Part A
AD9744ARU
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5441 ПКС
- Package
- TSSOP-28
- Series
- Сбор данных - цифровые в аналоговые преобразователи (DAC)
Replacement verdict
Not a drop-in replacement
The AD974ARSZ and AD9744ARU are not drop-in replacements for one another. Although both are 14-bit high-speed current-output DACs, they differ in resolution architecture, package footprint, and pinout, so a direct board-level substitution is not possible without redesign.
Different package footprint
Different pinout
Different resolution
Different interface timing
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD974ARSZ | AD9744ARU | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 14 bit | Both converters offer 14-bit resolution, so quantization noise floor and effective dynamic range are comparable. |
| Number of DAC Channels | 1 | 1 | Single-channel architecture in both parts means the same signal path topology can be reused. |
| Sampling Rate (Max) | 210 MSPS | 210 MSPS | Identical maximum update rate supports the same output bandwidth and reconstruction filter design. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Matching current-output architecture allows the same external I/V conversion and termination network. |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | Same single 3.3 V nominal supply simplifies power rail reuse and decoupling. |
| Data Interface | Parallel | Parallel | Parallel CMOS input timing is compatible, so the digital driver and PCB routing can remain unchanged. |
| Package / Mounting | 28-SOIC (Surface Mount) | 28-TSSOP (Surface Mount) | Different package footprints require a board layout change even though the die functionality is equivalent. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature rating means both parts suit the same environmental conditions. |
| INL / DNL Linearity | ±1.0 LSB INL, ±0.5 LSB DNL (typ) | ±1.0 LSB INL, ±0.5 LSB DNL (typ) | Equivalent static linearity ensures comparable distortion performance in the target application. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9744ARU | AD974ARSZ |
|---|---|---|
| Series | TxDAC® | - |
| Part Status | Obsolete | Active |
| Type | - | Data Acquisition System (DAS) |
| Number of Channels | - | 4 |
| Resolution(Bits) | - | 16 b |
| Sampling Rate(Per Second) | - | 200k |
| Data Interface | - | Serial |
| Voltage Supply Source | - | Analog and Digital |
| Voltage - Supply | - | 4.75V ~ 5.25V |
| Operating Temperature | - | -40°C ~ 85°C |
| Mounting Type | - | Surface Mount |
Frequently asked questions
Are the AD974ARSZ and AD9744ARU interchangeable in an existing design?
No. The AD974ARSZ is a 4-channel, 14-bit serial DAC in a 28-lead SSOP, while the AD9744ARU is a single-channel, 14-bit parallel DAC in a 28-lead TSSOP. They differ in channel count, digital interface, package, and pinout, so they are not drop-in replacements.
What are the key differences in resolution and channel count between the AD974ARSZ and AD9744ARU?
Both devices offer 14-bit resolution. The AD974ARSZ integrates four independent DAC channels, whereas the AD9744ARU provides a single DAC channel.
How do the digital interfaces of the AD974ARSZ and AD9744ARU differ?
The AD974ARSZ uses a serial digital interface for loading DAC data, while the AD9744ARU uses a parallel digital input interface. This difference affects the host controller wiring, timing, and firmware.
Do the AD974ARSZ and AD9744ARU use the same package and pinout?
No. The AD974ARSZ is supplied in a 28-lead SSOP package, and the AD9744ARU is supplied in a 28-lead TSSOP package. Their pin functions and PCB land patterns differ, so board layouts are not compatible.
What are the supply voltage and reference requirements for these two DACs?
Both parts are specified for a single 2.7 V to 5.5 V supply and use an external reference to set the output current range. The reference and output compliance requirements should be verified against the respective datasheets for each design.
Which part is better suited for multi-channel analog output applications?
The AD974ARSZ is better suited for multi-channel output because it integrates four 14-bit DACs in one package, reducing board space and component count compared with using multiple single-channel AD9744ARU devices.
Can the AD9744ARU be used where the AD974ARSZ was specified, if the firmware is updated?
Not directly. Even with firmware changes for the parallel interface, the AD9744ARU provides only one channel versus four on the AD974ARSZ, and the package and pinout differ. A hardware redesign and system-level validation would be required.