Part A
AD9744ARU
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 5441 個数
- Package
- TSSOP-28
- Series
- データ取得 - デジタル/アナログコンバータ (DAC)
Replacement verdict
Not a drop-in replacement
The AD9744ARU and AD974BRS are not drop-in replacements for one another. The AD9744ARU is a 14-bit, 210 MSPS TxDAC digital-to-analog converter in a 28-lead TSSOP package, while the AD974BRS is a 4-channel, 14-bit, 200 kSPS successive-approximation ADC in a 28-lead SSOP package. Their core functions, resolution-to-speed profiles, channel counts, and package footprints differ fundamentally, so neither part can be substituted for the other in an existing design without significant rework.
Different converter function
Different channel count
Different sample rate class
Different package footprint
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD9744ARU | AD974BRS | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 10 bit | Resolution determines the number of discrete output levels; a 14-bit DAC offers far finer quantization than a 10-bit DAC, directly affecting signal fidelity and dynamic range. |
| Number of D/A Converters | 1 | 1 | Both are single-channel DACs, so channel count is not a differentiator for substitutability. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Both provide unbuffered current outputs, requiring an external op-amp for voltage conversion; matching output architecture simplifies circuit reuse. |
| Supply Voltage | 2.7 V to 3.6 V | 5 V | Operating supply voltage must match the system rail; a 3.3 V part cannot directly replace a 5 V part without level shifting or rail changes. |
| Package / Case | 28-TSSOP | 28-SSOP | Footprint and package type affect PCB layout compatibility; TSSOP and SSOP are not drop-in interchangeable without layout changes. |
| Mounting Type | Surface Mount | Surface Mount | Both are surface-mount devices, so assembly method is consistent between the two parts. |
| Data Interface | Parallel | Parallel | Both use a parallel input interface, so the host controller bus architecture can remain the same. |
| Operating Temperature | -40°C to 85°C | -40°C to 85°C | Matching industrial temperature ranges ensures both parts suit the same environmental conditions. |
| Settling Time | 11 ns | 35 ns | Settling time limits maximum update rate; the faster AD9744 supports higher-speed signal generation than the AD974. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9744ARU | AD974BRS |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Obsolete | Obsolete |
| 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 |
| Series | TxDAC® | - |
Frequently asked questions
Are the AD9744ARU and AD974BRS interchangeable in an existing design?
No. The AD9744ARU is a 14-bit, 210 MSPS TxDAC digital-to-analog converter in a 28-lead TSSOP package, while the AD974BRS is a different converter family device in a 28-lead SSOP package. They differ in resolution, speed grade, package footprint, and pinout, so they are not drop-in replacements.
What are the key differences in resolution and update rate between the AD9744ARU and AD974BRS?
The AD9744ARU is a 14-bit DAC specified for up to 210 MSPS. The AD974BRS is a 12-bit DAC with a lower maximum update rate. The higher resolution and speed of the AD9744ARU make it suitable for higher-performance signal synthesis applications.
Do the AD9744ARU and AD974BRS use the same package and pinout?
No. The AD9744ARU is supplied in a 28-lead TSSOP package, while the AD974BRS is supplied in a 28-lead SSOP package. The package body dimensions and lead pitch differ, so the PCB land patterns are not compatible and the pinouts are not identical.
What are the supply voltage and power requirements for each device?
The AD9744ARU operates from a single 3.0 V to 3.6 V supply and typically consumes about 135 mW at 3.3 V. The AD974BRS operates from a 5 V supply and has higher power consumption. Designs must account for these different supply and thermal requirements.
Which device offers better dynamic performance for high-frequency synthesis?
The AD9744ARU provides higher resolution (14-bit) and a faster update rate (up to 210 MSPS), which generally yields better spurious-free dynamic range and signal-to-noise performance in high-frequency synthesis. The AD974BRS, being a 12-bit lower-speed device, is suited to less demanding applications.
Can the AD974BRS be used as a lower-cost alternative to the AD9744ARU?
Only if the design can tolerate 12-bit resolution, a lower update rate, a 5 V supply, and a different package footprint. Because the packages and pinouts differ, a board redesign is required; the two parts cannot be swapped on the same PCB without layout changes.
What interface do these DACs use for digital input?
Both devices accept parallel digital input data. The AD9744ARU uses a 14-bit parallel input bus, while the AD974BRS uses a 12-bit parallel input bus. The host FPGA or DSP must be configured to match the respective bus width and timing requirements.