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 AD7492ARU share the same 12-bit SAR ADC core, 24-lead TSSOP footprint, and 2.7 V to 5.25 V supply range, making them viable functional candidates in the same signal chain. However, the AD7490BRU provides 16 input channels with a 1 MSPS throughput, while the AD7492ARU offers a single-channel 1.25 MSPS conversion path, so channel count and per-channel timing must be validated against the target application before substitution.
Channel Count
Validation required
Sample Rate
Validation required
Package Type
High match
Supply Voltage Range
High match
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 | AD7492ARU | Why it matters |
|---|---|---|---|
| Number of ADC Channels | 16 | 1 | Determines how many analog signals can be sampled; a 16-channel multiplexed ADC versus a single-channel ADC fundamentally changes system architecture and cannot be directly substituted. |
| Resolution | 12 bits | 12 bits | Both provide 12-bit resolution, so quantization accuracy is equivalent, which is favorable for substitutability in terms of measurement precision. |
| Sampling Rate | 1 MSPS | 1.25 MSPS | Maximum throughput affects the ability to capture fast-changing signals; the AD7492 offers a slightly higher conversion rate. |
| Input Type | Single-ended | Single-ended | Both accept single-ended inputs, so signal conditioning requirements are similar and no differential driver is needed for either. |
| 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 power rail, simplifying board-level replacement. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible | Parallel (byte/word) | The digital interface differs fundamentally (serial vs parallel), which affects pin count, microcontroller compatibility, and PCB routing, making direct substitution difficult. |
| Package | 24-lead TSSOP | 24-lead TSSOP | Same package footprint allows potential board-level compatibility, though pin functions differ due to interface differences. |
| Power Consumption | 2.5 mW typical at 1 MSPS | 3.5 mW typical at 1.25 MSPS | Lower power consumption favors the AD7490 in battery-powered or thermally constrained designs. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same industrial environments without derating concerns. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7490BRU | AD7492ARU |
|---|---|---|
| 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 AD7492ARU?
The AD7490BRU is a 12-bit, 16-channel successive approximation ADC with a maximum throughput of 1 MSPS, housed in a 28-lead TSSOP. The AD7492ARU is a 12-bit, 4-channel ADC with a maximum throughput of 1.25 MSPS, also in a 24-lead TSSOP. Key differences include channel count (16 vs 4), package pin count (28 vs 24), and maximum sampling rate (1 MSPS vs 1.25 MSPS).
Are the AD7490BRU and AD7492ARU pin-compatible?
No. The AD7490BRU uses a 28-lead TSSOP package, while the AD7492ARU uses a 24-lead TSSOP package. The different pin counts and pin functions prevent direct PCB footprint compatibility without layout changes.
Can the AD7492ARU be used as a drop-in replacement for the AD7490BRU?
No. Beyond package and pin count differences, the AD7490BRU provides 16 input channels versus 4 channels on the AD7492ARU, and the maximum throughput differs (1 MSPS vs 1.25 MSPS). A direct substitution is not possible without design validation against the manufacturer datasheets.
What is the resolution and architecture of both devices?
Both the AD7490BRU and AD7492ARU are 12-bit successive approximation register (SAR) analog-to-digital converters manufactured by Analog Devices.
How do the input channel configurations compare?
The AD7490BRU offers 16 single-ended input channels (configurable as 8 pseudo-differential pairs). The AD7492ARU provides 4 single-ended input channels. Designs requiring more analog inputs should account for this difference.
What are the maximum sampling rates of these ADCs?
The AD7490BRU has a maximum throughput rate of 1 MSPS. The AD7492ARU has a maximum throughput rate of 1.25 MSPS. Both figures are specified in the respective Analog Devices datasheets.
Do both parts support the same digital interface?
Both devices provide a high-speed serial interface compatible with SPI/QSPI/MICROWIRE/DSP protocols. However, the exact timing, register configuration, and channel addressing differ due to the different channel counts, so firmware must be adapted accordingly.
What are the package and operating temperature specifications?
The AD7490BRU is supplied in a 28-lead TSSOP, and the AD7492ARU in a 24-lead TSSOP. Both are specified for the industrial temperature range of −40°C to +85°C per their Analog Devices datasheets.