Part A
AD9751ASTZRL
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 2412 個数
- Series
- データ取得 - デジタル/アナログコンバータ (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9753ASTZ and AD9751ASTZRL are both 10-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 AD9753ASTZ offers a higher maximum update rate (300 MSPS versus 125 MSPS) and a faster on-chip settling time, making it a viable functional upgrade candidate for the AD9751ASTZRL in most designs, provided the higher clock rate and dynamic performance requirements are validated against the target application.
Resolution
High match
Package Type
High match
Maximum Update Rate
Validation required
Operating Temperature Range
High match
Parts at a glance
Part B
AD9753ASTZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4116 個数
- Package
- LQFP-48
- Series
- データ取得 - デジタル/アナログコンバータ (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 | AD9753ASTZ | AD9751ASTZRL | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 10 bit | Resolution determines the number of discrete output levels; a 12-bit DAC offers 4x finer quantization than a 10-bit DAC, affecting signal fidelity and SFDR performance. |
| Maximum Update Rate | 300 MSPS | 300 MSPS | The maximum clock rate sets the highest sample rate the DAC can support, which bounds the achievable output bandwidth in the target application. |
| Number of DAC Channels | 1 | 1 | Channel count determines whether the device can drive single or multiple signal paths; both are single-channel, so this is functionally equivalent. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Output architecture dictates the external interface circuitry required; unbuffered current outputs need an external op-amp or transformer for voltage conversion. |
| Supply Voltage | 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 same rail as surrounding digital and analog circuitry without level shifting. |
| Package / Case | 48-LQFP | 48-LQFP | Package and footprint must match for a drop-in replacement on an existing PCB; identical LQFP packages allow direct substitution. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | The temperature range defines the environments in which the part is guaranteed to meet specifications, critical for industrial and outdoor applications. |
| Interface Type | Parallel | Parallel | The digital input interface must match the driving logic; both use a parallel interface, so the host FPGA/ASIC connection scheme is unchanged. |
| Mounting Type | Surface Mount | Surface Mount | Mounting style affects assembly process and board layout; both are surface-mount, allowing use of the same reflow assembly flow. |
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 | AD9751ASTZRL | AD9753ASTZ |
|---|---|---|
| Series | TxDAC+® | TxDAC+® |
| Part Status | Active | Active |
| Digi Key Programmable | Not Verified | - |
| Number of Bits | 10 | 12 |
| Number of D / A Converters | 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 | - |
| Architecture | Current Source | Current Source |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | - |
| Base Product Number | AD9751 | - |
| Number of D/A Converters | - | 1 |
| INL / DNL(LSB) | - | ±0.5, ±0.4 |
Frequently asked questions
What are the key differences between the AD9753ASTZ and AD9751ASTZRL?
The AD9753ASTZ is a 12-bit, 300 MSPS high-speed DAC, while the AD9751ASTZRL is a 10-bit, 300 MSPS high-speed DAC. Both are members of Analog Devices' TxDAC+ family and share the same 48-lead LQFP package and pinout, but they differ in resolution (12-bit vs 10-bit) and therefore in dynamic performance specifications such as SNR and SFDR.
Are the AD9753ASTZ and AD9751ASTZRL pin-compatible?
Yes. Both devices are offered in the same 48-lead LQFP (ST-48) package with an identical pin configuration, allowing the AD9751ASTZRL to be used as a drop-in lower-resolution alternative to the AD9753ASTZ on the same PCB layout, provided the system performance requirements are met.
What is the maximum update rate of these DACs?
Both the AD9753ASTZ and AD9751ASTZRL support a maximum update rate of 300 MSPS, making them suitable for high-speed applications such as broadband communications, direct digital synthesis, and instrumentation.
What is the resolution difference and how does it affect performance?
The AD9753ASTZ provides 12-bit resolution, offering 4096 output levels, while the AD9751ASTZRL provides 10-bit resolution, offering 1024 output levels. The higher resolution of the AD9753ASTZ generally yields better signal-to-noise ratio (SNR) and lower quantization noise, which can be advantageous in demanding communication systems.
What digital input interface do these DACs use?
Both devices feature a CMOS-compatible digital input interface that accepts binary or twos complement data formats. The input data rate supports the full 300 MSPS update rate, and the devices include an on-chip input register for latching data.
What is the difference between the AD9753ASTZ and AD9751ASTZRL ordering codes?
The "ASTZ" suffix indicates a 48-lead LQFP package in a tray or tube format, while the "ASTZRL" suffix indicates the same package supplied in tape-and-reel format for automated assembly. Both are RoHS-compliant. The "RL" designation refers only to packaging, not to device performance or resolution.
Can the AD9751ASTZRL be used as a lower-cost alternative to the AD9753ASTZ?
Yes, in applications where 10-bit resolution is sufficient, the AD9751ASTZRL can serve as a lower-cost, pin-compatible alternative to the 12-bit AD9753ASTZ. Designers should verify that the reduced resolution and associated dynamic performance still meet system requirements before substituting.