Part A
AD9753ASTZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4116 PCS
- Package
- LQFP-48
- Series
- Acquisição de dados - Convertedores digitais para analógicos (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9755ASTZ and AD9753ASTZ are functionally comparable 14-bit high-speed TxDAC converters sharing the same resolution, update rate class, and 48-lead LQFP package, making the AD9755ASTZ a viable functional replacement candidate for the AD9753ASTZ in most designs. However, the two devices differ in on-chip interpolation filter configuration and digital input interface characteristics, so the replacement should be validated against the specific signal-chain and interface requirements of the target application before adoption.
Resolution and Update Rate
High match
Package and Pin Configuration
High match
On-Chip Interpolation Filter
Validation required
Digital Input Interface
Validation required
Parts at a glance
Part B
AD9755ASTZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1477 PCS
- Package
- LQFP-48
- Series
- Acquisição de dados - Convertedores digitais para analógicos (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 | AD9753ASTZ | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 12 bit | Higher resolution provides finer output quantization and lower quantization noise, directly affecting signal fidelity and SFDR performance. |
| Maximum Update Rate | 300 MSPS | 300 MSPS | The maximum DAC update rate determines the highest synthesizable output frequency and the oversampling capability in the target application. |
| Number of DAC Channels | 1 | 1 | Channel count determines whether the device can drive single or multiple signal paths without external multiplexing. |
| Output Type | Current - Unbuffered | Current - Unbuffered | The output architecture dictates the external termination and amplifier circuitry required to convert the DAC current into a usable voltage signal. |
| 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. |
| Package / Case | 48-LQFP | 48-LQFP | Package and footprint compatibility determines whether the parts are drop-in replacements on an existing PCB layout. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | The temperature range confirms suitability for industrial-grade environments and thermal design margins. |
| Interface | Parallel | Parallel | The digital interface type must match the driving logic and timing requirements of the upstream data source. |
| SFDR | 69 dBc (at 100 MSPS, 40 MHz output) | 69 dBc (at 100 MSPS, 40 MHz output) | Spurious-free dynamic range indicates spectral purity and is critical for communication and instrumentation signal chains. |
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 | AD9753ASTZ | AD9755ASTZ |
|---|---|---|
| Series | TxDAC+® | TxDAC+® |
| Part Status | Active | Active |
| Number of Bits | 12 | 14 |
| 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) | ±0.5, ±0.4 | ±2.5, ±1.5 |
| 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 AD9753ASTZ?
Both are dual-channel, 14-bit high-speed TxDAC+ digital-to-analog converters from Analog Devices in a 48-lead LQFP package. The primary difference is the maximum update rate: the AD9755ASTZ supports up to 300 MSPS, while the AD9753ASTZ supports up to 125 MSPS. Both offer the same 14-bit resolution, on-chip 1.2 V reference, and differential current outputs.
Are the AD9755ASTZ and AD9753ASTZ pin-compatible?
Yes. Both devices are offered in the same 48-lead LQFP (STZ) package with the same pinout, which allows the AD9753ASTZ to be used in a layout designed for the AD9755ASTZ when the lower 125 MSPS update rate is acceptable.
What is the resolution and update rate of each device?
The AD9755ASTZ is a dual 14-bit DAC with a maximum update rate of 300 MSPS. The AD9753ASTZ is a dual 14-bit DAC with a maximum update rate of 125 MSPS. Both provide 14-bit resolution on each of the two channels.
Do both parts use the same supply voltage and output configuration?
Yes. Both the AD9755ASTZ and AD9753ASTZ operate from a single 3.0 V to 3.6 V analog and digital supply and provide differential current outputs. Both integrate a 1.2 V on-chip reference and support an external reference if required by the application.
Can the AD9753ASTZ directly replace the AD9755ASTZ in an existing design?
Because the two devices share the same package, pinout, resolution, and supply requirements, the AD9753ASTZ can be considered a drop-in replacement only if the system's required update rate does not exceed 125 MSPS. Designs requiring sample rates above 125 MSPS must retain the AD9755ASTZ.
Which device should be selected for higher-speed applications?
The AD9755ASTZ should be selected for applications requiring update rates up to 300 MSPS, such as high-speed communications and wideband signal synthesis. The AD9753ASTZ is appropriate for applications limited to 125 MSPS where lower power and cost may be advantageous.
Are both devices specified over the same operating temperature range?
Yes. Both the AD9755ASTZ and AD9753ASTZ are specified for operation over the industrial temperature range of −40 °C to +85 °C, consistent with the STZ package suffix ordering information from Analog Devices.