Part A
AD7490BRU
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2930 PCS
- Package
- TSSOP-28
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7490BRU and AD7492BRU share the same 12-bit SAR architecture, 24-lead TSSOP footprint, and serial interface family, making them functionally related candidates. However, the AD7490BRU provides 16 input channels versus a single channel on the AD7492BRU, and the two devices differ in throughput rate and power consumption. Designers must validate channel-count requirements, sampling rate headroom, and power budget before substituting one for the other in a given application.
Resolution
High match
Package Type
High match
Channel Count
Validation required
Throughput Rate
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7490BRU | AD7492BRU | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so quantization accuracy is equivalent and neither offers a resolution advantage for substitutability. |
| Number of Input Channels | 16 (single-ended) | 1 (single-ended) | The AD7490 is a 16-channel multiplexed ADC while the AD7492 is a single-channel device; this is the most significant functional difference and prevents direct substitution in multi-channel systems. |
| Sampling Rate | 1 MSPS | 1.25 MSPS | The AD7492 offers a higher maximum throughput, which matters for applications requiring faster conversion of high-frequency signals. |
| Input Type | Single-ended | Single-ended | Both accept single-ended inputs, so signal conditioning requirements are similar for either part. |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Identical supply range means both can operate from the same system rails without level shifting. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible serial | SPI / QSPI / MICROWIRE / DSP compatible serial | Matching serial interfaces allow either device to connect to the same digital host without protocol changes. |
| Package | 24-lead TSSOP | 24-lead TSSOP | Same package and pin count simplify PCB layout changes, though pin functions differ due to channel count. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature ratings mean both suit the same environmental conditions. |
| Power Consumption | Approx. 2.5 mW at 1 MSPS (5 V) | Approx. 3.5 mW at 1.25 MSPS (5 V) | Lower power per conversion favors the AD7490 in power-sensitive designs, while the AD7492 trades slightly higher power for higher throughput. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7490BRU | AD7492BRU |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Obsolete | 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 primary differences between the AD7490BRU and AD7492BRU?
The AD7490BRU is a 12-bit, 16-channel successive-approximation ADC with a serial interface, housed in a 28-lead TSSOP. The AD7492BRU is a 12-bit, 4-channel successive-approximation ADC with a parallel interface, housed in a 24-lead TSSOP. The key differences are channel count (16 vs 4) and digital interface type (serial vs parallel).
Do the AD7490BRU and AD7492BRU have the same resolution and sampling rate?
Both devices provide 12-bit resolution. The AD7490BRU offers a throughput rate of up to 1 MSPS, while the AD7492BRU offers a throughput rate of up to 1.25 MSPS, per the respective Analog Devices datasheets.
Are the AD7490BRU and AD7492BRU pin-compatible?
No. The AD7490BRU is supplied in a 28-lead TSSOP and the AD7492BRU in a 24-lead TSSOP, so the package footprints and pin counts differ. They are not drop-in replacements for one another.
What digital interface does each device use?
The AD7490BRU uses a serial interface (SPI/QSPI/MICROWIRE/DSP-compatible). The AD7492BRU uses a parallel interface for direct connection to a microprocessor or DSP data bus.
What are the analog input configurations of the AD7490BRU and AD7492BRU?
The AD7490BRU provides 16 single-ended analog input channels (configurable via its sequencer). The AD7492BRU provides 4 single-ended analog input channels. Both operate from a single 2.7 V to 5.25 V supply per the datasheets.
Can the AD7492BRU be used as a replacement for the AD7490BRU in an existing design?
Not directly. The AD7492BRU has fewer channels (4 vs 16), a different package (24-lead vs 28-lead TSSOP), and a parallel rather than serial interface. A redesign of the PCB, channel multiplexing, and digital interface would be required.
Which device is better suited for high-channel-count multiplexed systems?
The AD7490BRU is better suited because it integrates a 16-channel sequencer and serial interface, reducing pin count and board space in multi-channel data-acquisition systems. The AD7492BRU's 4 channels and parallel bus suit lower-channel-count, high-speed parallel-bus applications.