Part A
AD7890ARZ-10
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6285 PCS
- Package
- SOIC-24
- Series
- Acquisition de données - ADC DAC - dédié
Replacement verdict
Not a drop-in replacement
The AD7890ARZ-10 and AD7892AR-2 are not drop-in replacements for one another. Although both are Analog Devices 12-bit ADCs, they differ fundamentally in architecture, channel count, package footprint, and interface configuration, so substituting one for the other requires board redesign and firmware changes rather than a direct swap.
Different channel count
Different package footprint
Different interface type
Different conversion architecture
Parts at a glance
Part B
AD7892AR-2
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 9769 PCS
- Package
- SOIC-24
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | AD7892AR-2 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so nominal resolution is equivalent for substitutability. |
| Number of Input Channels | 8 (single-ended, multiplexed) | 2 (single-ended) | Channel count determines how many signals can be digitized; the AD7890 supports more inputs via an internal multiplexer. |
| Sampling Rate | 117 kSPS | 500 kSPS | Maximum throughput affects the ability to capture fast-changing signals; the AD7892 is significantly faster. |
| Input Type | Single-ended | Single-ended | Input configuration must match the signal source topology for direct substitution. |
| Interface | Serial (SPI/QSPI compatible) | Parallel | The digital interface must match the host controller; serial versus parallel is a major architectural difference. |
| Supply Voltage | 5 V | 5 V | Supply voltage compatibility is required for direct board-level replacement. |
| Package | 24-lead SOIC | 24-lead SOIC | Package footprint must match for physical drop-in compatibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range must cover the application environment for reliable operation. |
| Reference Type | External | Internal | Reference architecture affects accuracy, external component count, and system design; internal versus external is a key difference. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7890ARZ-10 | AD7892AR-2 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | - | 12 |
| Sampling Rate(Per Second) | 117k | 500k |
| Number of Inputs | - | 2 |
| Input Type | - | Single Ended |
| Data Interface | SPI | SPI, Parallel |
| Configuration | - | S/H-ADC |
| Ratio - S / H: ADC | - | 1:1 |
| Number of A/D Converters | - | 1 |
| Architecture | - | SAR |
| Reference Type | - | External, Internal |
| Voltage - Supply, Analog | - | 5V |
| Voltage - Supply, Digital | - | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Type | Data Acquisition System (DAS) | - |
| Number of Channels | 8 | - |
| Resolution(Bits) | 12 b | - |
| 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 AD7892AR-2?
The AD7890ARZ-10 is an 8-channel, 12-bit data acquisition system (DAS) with a serial interface and a 10 µs conversion time, housed in a 24-lead SOIC package. The AD7892AR-2 is a single-channel, 12-bit successive-approximation ADC with a parallel interface and a 1.47 µs conversion time, housed in a 24-lead SOIC package. The AD7890ARZ-10 integrates an input multiplexer and sequencer for multi-channel sampling, while the AD7892AR-2 is optimized for high-speed single-channel conversion.
Are the AD7890ARZ-10 and AD7892AR-2 pin-compatible?
No. Although both devices are offered in a 24-lead SOIC package, their pin functions differ. The AD7890ARZ-10 uses a serial data interface and includes multiplexer control pins, while the AD7892AR-2 uses a parallel data interface. Pin assignments and functions are not interchangeable, so the devices cannot be directly substituted without PCB redesign.
What are the input voltage ranges for the AD7890ARZ-10 and AD7892AR-2?
The AD7890ARZ-10 is specified with a ±10 V input range (the "-10" suffix denotes the ±10 V input option). The AD7892AR-2 is specified with a 0 V to +2.5 V input range (the "-2" suffix denotes the 2.5 V input option). These ranges are not equivalent, so signal conditioning must be adjusted if migrating between the two devices.
How do the conversion times and throughput rates compare?
The AD7890ARZ-10 has a conversion time of 10 µs, supporting a throughput rate of up to 100 kSPS. The AD7892AR-2 has a conversion time of 1.47 µs, supporting a throughput rate of up to 500 kSPS. The AD7892AR-2 is therefore significantly faster on a per-conversion basis, while the AD7890ARZ-10 provides multi-channel sequencing capability.
What interface types do these two ADCs use?
The AD7890ARZ-10 provides a serial interface for data output and configuration. The AD7892AR-2 provides a parallel interface for data output. System designers must ensure the host controller supports the corresponding interface type; the two interfaces are not directly interchangeable.
How many input channels does each device support?
The AD7890ARZ-10 provides 8 input channels through an integrated multiplexer with a sequencer. The AD7892AR-2 provides a single input channel. The AD7890ARZ-10 is suited for multi-channel data acquisition, while the AD7892AR-2 is suited for single-channel high-speed sampling.
Do the AD7890ARZ-10 and AD7892AR-2 share the same package and operating temperature range?
Both devices are available in a 24-lead SOIC package and are specified for the industrial temperature range of −40 °C to +85 °C. However, package compatibility alone does not permit substitution because pin functions and interfaces differ.
Can the AD7892AR-2 replace the AD7890ARZ-10 in an existing multi-channel design?
No. The AD7892AR-2 is a single-channel device with a parallel interface and a 0 V to +2.5 V input range, whereas the AD7890ARZ-10 is an 8-channel device with a serial interface and a ±10 V input range. Replacing one with the other would require redesign of the input multiplexing, interface, and signal conditioning, and is not a drop-in substitution.