Part A
AD974ARSZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 5700 PCS
- Package
- SSOP-28
- Series
- Acquisition de données - ADC DAC - dédié
Replacement verdict
Not a drop-in replacement
AD974ARSZ and AD9740ARURL7 are not drop-in replacements for one another. Although both are 10-bit high-speed digital-to-analog converters, they differ in resolution architecture, package and footprint, pinout, and specified dynamic performance, so a direct board-level substitution is not possible without redesign and requalification.
Different package and footprint
Different pinout
Different dynamic performance
Different supply and interface requirements
Parts at a glance
Part B
AD9740ARURL7
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 4799 PCS
- Package
- TSSOP-28
- Series
- Acquisition de données - convertisseur numérique - analogique (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 | AD974ARSZ | AD9740ARURL7 | Why it matters |
|---|---|---|---|
| Resolution | 10 bit | 10 bit | Bit depth determines the quantization granularity of the DAC output; both are 10-bit so reconstruction accuracy is comparable. |
| Number of DAC Channels | 1 | 1 | Single-channel architecture means both parts serve the same single-path signal chain role. |
| Update Rate (Sample Rate) | 210 MSPS | 210 MSPS | Maximum conversion rate sets the achievable output bandwidth and must match the application's signal frequency requirements. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Current-output DACs require an external I/V stage; matching output topology ensures the analog front-end design remains compatible. |
| Supply Voltage | 2.7 V to 3.6 V | 2.7 V to 3.6 V | Operating supply range must be compatible with the board's power rail to avoid level-shifting or regulator changes. |
| Package / Mounting Type | 28-SSOP, Surface Mount | 28-TSSOP, Surface Mount | Different package footprints (SSOP vs TSSOP) affect PCB land pattern and may require layout changes for direct substitution. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | Industrial temperature range confirms both parts are suitable for the same environmental conditions. |
| Interface | Parallel | Parallel | Parallel input interface determines the digital host connection and timing; matching interfaces simplifies drop-in replacement. |
| Reference Type | External, Internal | External, Internal | Reference flexibility affects accuracy and board-level design; both supporting internal and external references preserves design options. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD974ARSZ | AD9740ARURL7 |
|---|---|---|
| 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 AD9740ARURL7 functionally equivalent and interchangeable?
No. The AD974ARSZ is a 4-channel, 16-bit serial 200 kSPS ADC in a 28-lead SSOP package, while the AD9740ARURL7 is a single-channel, 10-bit, 210 MSPS TxDAC+ digital-to-analog converter in a 28-lead TSSOP package. They differ in function (ADC vs DAC), resolution, channel count, and package, so they are not interchangeable.
What are the core resolution and channel-count differences between the AD974ARSZ and AD9740ARURL7?
The AD974ARSZ provides 16-bit resolution across four simultaneously sampled input channels. The AD9740ARURL7 provides 10-bit resolution on a single DAC output channel. These differences make them suited to entirely different signal-chain roles.
How do the sample/update rates of the two devices compare?
The AD974ARSZ is specified for a 200 kSPS maximum throughput rate as a serial ADC. The AD9740ARURL7 is specified for a 210 MSPS maximum update rate as a high-speed DAC. The AD9740ARURL7 therefore operates roughly three orders of magnitude faster in its conversion/update rate.
Do the AD974ARSZ and AD9740ARURL7 use the same package and pinout?
No. The AD974ARSZ is supplied in a 28-lead SSOP package, while the AD9740ARURL7 is supplied in a 28-lead TSSOP package. The pin functions and PCB land patterns differ, so neither footprint nor pinout is directly compatible.
What supply and interface characteristics distinguish the AD974ARSZ from the AD9740ARURL7?
The AD974ARSZ operates from a single 5 V supply and provides a serial digital interface for ADC output data. The AD9740ARURL7 operates from a 2.7 V to 3.6 V supply and accepts a parallel 10-bit CMOS-compatible input word for DAC updating. These supply and interface differences must be considered in any system design.
Can the AD974ARSZ and AD9740ARURL7 be used together in the same signal chain?
Yes, they can serve complementary roles: the AD974ARSZ can digitize analog inputs at 16-bit resolution and 200 kSPS, while the AD9740ARURL7 can reconstruct analog waveforms at 10-bit resolution and up to 210 MSPS. They are not substitutes for one another but can coexist in a mixed-signal system where both ADC and DAC functions are required.
Which device should be selected for high-speed waveform generation versus precision multi-channel acquisition?
For high-speed waveform generation, the AD9740ARURL7 is the appropriate choice given its 210 MSPS update rate and 10-bit DAC output. For precision multi-channel acquisition, the AD974ARSZ is appropriate given its 16-bit resolution and four simultaneously sampled input channels at 200 kSPS.