Part A
AD9751ASTZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3339 PCS
- Package
- LQFP-48
- Series
- Acquisição de dados - Convertedores digitais para analógicos (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9753ASTZRL is a viable functional replacement candidate for the AD9751ASTZ, sharing the same 10-bit resolution, 300 MSPS update rate, TSSOP-48 package, and current-steering DAC architecture. Designers should validate the higher SFDR specification and confirm the on-chip reference and interface timing against the original AD9751ASTZ requirements before committing to production.
Resolution
High match
Update Rate
High match
Package Type
High match
Dynamic Performance
Validation required
Parts at a glance
Part B
AD9753ASTZRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8876 PCS
- Package
- LQFP-48
- Series
- Acquisição de dados - Convertedores digitais para analógicos (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 | AD9751ASTZ | AD9753ASTZRL | Why it matters |
|---|---|---|---|
| Resolution | 10 bit | 12 bit | Higher resolution provides finer output quantization and lower quantization noise, directly affecting signal fidelity in the DAC output. |
| Number of DAC Channels | 1 | 1 | Both are single-channel DACs, so channel count is not a differentiator for substitutability. |
| Sampling Rate (Max) | 300 MSPS | 300 MSPS | Maximum update rate determines the highest signal bandwidth the DAC can synthesize; identical rates support similar high-speed applications. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Output architecture affects external interface circuitry; matching current-steering outputs allows similar analog front-end design. |
| Supply Voltage (Analog/Digital) | 3.0 V to 3.6 V | 3.0 V to 3.6 V | Compatible supply rails allow the parts to be used in the same power domain without redesigning the power supply. |
| Package / Case | 48-LQFP | 48-LQFP | Identical package and footprint enable drop-in board replacement without layout changes. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Matching industrial temperature ranges ensure equivalent environmental robustness for the target application. |
| Interface Type | Parallel | Parallel | Same digital interface simplifies FPGA/ASIC connection and firmware reuse when substituting parts. |
| Mounting Type | Surface Mount | Surface Mount | Consistent mounting style supports the same assembly process and PCB design. |
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 | AD9751ASTZ | AD9753ASTZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Series | TxDAC+® | TxDAC+® |
| Part Status | Active | Active |
| Number of Bits | 10 | 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 | 3V ~ 3.6V | 3V ~ 3.6V |
| Voltage - Supply, Digital | 3V ~ 3.6V | 3V ~ 3.6V |
| INL / DNL(LSB) | ±0.3, ±0.2 | ±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 AD9751ASTZ and AD9753ASTZRL?
Both are dual-channel, 10-bit high-speed DACs from Analog Devices in a 48-lead LQFP package. The AD9751ASTZ is specified for a 300 MSPS update rate, while the AD9753ASTZRL is specified for a 125 MSPS update rate. The AD9753ASTZRL is supplied in tape-and-reel packaging (RL suffix), whereas the AD9751ASTZ is a tray-style orderable part number. Pinout and package footprint are the same LQFP-48, but the maximum sample rate and packaging differ.
Can the AD9751ASTZ and AD9753ASTZRL be used interchangeably in an existing design?
They share the same 48-lead LQFP package and pinout, but they are not drop-in equivalents for all designs. The AD9751ASTZ supports up to 300 MSPS, while the AD9753ASTZRL is rated to 125 MSPS. A design operating above 125 MSPS cannot use the AD9753ASTZRL. Substitution also requires verifying supply current, output compliance range, and timing margins against the respective datasheets.
What is the resolution and architecture of these DACs?
Both the AD9751ASTZ and AD9753ASTZRL are 10-bit dual-channel digital-to-analog converters using a current-steering architecture with segmented current sources. They integrate an on-chip 1.2 V reference and provide differential current outputs, making them suited for direct digital synthesis, quadrature modulation, and high-speed signal generation.
What are the maximum update rates of the AD9751ASTZ and AD9753ASTZRL?
The AD9751ASTZ is specified for a maximum update rate of 300 MSPS. The AD9753ASTZRL is specified for a maximum update rate of 125 MSPS. Designs must not exceed the rated maximum for the selected part, as dynamic performance (SFDR, SNR) degrades beyond the specified rate.
Do both parts use the same power supply and reference configuration?
Yes. Both devices operate from a single 3.0 V to 3.6 V analog and digital supply and include an internal 1.2 V bandgap reference. An external reference can also be applied. The nominal full-scale output current is set by an external resistor, and both parts provide the same reference and control pin functions on the shared LQFP-48 pinout.
What package and pin count do the AD9751ASTZ and AD9753ASTZRL use?
Both parts are offered in a 48-lead LQFP (low-profile quad flat package). The "ASTZ" suffix indicates the LQFP package and RoHS-compliant lead finish. Because the package and pinout are identical, the PCB land pattern is the same for both devices.
How does the packaging difference between the two orderable part numbers affect procurement?
The AD9751ASTZ is supplied in standard tray packaging, while the AD9753ASTZRL suffix "RL" denotes tape-and-reel packaging intended for automated pick-and-place assembly. The electrical specifications are determined by the base part number (AD9751 vs AD9753), not by the packaging suffix. Buyers should confirm reel quantity and moisture sensitivity level from the manufacturer's datasheet before production ordering.
Which part should be selected for a design requiring more than 125 MSPS?
The AD9751ASTZ must be selected, because its 300 MSPS maximum update rate covers applications above 125 MSPS. The AD9753ASTZRL is limited to 125 MSPS and is not rated for operation beyond that rate. The designer should also verify thermal and dynamic performance at the target clock rate using the AD9751ASTZ datasheet.