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 AD7490BRUZ and AD7490BRU are functionally equivalent 12-bit, 16-channel successive-approximation ADCs from Analog Devices, sharing the same core architecture, channel count, resolution, and serial interface. The primary distinction is the package finish: the AD7490BRUZ is the RoHS-compliant version, while the AD7490BRU is the non-RoHS legacy variant. For most new designs, the AD7490BRUZ is the preferred drop-in choice, and the AD7490BRU remains a viable substitute where non-RoHS inventory is acceptable.
Resolution and Channel Count
High match
Package Type
High match
Serial Interface
High match
RoHS Compliance
Validation required
Parts at a glance
Part B
AD7490BRUZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2333 PCS
- Package
- TSSOP-28
- Series
- Data Acquisition - 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 | AD7490BRU | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Determines the quantization step and achievable measurement precision; identical resolution means equivalent measurement granularity. |
| Number of Channels | 16 (single-ended) | 16 (single-ended) | Defines how many analog inputs can be multiplexed into the ADC; matching channel count preserves system input capacity. |
| Sampling Rate | 1 MSPS | 1 MSPS | Sets the maximum throughput for signal acquisition; identical rate ensures the same timing and bandwidth performance. |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Determines compatibility with the system power rail and logic levels; matching range allows drop-in use in the same supply design. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Defines the digital communication protocol with the host; identical interface ensures firmware and bus compatibility. |
| Package / Case | 28-TSSOP | 28-TSSOP | Determines PCB footprint and assembly compatibility; matching package allows the same board layout. |
| RoHS / Lead-Free Status | RoHS compliant, lead-free | Non-RoHS, contains lead | Affects regulatory compliance and solder process requirements; the lead-free variant is required for RoHS-restricted markets. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Defines the environmental envelope for reliable operation; matching range ensures equivalent thermal performance. |
| Input Type | Single-ended | Single-ended | Determines how analog signals are referenced and connected; identical input configuration preserves signal conditioning design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7490BRU | AD7490BRUZ |
|---|---|---|
| Part Status | Obsolete | Active |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 1M | 1M |
| Number of Inputs | 16 | 16 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI, DSP | SPI, DSP |
| Configuration | MUX-S/H-ADC | MUX-S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External | External |
| 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 is the difference between the AD7490BRUZ and the AD7490BRU?
The AD7490BRUZ and AD7490BRU are both 12-bit, 16-channel successive approximation ADCs from Analog Devices in a 28-lead TSSOP package. The primary difference is the suffix: the "Z" designation on the AD7490BRUZ indicates RoHS-compliant, lead-free construction, while the AD7490BRU is the non-RoHS (leaded) version. Both share the same core electrical specifications and functional behavior.
Are the AD7490BRUZ and AD7490BRU electrically and functionally interchangeable?
Yes. Both parts are specified as 12-bit, 16-channel ADCs with a throughput rate of up to 1 MSPS, a 2.7 V to 5.25 V supply range, and a serial SPI/QSPI/MICROWIRE/DSP-compatible interface. They share the same pinout and package footprint, so they are functionally interchangeable in a design; the difference is limited to RoHS/lead-free compliance.
Do the AD7490BRUZ and AD7490BRU have the same package and pinout?
Yes. Both devices are offered in the same 28-lead TSSOP (RU-28) package with an identical pin configuration, so the PCB land pattern and pin functions are the same for both variants.
Which part should be selected for a RoHS-compliant design?
The AD7490BRUZ should be selected for RoHS-compliant, lead-free designs, as indicated by the "Z" suffix in the Analog Devices part numbering. The AD7490BRU is the non-RoHS version and should not be used where lead-free/RoHS compliance is required.
What are the key shared specifications of the AD7490BRUZ and AD7490BRU?
Both are 12-bit, 16-channel successive approximation ADCs with up to 1 MSPS throughput, a 2.7 V to 5.25 V single-supply range, a serial interface compatible with SPI/QSPI/MICROWIRE/DSP, and operation over the industrial temperature range. These parameters are common to both variants per the Analog Devices datasheet.
Can the AD7490BRUZ be used as a drop-in replacement for the AD7490BRU?
Yes, from a functional and footprint standpoint the AD7490BRUZ can replace the AD7490BRU because both share the same package, pinout, and electrical specifications. The substitution changes the RoHS/lead-free status of the assembly, which should be confirmed against the target design's compliance requirements.
Does the "Z" suffix on the AD7490BRUZ affect electrical performance?
No. The "Z" suffix denotes RoHS-compliant, lead-free packaging and does not change the device's specified electrical performance. Both the AD7490BRUZ and AD7490BRU are specified to the same 12-bit resolution, 1 MSPS throughput, and supply/interface parameters in the Analog Devices datasheet.