Part A
AD7490BRUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2333 Stückzahl
- Package
- TSSOP-28
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The AD7490BRUZ and AD7492ARU are not drop-in replacements for one another. The AD7490BRUZ is a 16-channel, 12-bit successive-approximation ADC in a 24-lead TSSOP, while the AD7492ARU is a single-channel, 12-bit ADC in a 24-lead TSSOP with a different serial interface and conversion architecture. Designers must account for differences in channel count, digital interface, throughput, and reference configuration before considering substitution.
Different channel count
Different digital interface
Different throughput
Different reference configuration
Parts at a glance
Part B
AD7492ARU
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8968 Stückzahl
- Package
- TSSOP-24
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7490BRUZ | AD7492ARU | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so they offer the same nominal measurement precision and quantization step size. |
| Number of Input Channels | 16 (single-ended) | 1 (single-ended) | The AD7490 is a multiplexed 16-channel device while the AD7492 is a single-channel part, which fundamentally changes system architecture and channel count. |
| Sampling Rate | 1 MSPS | 1.25 MSPS | Maximum throughput determines the highest signal bandwidth that can be digitized and affects timing budget in the application. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible serial | Parallel (12-bit word) | Serial versus parallel output dictates the host controller pin count, board routing, and firmware driver design. |
| Supply Voltage (Analog and Digital) | 2.7 V to 5.25 V | 5 V (4.75 V to 5.25 V) | Operating supply range affects compatibility with low-voltage logic and whether the part can run from a 3.3 V rail. |
| Package | 24-lead TSSOP | 24-lead TSSOP | Package footprint and pin count determine whether the parts are drop-in compatible on an existing PCB layout. |
| Input Type | Single-ended | Single-ended | Input configuration determines how the analog signal is connected and whether differential signal conditioning is required. |
| Reference Type | External | External | Both require an external voltage reference, so the reference design and accuracy budget must be provided externally in either case. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The industrial temperature range confirms suitability for the same environmental conditions in both parts. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7490BRUZ | AD7492ARU |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of Inputs | 16 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI, DSP | Parallel |
| Configuration | MUX-S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External | Internal |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key architectural differences between the AD7490BRUZ and the AD7492ARU?
The AD7490BRUZ is a 12-bit, 16-channel successive approximation register (SAR) ADC with a serial SPI/QSPI/MICROWIRE/DSP-compatible interface, housed in a 28-lead TSSOP. The AD7492ARU is a 12-bit, 4-channel SAR ADC with a parallel interface, housed in a 24-lead TSSOP. The AD7490 provides 16 single-ended or 8 pseudo-differential input channels, while the AD7492 provides 4 single-ended channels.
Are the AD7490BRUZ and AD7492ARU pin-compatible or footprint-compatible?
No. The AD7490BRUZ uses a 28-lead TSSOP package, and the AD7492ARU uses a 24-lead TSSOP package. The pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements and require separate PCB layouts.
How do the sampling rates of the AD7490BRUZ and AD7492ARU compare?
The AD7490BRUZ offers a throughput rate of up to 1 MSPS. The AD7492ARU offers a throughput rate of up to 1.25 MSPS. Both are 12-bit SAR converters, but the AD7492 provides a higher maximum sampling rate.
What interface types do the AD7490BRUZ and AD7492ARU use?
The AD7490BRUZ uses a serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards. The AD7492ARU uses a parallel microprocessor interface. This difference affects host controller selection, pin count, and firmware/software design.
How do the input channel configurations differ between the two devices?
The AD7490BRUZ provides 16 single-ended input channels, configurable as 8 pseudo-differential pairs. The AD7492ARU provides 4 single-ended input channels. The AD7490 is therefore suited to higher-channel-count multiplexed applications, while the AD7492 suits lower-channel-count designs.
Do the AD7490BRUZ and AD7492ARU operate from the same supply voltage?
Both devices operate from a single 2.7 V to 5.25 V supply, making them compatible with 3 V and 5 V systems. Designers should still verify the specific timing and reference requirements in each datasheet for the chosen supply voltage.
Can the AD7490BRUZ and AD7492ARU share the same external reference?
Both devices support an external reference voltage and include an on-chip reference option. The AD7490BRUZ and AD7492ARU each allow the reference to be configured for the full analog input range. The actual reference voltage and configuration must be verified against each datasheet for the target design.
Which device is more suitable for high-channel-count multiplexed systems?
The AD7490BRUZ is more suitable for high-channel-count systems because it provides 16 single-ended channels (or 8 pseudo-differential pairs) in a single package. The AD7492ARU provides only 4 single-ended channels, so it is better suited to lower-channel-count applications.