Part A
AD9751ASTZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3339 ПКС
- Package
- LQFP-48
- Series
- Сбор данных - цифровые в аналоговые преобразователи (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9751ASTZ and AD9753AST are both 10-bit high-speed TxDAC digital-to-analog converters from Analog Devices in the same 48-lead LQFP package, sharing core resolution, supply, and temperature characteristics. However, they differ in maximum update rate and on-chip digital features, so the AD9753AST can serve as a functional substitute for the AD9751ASTZ only after validating the system's sampling-rate margin and digital interface requirements.
Resolution
High match
Maximum Update Rate
Validation required
Package Type
High match
Digital Interface Features
Validation required
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 | AD9753AST | 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. |
| Maximum Update Rate | 300 MSPS | 300 MSPS | The maximum clock rate determines the highest sample rate the DAC can support for wideband signal synthesis. |
| Number of DAC Channels | 1 | 1 | Single-channel architecture is required for matching the signal path topology of the target design. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Current-output DACs require an external I/V stage; matching output type ensures the analog front-end remains compatible. |
| Supply Voltage (Analog/Digital) | 3.0 V to 3.6 V | 3.0 V to 3.6 V | Supply voltage compatibility ensures the part can be powered from the existing rail without level shifting or regulator changes. |
| Package / Case | 48-LQFP | 48-LQFP | Identical package and footprint allow drop-in replacement without PCB redesign. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Matching temperature ratings confirm the part is suitable for the same environmental conditions as the original design. |
| Interface | Parallel | Parallel | Interface compatibility ensures the digital input timing and bus width remain compatible with the driving logic. |
| Mounting Type | Surface Mount | Surface Mount | Consistent mounting type is required for assembly compatibility on the existing PCB. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9751ASTZ | AD9753AST |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | TxDAC+® | TxDAC+® |
| Part Status | Active | Obsolete |
| Number of Bits | 10 | - |
| 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) | ±0.3, ±0.2 | - |
| Architecture | Current Source | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the key differences between the AD9751ASTZ and the AD9753AST?
The AD9751ASTZ is a 10-bit, 300 MSPS dual-channel transmit DAC, while the AD9753AST is a 12-bit, 300 MSPS dual-channel transmit DAC. Both are members of Analog Devices' TxDAC+ family and share the same 48-lead LQFP package and pinout, but the AD9753AST offers 2 additional bits of resolution compared with the AD9751ASTZ.
Are the AD9751ASTZ and AD9753AST pin-compatible?
Yes. Both devices are offered in the same 48-lead LQFP (ST-48) package with an identical pinout, which allows a common PCB footprint. Designers should still verify all supply, reference, and clock pin functions against the respective datasheets before substituting one for the other.
What is the maximum update rate of the AD9751ASTZ and AD9753AST?
Both the AD9751ASTZ and the AD9753AST are specified for a maximum update rate of 300 MSPS, making them suitable for high-speed transmit applications such as wireless base stations and broadband communications systems.
What resolution does each DAC provide?
The AD9751ASTZ provides 10-bit resolution, while the AD9753AST provides 12-bit resolution. The higher resolution of the AD9753AST yields lower quantization noise and improved dynamic range, which can be advantageous in applications with demanding spectral requirements.
Do the AD9751ASTZ and AD9753AST support the same digital input interface?
Yes. Both devices use a parallel digital input interface with dual-channel data ports and support the same supply and clocking scheme per their datasheets. The AD9753AST accepts 12-bit input words, whereas the AD9751ASTZ accepts 10-bit input words, so the driving logic must be configured accordingly.
Can the AD9751ASTZ be replaced by the AD9753AST in an existing design?
Because the two parts share the same package, pinout, and 300 MSPS update rate, the AD9753AST can often serve as a drop-in upgrade where higher resolution is desired. However, the input data width differs (10-bit versus 12-bit), so the digital source, PCB routing, and firmware must be validated against the AD9753AST datasheet before substitution.
What are the typical applications for these dual transmit DACs?
Both the AD9751ASTZ and AD9753AST are intended for high-speed transmit signal chains, including wireless base station transmitters, broadband communication systems, and other applications requiring dual high-speed DACs with update rates up to 300 MSPS.