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
AD974ARSZ and AD9744AR are not drop-in replacements for one another. Although both are 14-bit current-output digital-to-analog converters, they differ in resolution-adjacent architecture, package footprint, and interface timing, so substituting one for the other requires board-level redesign and validation rather than direct replacement.
Different package footprint
Different interface timing
Different reference architecture
Different supply configuration
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 | AD9744AR | Why it matters |
|---|---|---|---|
| Resolution | 10 bit | 14 bit | Higher resolution provides finer quantization and lower quantization noise, directly affecting signal fidelity and dynamic performance. |
| Number of DAC Channels | 1 | 1 | Both are single-channel DACs, so channel count is not a differentiator for substitutability. |
| Update Rate (Max) | 210 MSPS | 210 MSPS | Maximum sample rate determines the highest signal bandwidth the DAC can synthesize; matching rates support similar applications. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Current-output DACs require an external I/V stage; identical output topology simplifies circuit reuse. |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | Matching supply ranges allow the same power rail design and level-shifting circuitry to be reused. |
| Package / Case | 28-SSOP | 28-SSOP | Identical package and pinout enable drop-in board replacement without layout changes. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Same temperature range ensures equivalent environmental robustness for industrial applications. |
| Interface | Parallel | Parallel | A parallel interface with matching timing simplifies FPGA/controller integration and firmware reuse. |
| Settling Time | 11 ns | 11 ns | Settling time affects achievable update rates and distortion at high frequencies; equal values indicate comparable dynamic behavior. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD974ARSZ | AD9744AR |
|---|---|---|
| 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 AD9744AR interchangeable in an existing design?
No, they are not directly interchangeable. The AD974ARSZ is a 4-channel, 14-bit, 200 kSPS successive-approximation ADC in a 28-lead SSOP package, while the AD9744AR is a single-channel, 14-bit, 210 MSPS current-output DAC in a 28-lead SOIC package. They differ in function (ADC vs DAC), channel count, speed, output type, and package footprint, so a direct substitution is not possible.
What are the core functional differences between the AD974ARSZ and AD9744AR?
The AD974ARSZ is an analog-to-digital converter that digitizes four single-ended input channels at up to 200 kSPS with 14-bit resolution. The AD9744AR is a digital-to-analog converter that converts a 14-bit digital word into a differential current output at update rates up to 210 MSPS. One converts analog inputs to digital data; the other converts digital data to an analog current output.
Do the AD974ARSZ and AD9744AR use the same package and pinout?
No. The AD974ARSZ is supplied in a 28-lead SSOP (Shrink Small Outline Package), while the AD9744AR is supplied in a 28-lead SOIC (Small Outline Integrated Circuit) package. The package body dimensions, lead pitch, and pin assignments differ, so the PCB land patterns are not compatible.
What are the maximum sampling or update rates for each device?
The AD974ARSZ supports a maximum throughput of 200 kSPS. The AD9744AR supports a maximum update rate of 210 MSPS. These rates reflect fundamentally different operating domains: the ADC is intended for low-speed multi-channel data acquisition, while the DAC is intended for high-speed signal synthesis.
What output or input interface does each device provide?
The AD974ARSZ provides a parallel digital output interface for its 14-bit conversion results and accepts four single-ended analog voltage inputs. The AD9744AR accepts a 14-bit parallel digital input and provides a differential current output (IOUTA and IOUTB) intended to drive a resistive load or transformer-coupled stage.
Can the AD974ARSZ and AD9744AR share the same power supply rail?
Both devices operate from a nominal 5 V analog supply, but their supply current, internal architecture, and decoupling requirements differ. The AD974ARSZ is a switched-capacitor SAR ADC, while the AD9744AR is a high-speed current-steering DAC. Each datasheet specifies its own recommended supply voltage range, decoupling network, and layout guidelines, so the power delivery should be designed per each device's datasheet rather than assumed identical.
Which device should be selected for a multi-channel data acquisition application?
The AD974ARSZ is the appropriate choice for multi-channel data acquisition because it integrates four 14-bit ADC channels in a single package at 200 kSPS. The AD9744AR is a single-channel DAC and does not perform analog-to-digital conversion, so it is not suitable for that function.
Which device should be selected for high-speed waveform generation?
The AD9744AR is the appropriate choice for high-speed waveform generation because it is a 14-bit, 210 MSPS current-output DAC designed for direct digital synthesis and signal reconstruction. The AD974ARSZ is a 200 kSPS ADC and cannot generate analog waveforms.