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 AD9742ARURL7 are not functionally interchangeable: they differ in resolution, digital interface, sampling rate, and package footprint, so substituting one for the other requires a full board and firmware redesign rather than a direct swap.
Different resolution
Different digital interface
Different sampling rate
Different package footprint
Parts at a glance
Part B
AD9742ARURL7
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 4486 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 | AD9742ARURL7 | Why it matters |
|---|---|---|---|
| Resolution | 10 bit | 12 bit | Higher resolution provides finer output granularity and lower quantization error, so the two parts are not functionally equivalent in precision-critical designs. |
| Number of DAC Channels | 1 | 1 | Both are single-channel DACs, so channel count does not differentiate them for substitutability. |
| Update Rate (Sample Rate) | 210 MSPS | 210 MSPS | Matching maximum update rates allow similar signal bandwidth and dynamic performance in high-speed applications. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Identical current-output architecture means the same external output stage and termination network can be reused. |
| Supply Voltage | 2.7 V to 3.6 V | 2.7 V to 3.6 V | Same supply range allows drop-in use in the same power rail design without level shifting. |
| Package / Case | 28-SSOP | 28-TSSOP | Different package footprints require PCB layout changes, affecting direct board-level substitution. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical temperature ratings ensure equivalent environmental robustness for industrial applications. |
| Interface Type | Parallel | Parallel | Same parallel interface simplifies digital host connection and firmware compatibility. |
| Mounting Type | Surface Mount | Surface Mount | Both are surface-mount devices, consistent with modern SMT assembly processes. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD974ARSZ | AD9742ARURL7 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Series | - | TxDAC® |
| Part Status | Active | Obsolete |
| Number of Bits | - | 12 |
| Number of D/A Converters | - | 1 |
| Settling Time | - | 11ns (Typ) |
| Output Type | - | Current - Unbuffered |
| Differential Output | - | Yes |
| Data Interface | Serial | Parallel |
| Reference Type | - | External, Internal |
| Voltage - Supply, Analog | - | 2.7V ~ 3.6V |
| Voltage - Supply, Digital | - | 2.7V ~ 3.6V |
| INL / DNL(LSB) | - | ±0.5, ±0.4 |
| Architecture | - | Current Source |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Type | Data Acquisition System (DAS) | - |
| Number of Channels | 4 | - |
| Resolution(Bits) | 16 b | - |
| Sampling Rate(Per Second) | 200k | - |
| Voltage Supply Source | Analog and Digital | - |
| Voltage - Supply | 4.75V ~ 5.25V | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
Are the AD974ARSZ and AD9742ARURL7 functionally interchangeable?
No. The AD974ARSZ is a 4-channel, 16-bit, 200 kSPS successive-approximation ADC in a 28-lead SSOP package, while the AD9742ARURL7 is a 12-bit, 210 MSPS TxDAC digital-to-analog converter in a 28-lead TSSOP package. They differ in resolution, conversion architecture, sample rate, and primary function (ADC versus DAC), so they are not interchangeable.
What are the key resolution and speed differences between the AD974ARSZ and AD9742ARURL7?
The AD974ARSZ provides 16-bit resolution at a maximum throughput of 200 kSPS. The AD9742ARURL7 provides 12-bit resolution at an update rate of up to 210 MSPS. The AD974ARSZ is optimized for high-accuracy, low-speed data acquisition, while the AD9742ARURL7 is optimized for high-speed signal synthesis.
Do the AD974ARSZ and AD9742ARURL7 use the same package and pinout?
No. The AD974ARSZ is supplied in a 28-lead SSOP (RS-28) package, and the AD9742ARURL7 is supplied in a 28-lead TSSOP (RU-28) package. The package body dimensions and PCB land patterns differ, and the pin functions are not equivalent because one device is an ADC and the other is a DAC.
What are the supply voltage requirements for each device?
The AD974ARSZ operates from a single 5 V analog supply (AVDD) with a separate digital supply (DVDD) of 5 V, and it includes an on-chip 2.5 V reference. The AD9742ARURL7 operates from a single 2.7 V to 3.6 V supply and includes an internal 1.2 V reference. The supply rails and reference architecture are therefore not compatible.
What are the typical applications for the AD974ARSZ versus the AD9742ARURL7?
The AD974ARSZ is intended for high-resolution, low-frequency data acquisition such as industrial process control, instrumentation, and medical monitoring. The AD9742ARURL7 is intended for high-speed signal synthesis such as communications transmit paths, base stations, and direct digital synthesis (DDS) applications.
Can the AD9742ARURL7 be used as a drop-in replacement for the AD974ARSZ on an existing PCB?
No. Beyond the functional difference (DAC versus ADC), the AD9742ARURL7 uses a TSSOP package rather than the SSOP package of the AD974ARSZ, and the pin assignments, supply voltages, and interface timing are different. A direct drop-in replacement is not possible without a redesign.
What digital interface does each device provide?
The AD974ARSZ provides a parallel 16-bit digital output interface for reading conversion results. The AD9742ARURL7 provides a parallel 12-bit digital input interface for writing DAC codes. The data bus widths and directions differ, so they cannot share the same interface without adaptation.