Part A
AD9755ASTZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 1477 PCS
- Package
- LQFP-48
- Series
- Acquisition de données - convertisseur numérique - analogique (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9755ASTZ and AD9753AST 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 digital interface family. The AD9755ASTZ offers a higher maximum update rate and extended temperature range, making it a viable functional upgrade candidate for AD9753AST designs, provided the board-level timing budget and thermal conditions are validated against the higher-speed device.
Resolution
High match
Package Type
High match
Maximum Update Rate
Validation required
Operating Temperature Range
Validation required
Parts at a glance
Part B
AD9753AST
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 3906 PCS
- Package
- LQFP-48
- Series
- Acquisition de données - convertisseur numérique - analogique (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 | AD9753AST | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 12 bit | Higher resolution provides finer output granularity and lower quantization error, 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. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Output architecture affects the external interface circuitry required to convert the DAC current into a usable voltage. |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | Supply voltage compatibility ensures the part can drop into the same power rail design without modification. |
| Package / Case | 48-LQFP | 48-LQFP | Matching package and footprint allows direct board-level substitution without layout changes. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical temperature ratings confirm both parts suit the same environmental conditions. |
| Interface Type | Parallel | Parallel | A matching digital interface simplifies the FPGA/controller connection and timing design. |
| Mounting Type | Surface Mount | Surface Mount | Consistent mounting style supports the same assembly process and board design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9755ASTZ | AD9753AST |
|---|---|---|
| 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 the AD9753AST?
The AD9755ASTZ is a 14-bit, 300 MSPS high-speed DAC, while the AD9753AST is a 12-bit, 125 MSPS high-speed DAC. The AD9755ASTZ offers higher resolution and a faster update rate, whereas the AD9753AST is a lower-resolution, lower-speed device in the same TxDAC family.
Are the AD9755ASTZ and AD9753AST pin-compatible?
Both devices are offered in a 48-lead LQFP package and belong to the same AD975x TxDAC family, sharing a common pinout architecture. However, designers should verify the specific pin functions and configuration against the respective datasheets before considering a direct board-level swap.
What is the maximum update rate of each device?
The AD9755ASTZ supports a maximum update rate of 300 MSPS, while the AD9753AST supports a maximum update rate of 125 MSPS. The higher throughput of the AD9755ASTZ makes it suitable for wider-bandwidth signal synthesis applications.
What resolution does each DAC provide?
The AD9755ASTZ provides 14-bit resolution, and the AD9753AST provides 12-bit resolution. The additional 2 bits on the AD9755ASTZ yield lower quantization noise and improved spurious-free dynamic range for demanding applications.
Do both parts support the same digital input interface?
Yes, both the AD9755ASTZ and AD9753AST use a parallel CMOS-compatible digital input interface for loading data words. The AD9755ASTZ accepts 14-bit input words, while the AD9753AST accepts 12-bit input words, so the driving logic and data bus width must match the selected device.
Can the AD9753AST be used as a drop-in replacement for the AD9755ASTZ?
No, the AD9753AST should not be treated as a drop-in replacement for the AD9755ASTZ. Although they share the same package family and TxDAC architecture, the difference in resolution (12-bit vs 14-bit) and maximum update rate (125 MSPS vs 300 MSPS) means the system timing, data bus, and performance budget must be revalidated.
What are typical applications for these high-speed DACs?
Both devices are intended for high-speed signal synthesis applications such as communications transmit paths, direct digital synthesis, waveform generation, and instrumentation. The AD9755ASTZ, with its higher 300 MSPS rate and 14-bit resolution, is better suited to wider-bandwidth and higher-dynamic-range requirements, while the AD9753AST fits lower-bandwidth 12-bit designs.