Part A
AD7890ARZ-10
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6285 Stückzahl
- Package
- SOIC-24
- Series
- Datenerfassung von ADCs-DACs für besonderen Zweck
Replacement verdict
Not a drop-in replacement
The AD7890ARZ-10 and AD7892BR-2 are not drop-in replacements for one another. Although both are Analog Devices 12-bit successive-approximation ADCs, they differ in channel architecture, analog input configuration, digital interface, and package footprint, so a direct board-level substitution is not possible without redesign.
Different channel architecture
Different input configuration
Different digital interface
Different package footprint
Parts at a glance
Part B
AD7892BR-2
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9420 Stückzahl
- Package
- SOIC-24
- Series
- Datenerfassung mit 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 | AD7890ARZ-10 | AD7892BR-2 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so nominal quantization resolution is equivalent for substitutability. |
| Number of ADC Inputs / Channels | 8 channels (single-ended, multiplexed) | 1 channel (single-ended) | The AD7890 provides an 8-channel multiplexer front end, while the AD7892 is a single-channel device; this fundamentally changes system architecture and channel count. |
| Sampling Rate | 105 kSPS | 500 kSPS | The AD7892 supports a much higher throughput, which matters for faster signal acquisition and anti-alias filter design. |
| Input Voltage Range | ±10 V | ±2.5 V | Different full-scale input ranges affect signal conditioning, front-end scaling, and compatibility with the sensor or source. |
| Interface Type | Serial (SPI/QSPI compatible) | Parallel | Serial versus parallel interface changes the digital host connection, pin count, and firmware/FPGA glue logic. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Both operate from a 5 V supply, so power rail requirements are compatible. |
| Package / Mounting | 24-lead SOIC (surface mount) | 24-lead SOIC (surface mount) | Matching package and mounting style simplifies PCB footprint reuse, though pinouts differ. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature ranges mean both suit the same environmental conditions. |
| Internal Reference | Yes (internal reference) | Yes (internal reference) | Both include an on-chip reference, reducing external component count and simplifying design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7890ARZ-10 | AD7892BR-2 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | - | 12 |
| Sampling Rate(Per Second) | 117k | 500k |
| Number of A/D Converters | - | 1 |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Type | Data Acquisition System (DAS) | - |
| Number of Channels | 8 | - |
| Resolution(Bits) | 12 b | - |
| Data Interface | SPI | - |
| Voltage Supply Source | Single Supply | - |
| Voltage - Supply | 5V | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
What are the primary functional differences between the AD7890ARZ-10 and the AD7892BR-2?
The AD7890ARZ-10 is an 8-channel, 12-bit data acquisition system (DAS) with a serial interface and a 10 µs conversion time. The AD7892BR-2 is a single-channel, 12-bit successive-approximation ADC with a parallel interface and a 1.47 µs conversion time. The AD7890 integrates an input multiplexer and track-and-hold for multi-channel systems, while the AD7892 is optimized for high-speed single-channel sampling.
Are the AD7890ARZ-10 and AD7892BR-2 pin-compatible or package-compatible?
No. The AD7890ARZ-10 is supplied in a 24-lead SOIC (RW-24) package, whereas the AD7892BR-2 is supplied in a 24-lead SOIC (R-24) package. Although both are 24-lead SOIC devices, their pin functions and internal architectures differ, so they are not direct drop-in replacements for each other.
What are the analog input voltage ranges for each device?
The AD7890ARZ-10 accepts a 0 V to +2.5 V unipolar analog input range (the "-10" suffix denotes a 10 V reference-based input span configuration per the datasheet ordering guide). The AD7892BR-2 accepts a ±2.5 V bipolar analog input range (the "-2" suffix denotes the ±2.5 V input range option).
How do the digital interfaces of the AD7890ARZ-10 and AD7892BR-2 differ?
The AD7890ARZ-10 provides a serial interface for connection to microcontrollers and DSPs, reducing pin count and board routing. The AD7892BR-2 provides a parallel interface for direct connection to a microprocessor bus, enabling higher throughput data reads at the expense of additional pins.
What are the maximum throughput rates of the AD7890ARZ-10 and AD7892BR-2?
The AD7890ARZ-10 has a 10 µs conversion time, supporting throughput up to approximately 100 kSPS. The AD7892BR-2 has a 1.47 µs conversion time, supporting throughput up to 500 kSPS. The AD7892 is therefore better suited for higher-speed single-channel acquisition.
Can the AD7890ARZ-10 and AD7892BR-2 operate from the same supply voltage?
Yes. Both devices operate from a single +5 V supply. The AD7890ARZ-10 requires a +5 V supply with an external reference (typically 2.5 V), while the AD7892BR-2 operates from a +5 V supply and includes an on-chip reference. Designers should verify decoupling and reference configuration per each datasheet.
Which device is more suitable for multi-channel data acquisition systems?
The AD7890ARZ-10 is more suitable for multi-channel systems because it integrates an 8-channel input multiplexer, track-and-hold, and 12-bit ADC in a single package, reducing external component count. The AD7892BR-2 is a single-channel ADC and would require external multiplexing for multi-channel applications.
Do the AD7890ARZ-10 and AD7892BR-2 share the same operating temperature range?
Both devices are specified for the industrial temperature range of -40°C to +85°C. The "A" and "B" grade designations refer to performance grades (linearity and accuracy specifications), not temperature range, so both parts are rated for industrial-temperature operation.