Part A
AD7490BRUZ
ADI公司
- Lifecycle
- Active
- Stock
- 2333 件
- Package
- TSSOP-28
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Not a drop-in replacement
The AD7490BRUZ and AD7492BRU-5 are not drop-in replacements for one another. Although both are 12-bit successive-approximation ADCs from Analog Devices, they differ in channel count, digital interface, conversion throughput, and package footprint, so a direct board-level substitution is not possible without redesign.
Different channel count
Different digital interface
Different throughput
Different package footprint
Parts at a glance
Part B
AD7492BRU-5
ADI公司
- Lifecycle
- Active
- Stock
- 7623 件
- Package
- TSSOP-24
- Series
- 資料獲取-模數轉換器（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 | AD7492BRU-5 | Why it matters |
|---|---|---|---|
| Number of ADC Channels | 16 (single-ended) | 1 (single-ended) | Channel count determines how many analog signals can be sampled; a 16-channel part cannot be directly substituted where a single-channel converter is required, and vice versa. |
| Resolution | 12 bits | 12 bits | Resolution sets the smallest measurable signal step; both are 12-bit, so quantization performance is comparable. |
| Maximum Sampling Rate | 1 MSPS | 1.25 MSPS | Sampling rate limits the maximum input signal bandwidth that can be captured; the AD7492 offers a slightly higher throughput. |
| Supply Voltage | 2.7 V to 5.25 V | 5 V (4.75 V to 5.25 V) | Supply range affects compatibility with the system rail; the AD7490 supports lower-voltage operation while the AD7492 is a 5 V-only device. |
| Digital Interface | SPI / QSPI / MICROWIRE / DSP compatible serial | Parallel (12-bit word) | The interface type dictates the host connection and firmware; serial versus parallel output is a fundamental architectural difference affecting board layout and microcontroller pin usage. |
| Input Type | Single-ended | Single-ended | Input configuration determines how the analog source is connected; both accept single-ended signals, so signal conditioning requirements are similar. |
| Package | 24-lead TSSOP | 24-lead TSSOP | Package footprint affects PCB layout and assembly; identical TSSOP-24 packages allow the same land pattern but do not guarantee pin compatibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range defines the environments in which the part is guaranteed to meet specifications; both cover the industrial range. |
| Reference | Internal 2.5 V reference (with external option) | Internal 2.5 V reference (with external option) | Reference source affects accuracy and external component count; both provide an on-chip reference, simplifying the analog front end. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7490BRUZ | AD7492BRU-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 AD7492BRU-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 AD7492BRU-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 AD7492BRU-5 offers fewer channels with a parallel interface and integrated reference.
Can the AD7490BRUZ and AD7492BRU-5 be used as direct drop-in replacements for each other?
No. The two devices differ in package pin count (28-lead TSSOP vs 24-lead TSSOP), interface type (serial vs parallel), channel count (16 vs 4), and reference architecture. They are not pin-compatible or functionally interchangeable without redesign of the host interface, PCB footprint, and reference circuitry.
What are the analog input configurations of each device?
The AD7490BRUZ provides 16 single-ended analog input channels, configurable via the control register, and supports channel sequencing. The AD7492BRU-5 provides 4 single-ended analog input channels. Both are 12-bit successive approximation ADCs, but the AD7490's higher channel count suits multi-channel monitoring, while the AD7492BRU-5 suits lower-channel-count applications.
How do the digital interfaces of the AD7490BRUZ and AD7492BRU-5 differ?
The AD7490BRUZ uses a serial interface compatible with SPI, QSPI, MICROWIRE, and DSP protocols, reducing pin count and supporting daisy-chaining. The AD7492BRU-5 uses a parallel microprocessor interface with a chip select and read/write control, providing higher throughput to the host but requiring more I/O pins. Interface selection should be based on host controller resources and board layout constraints.
Do both devices include an on-chip voltage reference?
The AD7492BRU-5 includes an on-chip 2.5 V reference, which can be used for the conversion or overdriven by an external reference. The AD7490BRUZ requires an external reference voltage applied to the REFIN pin; it does not include an internal reference. This difference affects external component count and reference accuracy budgeting.
What are the supply voltage and throughput considerations for these ADCs?
Both devices operate from a single 2.7 V to 5.25 V supply. The AD7490BRUZ achieves throughput rates up to 1 MSPS, while the AD7492BRU-5 achieves throughput rates up to 1.25 MSPS. Actual achievable throughput depends on interface timing, reference settling, and host read timing; consult the respective manufacturer datasheets for derating under specific conditions.
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 sequencer support and a serial interface that minimizes host pin usage. The AD7492BRU-5, with 4 channels and a parallel interface, is better suited to applications requiring fewer channels and faster host-side data transfer. Selection should be based on channel count, interface availability, and reference requirements.