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 AD9753ASTZ is a pin-compatible functional upgrade candidate for the AD9751ASTZ, sharing the same 48-lead LQFP footprint, 14-bit DAC resolution, and 300 MSPS maximum update rate, while offering improved dynamic performance and an on-chip PLL. Designers should validate timing margins, output configuration, and thermal behavior in the target application before committing to a drop-in substitution.
Resolution and Update Rate
High match
Package and Pinout
High match
Digital Interface and Clocking
Validation required
Dynamic Performance
Validation required
Parts at a glance
Part B
AD9753ASTZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4116 ПКС
- Package
- LQFP-48
- Series
- Сбор данных - цифровые в аналоговые преобразователи (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 | AD9751ASTZ | AD9753ASTZ | Why it matters |
|---|---|---|---|
| Resolution | 10 bit | 12 bit | Higher resolution reduces quantization error and improves dynamic range, which directly affects signal fidelity in DAC applications. |
| Maximum Update Rate | 300 MSPS | 300 MSPS | The update rate determines the maximum sample clock the DAC can accept, setting the achievable output bandwidth. |
| Number of DAC Channels | 1 | 1 | Channel count determines how many independent analog outputs are available in a single package. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Output type dictates the external interface circuitry required to convert the DAC output to 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 operate within the system's power rail without additional regulation. |
| Package / Case | 48-LQFP | 48-LQFP | Package and footprint compatibility determines whether the part can be dropped into an existing PCB layout. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | The temperature range defines the environments in which the component can reliably operate. |
| Interface Type | Parallel | Parallel | The digital interface type must match the host controller's output to ensure correct data transfer. |
| Mounting Type | Surface Mount | Surface Mount | Mounting type affects assembly process and board space requirements. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9751ASTZ | AD9753ASTZ |
|---|---|---|
| Series | TxDAC+® | TxDAC+® |
| Part Status | Active | Active |
| Number of Bits | 10 | 12 |
| 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 | ±0.5, ±0.4 |
| 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 AD9751ASTZ and AD9753ASTZ?
Both are dual-channel, 10-bit TxDAC+ digital-to-analog converters from Analog Devices in a 48-lead LQFP package. The AD9751ASTZ is specified for a 300 MSPS update rate, while the AD9753ASTZ is specified for a 125 MSPS update rate. The higher update rate of the AD9751ASTZ supports wider signal bandwidths, whereas the AD9753ASTZ targets lower-power, lower-speed applications.
Are the AD9751ASTZ and AD9753ASTZ pin-compatible?
Yes. Both devices are offered in the same 48-lead LQFP (STZ) package with the same pinout, so they are pin-compatible. However, pin compatibility alone does not guarantee interchangeability; the maximum update rate, power dissipation, and dynamic performance specifications differ and must be validated for the target design.
What is the resolution and channel count of these DACs?
Both the AD9751ASTZ and AD9753ASTZ are dual-channel (two DACs per package) 10-bit CMOS digital-to-analog converters with on-chip output switches and current-output architecture, part of the Analog Devices TxDAC+ family.
What are the maximum update rates of the AD9751ASTZ and AD9753ASTZ?
The AD9751ASTZ is specified for a maximum update rate of 300 MSPS. The AD9753ASTZ is specified for a maximum update rate of 125 MSPS. Designs requiring the higher conversion rate should use the AD9751ASTZ.
What digital input interface do these devices use?
Both parts accept parallel 10-bit digital input words per channel and are designed for high-speed CMOS logic interfaces. The input timing, setup/hold requirements, and maximum clock rate differ between the 300 MSPS AD9751ASTZ and the 125 MSPS AD9753ASTZ, so the digital source and PCB timing must be verified against the respective datasheet.
What is the supply voltage and output configuration?
Both devices operate from a single supply in the 3.0 V to 3.6 V range with a nominal 3.3 V supply, and provide differential current outputs intended to drive a transformer or resistor load. Exact supply current and power dissipation figures differ between the two speed grades and should be taken from the respective manufacturer datasheet.
Can the AD9753ASTZ be used as a drop-in replacement for the AD9751ASTZ?
Not unconditionally. Although the package and pinout match, the AD9753ASTZ has a lower maximum update rate (125 MSPS versus 300 MSPS) and different power and dynamic performance specifications. A replacement is acceptable only if the system clock rate, signal bandwidth, and power budget are re-validated against the AD9753ASTZ datasheet.
Which device should be selected for higher-speed applications?
The AD9751ASTZ should be selected when the application requires update rates up to 300 MSPS, such as wideband communications or high-speed waveform generation. The AD9753ASTZ is appropriate where 125 MSPS is sufficient and lower power or cost is preferred. Final selection should be confirmed against the manufacturer datasheets for both parts.