Part A
AD7890ARZ-10
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6285 PCS
- Package
- SOIC-24
- Series
- Acquisição de dados - ADCs-DACs - Objetivo Especial
Replacement verdict
Compatible functional replacement candidate
The AD7890ARZ-10 and AD7890BR-2 are both 12-bit, 8-channel successive-approximation ADCs in the same 24-lead SOIC package with an identical serial interface and on-chip track-and-hold, making them functionally interchangeable in most designs. The primary distinction is speed and grade: the AD7890BR-2 offers a faster maximum throughput and a tighter linearity grade, while the AD7890ARZ-10 trades some conversion rate for a lower-cost grade. Designers should confirm that the system timing budget accommodates the slower ARZ-10 conversion rate and that the relaxed linearity specification remains acceptable for the target application before substituting.
Resolution and Architecture
High match
Package and Pinout
High match
Maximum Throughput Rate
Validation required
Linearity Grade
Validation required
Parts at a glance
Part B
AD7890BR-2
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 167 PCS
- Package
- SOIC-24
- Series
- Acquisição de dados - ADCs-DACs - Objetivo Especial
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 | AD7890BR-2 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so conversion resolution is identical and not a differentiator for substitutability. |
| Number of Input Channels | 8 (single-ended, multiplexed) | 8 (single-ended, multiplexed) | Channel count determines how many analog signals can be sampled; both provide 8 multiplexed inputs. |
| Sampling Rate | 105 kSPS | 105 kSPS | Throughput must meet the system's signal bandwidth requirements; both offer the same 105 kSPS maximum rate. |
| Input Voltage Range | ±10 V | ±2.5 V | The full-scale input range must match the sensor or signal amplitude; the -10 grade accepts ±10 V while the -2 grade accepts ±2.5 V, so they are not directly interchangeable without signal conditioning. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Supply compatibility affects board-level integration; both operate from a single 5 V supply. |
| Interface Type | Serial (SPI/QSPI compatible) | Serial (SPI/QSPI compatible) | The digital interface must match the host controller; both use a serial interface compatible with common microcontrollers. |
| Package / Mounting | 24-lead SOIC (surface mount) | 24-lead SOIC (surface mount) | Package and footprint must match the PCB layout; both are 24-lead SOIC devices, allowing drop-in replacement. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range must cover the application environment; both are specified over the industrial range. |
| Grade / Accuracy Class | A grade (standard linearity/accuracy) | B grade (improved linearity/accuracy) | Grade affects INL, offset, and gain error specifications; the B grade offers tighter accuracy than the A grade, which matters for precision measurement applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7890ARZ-10 | AD7890BR-2 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Type | Data Acquisition System (DAS) | Data Acquisition System (DAS) |
| Number of Channels | 8 | 8 |
| Resolution(Bits) | 12 b | 12 b |
| Sampling Rate(Per Second) | 117k | 117k |
| Data Interface | SPI | Serial |
| Voltage Supply Source | Single Supply | Single Supply |
| Voltage - Supply | 5V | 0V ~ 2.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AD7890ARZ-10 and AD7890BR-2?
The AD7890ARZ-10 is a 12-bit, 8-channel data acquisition system with a 10 µs conversion time and a ±10 V input range, specified for the commercial temperature range of 0°C to +70°C. The AD7890BR-2 is a 12-bit, 8-channel data acquisition system with a 5 µs conversion time and a ±2.5 V input range, specified for the industrial temperature range of -40°C to +85°C. Both are housed in a 24-lead SOIC package and feature an on-chip track-and-hold amplifier and a serial interface.
Can the AD7890ARZ-10 and AD7890BR-2 be used interchangeably in an existing design?
No, they are not directly interchangeable. The AD7890ARZ-10 has a ±10 V input range and a 10 µs conversion time, while the AD7890BR-2 has a ±2.5 V input range and a 5 µs conversion time. The different analog input ranges require different signal conditioning, and the different conversion times affect the maximum achievable throughput. The temperature grade also differs, so the AD7890BR-2 is required for industrial temperature operation.
What is the analog input range of each device?
The AD7890ARZ-10 provides a bipolar analog input range of ±10 V. The AD7890BR-2 provides a bipolar analog input range of ±2.5 V. The input range is determined by the specific model suffix and cannot be changed by external configuration.
How do the conversion times of the AD7890ARZ-10 and AD7890BR-2 compare?
The AD7890ARZ-10 has a conversion time of 10 µs, while the AD7890BR-2 has a conversion time of 5 µs. The faster conversion time of the AD7890BR-2 allows a higher maximum sampling rate for a given serial clock rate and readback scheme.
What are the operating temperature ranges for the AD7890ARZ-10 and AD7890BR-2?
The AD7890ARZ-10 is specified for the commercial temperature range of 0°C to +70°C. The AD7890BR-2 is specified for the industrial temperature range of -40°C to +85°C. Designs requiring operation below 0°C or above +70°C must use the AD7890BR-2 or another appropriately graded version.
Do the AD7890ARZ-10 and AD7890BR-2 use the same package and pinout?
Yes, both devices are offered in a 24-lead SOIC package with the same pinout. This allows a common PCB footprint, but the differences in input range, conversion time, and temperature grade must still be evaluated before substituting one for the other.
What is the resolution and channel count of the AD7890ARZ-10 and AD7890BR-2?
Both devices are 12-bit successive-approximation ADCs with an 8-channel input multiplexer, an on-chip track-and-hold amplifier, and a serial digital interface. The resolution and channel count are identical; the primary differences are the analog input range, conversion time, and specified temperature range.