Part A
AD9751ASTZ
ADI公司
- Lifecycle
- Active
- Stock
- 3339 件
- Package
- LQFP-48
- Series
- 資料獲取-數模轉換器（DAC）
Replacement verdict
Compatible functional replacement candidate
The AD9755ASTZ and AD9751ASTZ are functionally comparable 10-bit high-speed TxDAC converters in the same 48-lead LQFP package, sharing identical resolution, supply architecture, and digital interface. The AD9755ASTZ offers a higher maximum update rate, making it a viable functional substitute for the AD9751ASTZ in most applications, provided the system timing margin and power budget are validated against the higher-speed device.
Resolution
High match
Package Type
High match
Digital Interface
High match
Maximum Update Rate
Validation required
Parts at a glance
Part B
AD9755ASTZ
ADI公司
- Lifecycle
- Active
- Stock
- 1477 件
- Package
- LQFP-48
- Series
- 資料獲取-數模轉換器（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 | AD9751ASTZ | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 10 bit | Resolution determines the number of discrete output levels; a 14-bit DAC provides 16x finer quantization than a 10-bit DAC, directly 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; both parts share the same 300 MSPS ceiling, so bandwidth capability is equivalent. |
| Number of DAC Channels | 1 | 1 | Single-channel architecture means both devices target the same single-path transmit applications, so channel count does not differentiate them. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Both provide unbuffered current outputs, requiring an external transformer or op-amp for voltage conversion; identical output topology supports similar analog front-end design. |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | Matching 3.3 V nominal supply ranges allow the same power rail design and decoupling scheme to be reused across both parts. |
| Package / Case | 48-LQFP | 48-LQFP | Identical 48-lead LQFP packages enable drop-in PCB footprint compatibility, simplifying board redesign or second-sourcing. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Equivalent industrial temperature ratings mean both parts suit the same environmental conditions without derating concerns. |
| Data Interface | Parallel CMOS | Parallel CMOS | Both use a parallel CMOS input bus, so the same digital source and timing scheme can drive either device. |
| INL / DNL Linearity | ±2.5 LSB INL (typ) | ±0.5 LSB INL (typ) | Integral nonlinearity affects absolute accuracy; the 10-bit part achieves tighter LSB-referenced linearity, though the 14-bit part offers finer absolute resolution. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9751ASTZ | AD9755ASTZ |
|---|---|---|
| Series | TxDAC+® | TxDAC+® |
| Part Status | Active | Active |
| Number of Bits | 10 | 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) | ±0.3, ±0.2 | ±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 AD9751ASTZ?
The AD9755ASTZ is a 14-bit, 300 MSPS TxDAC+ digital-to-analog converter, while the AD9751ASTZ is a 10-bit, 300 MSPS TxDAC+ DAC. Both are pin-compatible members of the same Analog Devices TxDAC+ family and share the same 48-lead LQFP package, but they differ in resolution (14-bit vs 10-bit) and therefore in INL/DNL, SNR, and SFDR performance specifications.
Are the AD9755ASTZ and AD9751ASTZ pin-compatible?
Yes. Both devices are offered in the same 48-lead LQFP (ST-48) package and belong to the same Analog Devices TxDAC+ pin-compatible family, allowing a common PCB footprint. Designers should still verify all pin functions against the respective datasheets before substitution.
What is the maximum update rate of these DACs?
Both the AD9755ASTZ and AD9751ASTZ 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 of each device?
The AD9755ASTZ provides 14-bit resolution, whereas the AD9751ASTZ provides 10-bit resolution. The higher resolution of the AD9755ASTZ yields lower quantization noise and better dynamic range for demanding signal synthesis applications.
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 structure per family convention, and both include on-chip 1.2 V reference circuitry and a flexible input latch. Refer to each datasheet for exact timing and input voltage level specifications.
What is the typical power consumption of these DACs?
Both the AD9755ASTZ and AD9751ASTZ are specified for low power operation at approximately 155 mW at 3.3 V, consistent with the Analog Devices TxDAC+ family power profile. Actual consumption depends on update rate and output configuration.
Can the AD9751ASTZ be used as a drop-in replacement for the AD9755ASTZ?
Not as a functional drop-in replacement. Although the devices are pin-compatible and share the same package and 300 MSPS update rate, the AD9751ASTZ offers only 10-bit resolution versus 14-bit on the AD9755ASTZ, so system resolution, INL/DNL, SNR, and SFDR requirements must be revalidated against the target design before substitution.