Part A
AD974ARSZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5700 PCS
- Package
- SSOP-28
- Series
- Data Acquisition - ADCs-DACs - Special Purpose
Replacement verdict
Not a drop-in replacement
The AD974ARSZ and AD9740ARU are not drop-in replacements for one another. Although both are 10-bit high-speed digital-to-analog converters, they differ in resolution-adjacent architecture, package footprint, pinout, and interface timing, so a direct board-level substitution is not possible without redesign. The AD974ARSZ is a 4-channel, 10-bit D/A converter in a 28-lead SSOP, while the AD9740ARU is a single-channel, 10-bit, 210 MSPS TxDAC in a 28-lead TSSOP, meaning channel count, package, and pin assignment all diverge. Engineers should treat these as functionally distinct devices and validate any substitution against the target design's channel requirements, layout, and timing budget.
Different channel count
Different package and pinout
Different converter architecture
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 | AD9740ARU | Why it matters |
|---|---|---|---|
| Resolution | 10 bit | 10 bit | Both converters offer 10-bit resolution, so quantization noise 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. |
| Update Rate (Max) | 210 MSPS | 210 MSPS | Identical maximum sample rate allows the same clocking and output filtering design to be retained. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Both provide unbuffered current outputs, so the same external output network and termination can be used. |
| Supply Voltage | 3.0 V to 3.6 V | 2.7 V to 3.6 V | The slightly wider low-end supply range of the AD9740ARU may allow operation at lower rails, but both are 3.3 V nominal compatible. |
| Package / Mounting | 28-SSOP (Surface Mount) | 28-TSSOP (Surface Mount) | Different package footprints require PCB layout changes, affecting direct drop-in substitutability. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Matching industrial temperature ranges mean both parts suit the same environmental conditions. |
| Interface | Parallel | Parallel | Both use a parallel data interface, so the same digital driver and timing scheme can be applied. |
| Reference Type | Internal / External | Internal / External | Flexible reference options in both parts allow the same biasing and gain calibration approach. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD974ARSZ | AD9740ARU |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | - | TxDAC® |
| Part Status | Active | 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 | - |
Frequently asked questions
Are the AD974ARSZ and AD9740ARU interchangeable in an existing design?
No, they are not directly interchangeable. The AD974ARSZ is a 4-channel, 16-bit current-output DAC in a 28-lead SSOP package, while the AD9740ARU is a single-channel, 10-bit, 210 MSPS current-output DAC in a 28-lead TSSOP package. Channel count, resolution, speed, and package footprint differ, so a direct drop-in replacement is not possible without a redesign.
What are the key resolution and channel-count differences between the AD974ARSZ and AD9740ARU?
The AD974ARSZ provides four 16-bit DAC channels, whereas the AD9740ARU provides a single 10-bit DAC channel. This difference in resolution and channel density makes them suited to different applications: the AD974ARSZ targets multi-channel high-resolution control or signal generation, while the AD9740ARU targets high-speed single-channel waveform synthesis.
How do the update rates of the AD974ARSZ and AD9740ARU compare?
The AD9740ARU is specified for a maximum update rate of 210 MSPS, making it suitable for high-speed signal synthesis. The AD974ARSZ is a lower-speed, 16-bit quad DAC intended for precision multi-channel applications rather than high-speed waveform generation. The two parts therefore address different speed classes and are not comparable on a like-for-like throughput basis.
Do the AD974ARSZ and AD9740ARU use the same package and pinout?
No. The AD974ARSZ is supplied in a 28-lead SSOP package, while the AD9740ARU is supplied in a 28-lead TSSOP package. Although both are 28-lead packages, the package body dimensions, lead pitch, and PCB land patterns differ, and the pin functions are not equivalent because the devices have different channel counts and interfaces. PCB layout changes are required when migrating between them.
What are the output interface differences between the AD974ARSZ and AD9740ARU?
Both devices are current-output DACs, but their digital input interfaces differ. The AD974ARSZ uses a parallel input interface for its four 16-bit channels, while the AD9740ARU uses a high-speed parallel input interface optimized for its single 10-bit channel at up to 210 MSPS. The interface width, timing, and control signals are not compatible between the two parts.
Can the AD9740ARU replace the AD974ARSZ in a multi-channel application?
No. The AD9740ARU provides only one DAC channel, while the AD974ARSZ provides four. A single AD9740ARU cannot replicate the four-channel output of the AD974ARSZ, and using multiple AD9740ARU devices would require additional board area, separate control interfaces, and synchronization provisions not present in the original design.
Which part should be selected for high-speed single-channel waveform generation versus multi-channel precision control?
For high-speed single-channel waveform generation, the AD9740ARU is the appropriate choice given its 10-bit resolution and 210 MSPS update rate. For multi-channel precision control requiring 16-bit resolution across four channels, the AD974ARSZ is the appropriate choice. Selection should be based on the required channel count, resolution, and update rate of the target application.