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 AD9753ASTZRL are both 14-bit high-speed TxDAC digital-to-analog converters from Analog Devices in the same 48-lead LQFP package, sharing identical resolution, supply architecture, and temperature range. The AD9755ASTZ offers a higher maximum update rate (300 MSPS versus 125 MSPS) and a wider full-scale current range, making it a viable functional substitute for the AD9753ASTZRL in most designs, provided the system timing margin and output current configuration are validated against the higher-speed device.
Resolution
High match
Package Type
High match
Maximum Update Rate
Validation required
Full-Scale Output Current
Validation required
Parts at a glance
Part B
AD9753ASTZRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8876 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 | AD9753ASTZRL | 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 achievable SNR and signal fidelity. |
| Update Rate (Max) | 300 MSPS | 300 MSPS | Maximum sample rate defines the highest clock frequency at which the DAC can operate, directly limiting the bandwidth of signals that can be synthesized. |
| Number of DAC Channels | 1 | 1 | Channel count indicates whether the device provides a single or multiple independent DAC outputs, which affects system architecture and board space. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Output type determines whether the DAC sources/sinks current or voltage, which dictates the external output conditioning circuitry required. |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | Supply voltage range must match the system power rails; identical ranges mean the parts are interchangeable from a power-supply standpoint. |
| Package / Case | 48-LQFP | 48-LQFP | Package and footprint compatibility is essential for drop-in substitution on an existing PCB layout. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | The temperature range must cover the application environment to ensure reliable operation and specified performance. |
| Interface Type | Parallel | Parallel | The digital interface type must match the driving logic and timing; a parallel interface requires a corresponding parallel data bus. |
| Mounting Type | Surface Mount | Surface Mount | Mounting type determines the assembly process and must be compatible with the manufacturing method used. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9755ASTZ | AD9753ASTZRL |
|---|---|---|
| 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 | 3V ~ 3.6V | 3V ~ 3.6V |
| Voltage - Supply, Digital | 3V ~ 3.6V | 3V ~ 3.6V |
| INL / DNL(LSB) | ±2.5, ±1.5 | ±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 AD9755ASTZ and AD9753ASTZRL?
The AD9755ASTZ is a 14-bit, 300 MSPS high-speed DAC, while the AD9753ASTZRL is a 12-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 12-bit) and therefore in INL/DNL performance and SNR specifications.
Are the AD9755ASTZ and AD9753ASTZRL pin-compatible?
Yes. Both devices are offered in the same 48-lead LQFP (ST-48) package with identical pin functions, allowing the AD9753ASTZRL to be used as a drop-in 12-bit alternative to the AD9755ASTZ on the same PCB footprint when 14-bit resolution is not required.
What is the maximum update rate of these DACs?
Both the AD9755ASTZ and AD9753ASTZRL are specified for a maximum update rate of 300 MSPS, making them suitable for high-speed communications, instrumentation, and direct digital synthesis applications.
What is the resolution and accuracy difference between the two parts?
The AD9755ASTZ provides 14-bit resolution, while the AD9753ASTZRL provides 12-bit resolution. The higher resolution of the AD9755ASTZ yields finer quantization and typically better INL/DNL and SNR performance, whereas the AD9753ASTZRL offers a lower-cost option when 12-bit performance is sufficient.
Do both parts support the same digital input interface?
Yes. Both devices use a parallel CMOS-compatible digital input bus and support the same clock input structure. The AD9755ASTZ accepts 14-bit input words, while the AD9753ASTZRL accepts 12-bit input words, so the driving logic must be matched to the respective resolution.
What is the difference in the ordering suffix "ASTZ" versus "ASTZRL"?
"ASTZ" denotes the 48-lead LQFP package in lead-free (Pb-free) RoHS-compliant construction. The "RL" suffix on AD9753ASTZRL indicates tape-and-reel packaging for automated assembly, whereas AD9755ASTZ is typically supplied in tray or tube packaging. Both are the same die and package type.
Can the AD9753ASTZRL directly replace the AD9755ASTZ in an existing design?
Physically and pin-wise, yes, since both share the 48-lead LQFP footprint. However, because the AD9753ASTZRL is 12-bit, the system must be validated for reduced resolution, and any firmware or FPGA output word width must be adjusted from 14-bit to 12-bit. Performance specifications such as SNR and SFDR should be re-verified against the application requirements.