Part A
AD9751ASTZRL
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 2412 PCS
- Series
- Acquisition de données - convertisseur numérique - analogique (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9755ASTZ 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 digital interface family. The AD9755ASTZ offers a higher maximum update rate and superior dynamic performance, making it a viable functional substitute for the AD9751ASTZRL in most designs, provided the system timing margin and power budget are validated against the higher-speed device.
Resolution
High match
Package Type
High match
Maximum Update Rate
Validation required
Power Consumption
Validation required
Parts at a glance
Part B
AD9755ASTZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 1477 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 | AD9751ASTZRL | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 10 bit | Higher resolution provides finer output granularity and lower quantization error; a 14-bit DAC cannot be directly substituted by a 10-bit part without degrading signal fidelity. |
| Number of DAC Channels | 1 | 1 | Both are single-channel DACs, so channel count is compatible for single-path signal chain designs. |
| Sampling Rate (Max) | 300 MSPS | 300 MSPS | Matching maximum update rates allow either part to support the same high-speed signal synthesis bandwidth. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Identical current-output architecture means the same external output network and termination can be reused. |
| Supply Voltage (Analog/Digital) | 3.0 V to 3.6 V | 3.0 V to 3.6 V | Same supply range ensures power rail compatibility and identical decoupling requirements. |
| Package / Case | 48-LQFP | 48-LQFP | Identical package and pinout allow drop-in board placement without layout changes. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Same industrial temperature range supports use in identical environmental conditions. |
| Interface Type | Parallel CMOS | Parallel CMOS | Matching parallel CMOS input interface allows the same digital controller and timing to drive either device. |
| INL / DNL Linearity | ±1.0 LSB INL (typ) | ±0.5 LSB INL (typ) | Linearity differences affect static accuracy and distortion; the 10-bit part specifies tighter LSB linearity, so substitution changes achievable accuracy. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9751ASTZRL | AD9755ASTZ |
|---|---|---|
| Series | TxDAC+® | TxDAC+® |
| Part Status | Active | Active |
| Digi Key Programmable | Not Verified | - |
| Number of Bits | 10 | 14 |
| 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) | - | ±2.5, ±1.5 |
Frequently asked questions
What are the key differences between the AD9755ASTZ and AD9751ASTZRL?
The AD9755ASTZ is a 14-bit, 300 MSPS high-speed DAC, while the AD9751ASTZRL is a 10-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 10-bit) and therefore in INL/DNL performance and SFDR characteristics.
Are the AD9755ASTZ and AD9751ASTZRL pin-compatible?
Yes. Both devices are offered in the same 48-lead LQFP (ST-48) package with the same pinout, which allows a common PCB footprint. However, because the resolution differs, designers must verify that the system's digital interface and performance requirements are met when substituting one for the other.
What is the maximum update rate of these DACs?
Both the AD9755ASTZ and AD9751ASTZRL 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 AD9751ASTZRL provides 10-bit resolution. The higher resolution of the AD9755ASTZ yields finer quantization and typically better INL/DNL and lower quantization noise, which matters in applications requiring high dynamic range.
Do both parts support the same digital input interface?
Yes. Both devices use a parallel CMOS-compatible digital input interface with the same data bus width arrangement per their respective resolutions, and both operate from a nominal 3.3 V digital supply with a separate analog supply, consistent with the TxDAC+ family architecture.
What is the difference between the ASTZ and ASTZRL ordering suffixes?
The "ASTZ" suffix denotes the RoHS-compliant 48-lead LQFP package. The "RL" suffix on AD9751ASTZRL indicates tape-and-reel packaging for automated assembly, whereas AD9755ASTZ is typically supplied in tray form. The silicon device itself is identical within each part number.
Can the AD9751ASTZRL be used as a drop-in replacement for the AD9755ASTZ?
Physically it can be placed on the same footprint due to pin compatibility, but it is not a functional drop-in replacement because the resolution drops from 14 bits to 10 bits. The system's SNR, SFDR, and effective number of bits (ENOB) requirements must be re-evaluated before substitution.