Part A
AD974ARSZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5700 Stückzahl
- Package
- SSOP-28
- Series
- Datenerfassung von ADCs-DACs für besonderen Zweck
Replacement verdict
Not a drop-in replacement
The AD974ARSZ and AD9742ARZRL are not drop-in replacements for one another. Although both are 14-bit high-speed DACs from Analog Devices, they belong to different converter families with differing resolution-to-speed tradeoffs, supply and reference architectures, and dynamic performance characteristics. The AD974ARSZ operates at a lower update rate with a different digital interface timing profile, while the AD9742ARZRL offers a higher conversion rate and distinct output compliance behavior. Board-level validation of timing, reference, and output filtering is required before any substitution.
Different converter family
Different update rate
Different reference architecture
Different dynamic performance
Parts at a glance
Part B
AD9742ARZRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 787 Stückzahl
- Package
- SOIC-28
- Series
- Data Acquisition von Digital to Analog Converters (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 | AD9742ARZRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 12 bit | Resolution determines the number of discrete output levels; a 16-bit DAC offers far finer granularity than a 12-bit DAC, so they are not functionally interchangeable in precision applications. |
| Number of D/A Converters | 4 | 1 | The AD974ARSZ integrates four DAC channels while the AD9742ARZRL provides a single channel, which fundamentally changes the channel count available to the system design. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Both devices provide unbuffered current outputs, so external output amplifiers are required in either case; this parameter is consistent between the two parts. |
| Data Interface | Parallel | Parallel | Both use a parallel digital interface, meaning the host must supply a parallel bus; the interface style is compatible between the two parts. |
| Supply Voltage | 5V | 2.7V to 3.6V | The AD974ARSZ operates from a 5V supply while the AD9742ARZRL runs on a 2.7V to 3.6V supply, so power-rail compatibility must be verified before substitution. |
| Package / Case | 28-SSOP | 28-SSOP | Both devices are offered in a 28-lead SSOP package, so the footprint and board layout are compatible between the two parts. |
| Mounting Type | Surface Mount | Surface Mount | Both are surface-mount devices, so assembly processes and board attachment methods are the same. |
| Operating Temperature | -40°C to 85°C | -40°C to 85°C | Both parts share the same industrial temperature range, so environmental operating limits are equivalent. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD974ARSZ | AD9742ARZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Series | - | TxDAC® |
| Part Status | Active | Active |
| 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 AD9742ARZRL interchangeable in an existing design?
No, they are not directly interchangeable. The AD974ARSZ is a 4-channel, 16-bit, 200 kSPS serial ADC in a 28-lead SSOP package, while the AD9742ARZRL is a single-channel, 12-bit, 210 MSPS TxDAC digital-to-analog converter in a 28-lead SOIC package. They differ in function (ADC vs DAC), resolution, channel count, speed, and package footprint, so a direct substitution is not possible.
What are the core functional differences between the AD974ARSZ and AD9742ARZRL?
The AD974ARSZ is an analog-to-digital converter that digitizes four single-ended input channels with 16-bit resolution at up to 200 kSPS. The AD9742ARZRL is a digital-to-analog converter that converts a 12-bit digital input into an analog output current at update rates up to 210 MSPS. One converts analog signals to digital data; the other converts digital data to an analog signal.
Do the AD974ARSZ and AD9742ARZRL use the same package and pinout?
No. The AD974ARSZ is supplied in a 28-lead SSOP (Shrink Small Outline Package), while the AD9742ARZRL is supplied in a 28-lead SOIC (Small Outline Integrated Circuit) package. The package body dimensions, lead pitch, and PCB land patterns differ, so they are not footprint-compatible and cannot share the same board layout without redesign.
What are the resolution and sampling/update rate specifications for each part?
The AD974ARSZ provides 16-bit resolution with a maximum throughput of 200 kSPS. The AD9742ARZRL provides 12-bit resolution with a maximum update rate of 210 MSPS. These specifications reflect fundamentally different data converter roles and cannot be compared on a like-for-like basis.
What supply voltages and interfaces do the AD974ARSZ and AD9742ARZRL require?
The AD974ARSZ operates from a single 5 V analog supply and provides a serial digital interface for output data. The AD9742ARZRL operates from a 3.0 V to 3.6 V supply and accepts a parallel 12-bit digital input word. Because supply rails and digital interface types differ, the surrounding circuitry and host interface must be designed specifically for each device.
Can the AD9742ARZRL replace the AD974ARSZ in a signal acquisition path?
No. The AD9742ARZRL is a DAC and cannot perform the analog-to-digital conversion function of the AD974ARSZ. Replacing an ADC with a DAC would invert the signal flow and is not functionally valid. Any replacement must match the converter type, resolution, channel count, and interface of the original device.
Which part should be selected for a high-speed transmit path versus a multi-channel acquisition path?
For a high-speed transmit path requiring digital-to-analog conversion at update rates up to 210 MSPS, the AD9742ARZRL is the appropriate choice. For a multi-channel acquisition path requiring 16-bit analog-to-digital conversion of up to four channels at 200 kSPS, the AD974ARSZ is the appropriate choice. Selection should be based on the signal direction, resolution, channel count, and speed requirements of the application.