Part A
AD7490BRUZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 2333 PCS
- Package
- TSSOP-28
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The AD7490BRUZ and AD7492ARU-5 are not drop-in replacements for one another. The AD7490BRUZ is a 16-channel, 12-bit successive-approximation ADC with a serial SPI/QSPI/MICROWIRE/DSP-compatible interface, while the AD7492ARU-5 is a single-channel, 12-bit ADC with a parallel interface and an on-chip reference. Their channel count, digital interface, package pinout, and reference architecture differ fundamentally, so substituting one for the other requires a full board redesign and firmware rework rather than a direct swap.
Different channel count
Different digital interface
Different package pinout
Different reference architecture
Parts at a glance
Part B
AD7492ARU-5
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 7983 PCS
- Package
- TSSOP-24
- Series
- Acquisition de données - Convertisseur analogique - numérique (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-5 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both converters provide 12-bit resolution, so measurement precision is equivalent. |
| Number of ADC Inputs / Channels | 16 single-ended (multiplexed) | 1 single-ended | The AD7490 can scan many channels while the AD7492 handles only one, which fundamentally changes system architecture and channel count. |
| Sampling Rate | 1 MSPS | 1.25 MSPS | Maximum throughput affects how fast signals can be captured; the AD7492 samples slightly faster. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible serial | Parallel (byte/word) | Serial versus parallel interface determines pin count, host controller requirements, and board routing complexity. |
| Supply Voltage | 2.7 V to 5.25 V | 5 V | The AD7490 supports lower supply rails, enabling 3.3 V systems, while the AD7492 requires a 5 V supply. |
| Analog Input Type | Single-ended | Single-ended | Both accept single-ended inputs, so signal conditioning topology is similar. |
| Package | 24-lead TSSOP | 24-lead TSSOP | Identical package and footprint allow drop-in board compatibility without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching industrial temperature ranges mean both suit the same environmental conditions. |
| Power Consumption | Approx. 2.5 mW at 1 MSPS (5 V) | Approx. 15 mW at 1.25 MSPS (5 V) | Lower power dissipation in the AD7490 benefits battery-powered and thermally constrained designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7490BRUZ | AD7492ARU-5 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 1M | 1.25M |
| Data Interface | SPI, DSP | Parallel |
| Number of A/D Converters | 1 | 1 |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Number of Inputs | 16 | - |
| Input Type | Single Ended | - |
| Configuration | MUX-S/H-ADC | - |
| Ratio - S / H: ADC | 1:1 | - |
| Architecture | SAR | - |
| Reference Type | External | - |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | - |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | - |
Frequently asked questions
What are the key architectural differences between the AD7490BRUZ and the AD7492ARU-5?
The AD7490BRUZ is a 12-bit, 16-channel successive approximation ADC with a serial SPI/QSPI/MICROWIRE/DSP-compatible interface, housed in a 28-lead TSSOP. The AD7492ARU-5 is a 12-bit, 4-channel successive approximation ADC with a parallel interface and an on-chip 2.5 V reference, housed in a 24-lead TSSOP. The AD7490 offers more input channels and a serial interface, while the AD7492ARU-5 provides fewer channels with a parallel interface and integrated reference.
Are the AD7490BRUZ and AD7492ARU-5 pin-compatible?
No. The AD7490BRUZ is supplied in a 28-lead TSSOP, while the AD7492ARU-5 is supplied in a 24-lead TSSOP. The differing package sizes and pin counts mean the two devices are not pin-compatible and cannot be interchanged on the same PCB footprint without redesign.
How do the sampling rates of the AD7490BRUZ and AD7492ARU-5 compare?
The AD7490BRUZ offers a throughput rate of up to 1 MSPS. The AD7492ARU-5 offers a throughput rate of up to 1.25 MSPS. The AD7492ARU-5 therefore provides a higher maximum sampling rate, while the AD7490BRUZ trades some speed for a greater number of input channels.
What input channel counts and configurations do these two ADCs support?
The AD7490BRUZ provides 16 analog input channels that can be configured as single-ended inputs or as pairs in pseudo-differential mode, selectable via the channel address bits in the control register. The AD7492ARU-5 provides 4 analog input channels. Designs requiring many multiplexed inputs favor the AD7490BRUZ, while the AD7492ARU-5 suits applications needing fewer channels.
What digital interfaces do the AD7490BRUZ and AD7492ARU-5 use?
The AD7490BRUZ uses a serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards, which reduces pin count and suits isolated or space-constrained designs. The AD7492ARU-5 uses a parallel microprocessor-compatible interface, which can provide higher data throughput to a host controller but requires more I/O pins.
Do the AD7490BRUZ and AD7492ARU-5 differ in on-chip reference provision?
Yes. The AD7492ARU-5 includes an on-chip 2.5 V reference, which can simplify the analog front end by reducing external component count. The AD7490BRUZ does not include an on-chip reference and requires an external reference voltage to be supplied to the REF IN pin for ratiometric or absolute measurement operation.
What are the analog supply voltage requirements for the AD7490BRUZ and AD7492ARU-5?
Both devices operate from a single 2.7 V to 5.25 V analog supply (VDD). The AD7490BRUZ also provides a separate VDRIVE pin that sets the digital interface logic level, allowing direct connection to 3 V or 5 V processors. The AD7492ARU-5 is specified with a 5 V supply variant (the -5 suffix) and its parallel interface logic levels are referenced to its supply.
Which device is better suited for multi-channel data acquisition systems?
The AD7490BRUZ is generally better suited for multi-channel data acquisition because it provides 16 input channels with a flexible channel sequencer and a serial interface that minimizes pin count and simplifies isolation. The AD7492ARU-5, with only 4 channels and a parallel interface, is better suited to lower-channel-count, higher-throughput applications where a parallel bus is available.