Part A
AD9755ASTZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1477 Stückzahl
- Package
- LQFP-48
- Series
- Data Acquisition von Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9755ASTZ and AD9751ASTRL are both 10-bit high-speed TxDAC digital-to-analog converters from Analog Devices in a 48-lead LQFP package, sharing the same resolution, supply architecture, and interface family. The AD9755ASTZ offers a higher maximum update rate and a wider output bandwidth, while the AD9751ASTRL provides a lower-power option with a reduced clock ceiling. Both are functionally interchangeable in many DAC signal-chain designs, but the update-rate and power trade-off should be validated against the target application's timing and thermal budget before substitution.
Resolution and DAC Architecture
High match
Package and Pin Configuration
High match
Maximum Update Rate
Validation required
Power Consumption
Validation required
Parts at a glance
Part B
AD9751ASTRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5648 Stückzahl
- Package
- LQFP-48
- Series
- Data Acquisition von 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 | AD9755ASTZ | AD9751ASTRL | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 10 bit | Resolution determines the number of discrete output levels; a 14-bit DAC provides 16x finer quantization than a 10-bit DAC, directly affecting signal fidelity and SFDR. |
| Maximum Update Rate | 300 MSPS | 300 MSPS | The maximum clock rate sets the highest sample rate the DAC can support; both parts share the same 300 MSPS ceiling, so bandwidth requirements are met equally. |
| Number of DAC Channels | 1 | 1 | Single-channel architecture means both devices suit single-path transmit chains; channel count must match the system's signal path topology. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Current-output DACs require an external I/V stage; matching output type ensures the analog front-end design remains compatible. |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | Operating supply range must match the board's regulated rail; identical 3.3 V nominal supplies allow drop-in power design reuse. |
| Package / Case | 48-LQFP | 48-LQFP | Package and pinout compatibility determine whether a part can be placed on an existing PCB footprint without layout changes. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Industrial temperature range ensures reliable operation across harsh environments; matching ranges confirm equivalent environmental ratings. |
| Interface | Parallel | Parallel | A parallel input interface dictates the digital bus width and timing; both parts use parallel CMOS inputs, so the FPGA/ASIC driver design is interchangeable. |
| Mounting Type | Surface Mount | Surface Mount | Mounting style must match the assembly process; both being surface-mount SMD parts allows use on the same reflow assembly line. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9755ASTZ | AD9751ASTRL |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | TxDAC+® | TxDAC+® |
| Part Status | Active | Obsolete |
| Number of Bits | 14 | - |
| 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 | 3V ~ 3.6V | - |
| Voltage - Supply, Digital | 3V ~ 3.6V | - |
| INL / DNL(LSB) | ±2.5, ±1.5 | - |
| Architecture | Current Source | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the key differences between the AD9755ASTZ and AD9751ASTRL?
The AD9755ASTZ is a 14-bit, 300 MSPS high-speed DAC, while the AD9751ASTRL is a 10-bit, 300 MSPS DAC. Both are members of Analog Devices' TxDAC+ family and are pin-compatible in the same 48-lead LQFP package, but they differ in resolution (14-bit vs 10-bit) and therefore in dynamic performance specifications such as SNR and SFDR.
Are the AD9755ASTZ and AD9751ASTRL pin-compatible?
Yes. Both devices are offered in a 48-lead LQFP package with the same pinout, which allows a common PCB footprint. However, because the resolution differs (14-bit vs 10-bit), designers must verify that the digital input interface and system performance requirements are satisfied before substituting one for the other.
What is the maximum update rate of these DACs?
Both the AD9755ASTZ and AD9751ASTRL are specified for a maximum update rate of 300 MSPS, making them suitable for high-speed signal synthesis, communications, and instrumentation applications.
What is the resolution of each device?
The AD9755ASTZ provides 14-bit resolution, offering finer quantization and lower quantization noise than the AD9751ASTRL, which provides 10-bit resolution. The higher resolution of the AD9755ASTZ generally yields better SNR and lower distortion in demanding applications.
What digital input interface do these DACs use?
Both devices accept parallel digital input data and operate from a nominal 3.0 V to 3.6 V digital supply. The AD9755ASTZ uses a 14-bit parallel input bus, while the AD9751ASTRL uses a 10-bit parallel input bus, so the driving logic and data width must match the selected device.
What are the typical power supply requirements?
Both the AD9755ASTZ and AD9751ASTRL operate from a single 3.0 V to 3.6 V analog supply and a 3.0 V to 3.6 V digital supply, with a nominal full-scale output current programmable via an external resistor. Designers should consult the respective datasheets for exact current consumption and power dissipation figures.
Can the AD9751ASTRL be used as a drop-in replacement for the AD9755ASTZ?
Not as a functional drop-in replacement. Although the package and pinout are compatible, the AD9751ASTRL is a 10-bit device versus the 14-bit AD9755ASTZ, so system resolution, SNR, and SFDR performance would be reduced. A replacement should only be made after validating that the lower resolution meets the design's performance requirements.