply architecture, and digital interface characteristics. The AD9744ARUZRL7 offers a higher maximum update rate and wider analog output compliance range, while the AD9742ARURL7 provides a lower-power option with reduced dynamic performance headroom. The AD9744ARUZRL7 can serve as a functional replacement for the AD9742ARURL7 in most applications, provided the system timing margin and power budget are validated against the higher-speed device's requirements.
Resolution and DAC Architecture
High match
Package and Pinout
High match
Maximum Update Rate
Validation required
Power Consumption
Validation required
Parts at a glance
Part B
AD9742ARURL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4486 PCS
- Package
- TSSOP-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 | AD9744ARUZRL7 | AD9742ARURL7 | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 12 bit | Resolution determines the number of discrete output levels; a 14-bit DAC provides finer amplitude granularity than a 12-bit DAC, affecting signal fidelity and quantization noise. |
| Update Rate (Max) | 210 MSPS | 210 MSPS | Maximum update rate defines the highest sample clock the DAC can accept; both parts share the same rate, so bandwidth capability is equivalent. |
| Number of DAC Channels | 1 | 1 | Channel count confirms both are single-channel DACs, so board-level channel architecture is compatible. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Output topology determines the external interface circuitry required; matching current-steering unbuffered outputs allows reuse of the same analog front-end design. |
| Supply Voltage (Analog & Digital) | 2.7 V to 3.6 V | 2.7 V to 3.6 V | Supply range compatibility ensures the same power rails can be used without redesigning the power supply. |
| Package / Case | 28-TSSOP | 28-TSSOP | Identical package and pinout allow drop-in replacement on an existing PCB footprint. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Matching industrial temperature ranges confirm both parts are suitable for the same environmental conditions. |
| Data Interface | Parallel | Parallel | Interface type must match for the digital controller to drive the DAC without glue logic changes; both use a parallel CMOS interface. |
| INL (Integral Nonlinearity) | ±1.5 LSB (typ) | ±0.5 LSB (typ) | INL describes static accuracy; a lower INL indicates better linearity, which affects distortion performance in signal synthesis 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 | AD9744ARUZRL7 | AD9742ARURL7 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Series | TxDAC® | TxDAC® |
| Part Status | Active | Obsolete |
| 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 AD9742ARURL7?
The AD9744ARUZRL7 is a 14-bit, 210 MSPS TxDAC+ digital-to-analog converter, while the AD9742ARURL7 is a 12-bit, 210 MSPS TxDAC+ DAC. Both are pin-compatible members of the same Analog Devices TxDAC+ family and share the same 28-lead TSSOP package, but the AD9744 offers 14-bit resolution versus 12-bit resolution on the AD9742.
Are the AD9744ARUZRL7 and AD9742ARURL7 pin-compatible?
Yes. Both devices are offered in the same 28-lead TSSOP (RU-28) package and are designed as pin-compatible members of the Analog Devices TxDAC+ family, allowing a common PCB footprint across different resolution grades.
Do the AD9744ARUZRL7 and AD9742ARURL7 have the same maximum update rate?
Yes. Both the AD9744 and AD9742 are specified for a maximum update rate of 210 MSPS, so sample-rate capability is identical between the two parts.
What is the resolution difference and how does it affect performance?
The AD9744ARUZRL7 provides 14-bit resolution, whereas the AD9742ARURL7 provides 12-bit resolution. The higher resolution of the AD9744 yields finer amplitude quantization and lower quantization noise, which typically translates to better spurious-free dynamic range (SFDR) and signal-to-noise ratio (SNR) in demanding signal-synthesis applications.
Do both parts use the same digital input interface and supply requirements?
Yes. Both devices are members of the same TxDAC+ family and use a parallel CMOS-compatible digital input interface with a nominal 3.0 V to 3.6 V digital supply and a 3.0 V to 3.6 V analog supply, along with an on-chip 1.2 V reference, consistent with the AD9744/AD9742 datasheets.
Can the AD9742ARURL7 be used as a drop-in replacement for the AD9744ARUZRL7?
Because the two parts are pin-compatible and share the same package and update rate, the AD9742 can physically populate the same footprint. However, it provides only 12-bit resolution versus 14-bit on the AD9744, so it should only be substituted after confirming that the reduced resolution and associated dynamic-performance differences meet the system requirements.
What are the typical applications for these TxDAC+ converters?
Both the AD9744ARUZRL7 and AD9742ARURL7 are intended for high-speed signal synthesis applications such as communications transmit paths, base stations, instrumentation, and direct digital synthesis, where their 210 MSPS update rate and TxDAC+ architecture support wideband waveform generation.