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 AD7893BR-2 are not drop-in replacements for one another. The AD7890ARZ-10 is an 8-channel multiplexed 12-bit ADC with an on-chip track/hold amplifier and a serial interface, while the AD7893BR-2 is a single-channel 12-bit ADC with a faster conversion time and a different package and pinout. Designers must account for differences in channel count, package footprint, and interface timing before considering substitution.
Different channel count
Different package footprint
Different interface timing
Different input configuration
Parts at a glance
Part B
AD7893BR-2
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 5300 PCS
- Package
- SOIC-8
- 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 | AD7893BR-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 (multiplexed, single-ended) | 1 channel (single-ended) | The AD7890 provides an 8-channel multiplexer, while the AD7893 is single-channel; this fundamentally changes system architecture and channel count. |
| Sampling Rate | 105 kSPS | 117 kSPS | Maximum throughput differs slightly; the AD7893 offers a marginally higher conversion rate. |
| Input Voltage Range | ±10 V (bipolar) | 0 V to +2.5 V (unipolar) | Input span and polarity differ significantly, affecting signal conditioning and whether the part suits bipolar or unipolar sensors. |
| Interface Type | Serial (SPI/QSPI compatible) | Serial (SPI/QSPI compatible) | Both use a serial interface, easing digital-side substitution, though protocol timing details should be checked. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Identical nominal supply simplifies power-rail compatibility between the two parts. |
| Package / Mounting | 24-lead SOIC (surface mount) | 8-lead SOIC (surface mount) | Different package sizes and pin counts mean the PCB footprint is not drop-in compatible. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Equivalent industrial temperature range supports use in similar environments. |
| Internal Reference | Yes (on-chip reference) | Yes (on-chip reference) | Both integrate a 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 | AD7893BR-2 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | - | 12 |
| Sampling Rate(Per Second) | 117k | 117k |
| Number of Inputs | - | 1 |
| Input Type | - | Single Ended |
| Data Interface | SPI | SPI |
| Configuration | - | S/H-ADC |
| Ratio - S / H: ADC | - | 1:1 |
| Number of A/D Converters | - | 1 |
| Architecture | - | SAR |
| Reference Type | - | External |
| 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 AD7893BR-2?
The AD7890ARZ-10 is an 8-channel, 12-bit successive-approximation ADC with a serial interface and a 10 µs conversion time, housed in a 24-lead SOIC package. The AD7893BR-2 is a single-channel, 12-bit successive-approximation ADC with a serial interface and a 6 µs conversion time, housed in an 8-lead SOIC package. The AD7890ARZ-10 provides multiplexed multi-channel acquisition, while the AD7893BR-2 is a single-channel device optimized for faster throughput.
Are the AD7890ARZ-10 and AD7893BR-2 pin-compatible or package-compatible?
No. The AD7890ARZ-10 is supplied in a 24-lead SOIC package, whereas the AD7893BR-2 is supplied in an 8-lead SOIC package. The pin counts, pin functions, and PCB land patterns differ, so they are not direct drop-in replacements for each other.
How do the input channel configurations of the AD7890ARZ-10 and AD7893BR-2 differ?
The AD7890ARZ-10 provides an 8-channel input multiplexer, allowing selection among eight analog input channels. The AD7893BR-2 has a single analog input channel. Designs requiring multiple channels must use the AD7890ARZ-10 or an external multiplexer with the AD7893BR-2.
How do the conversion times and throughput of the AD7890ARZ-10 and AD7893BR-2 compare?
The AD7890ARZ-10 has a specified conversion time of 10 µs, while the AD7893BR-2 has a specified conversion time of 6 µs. The shorter conversion time of the AD7893BR-2 supports higher per-channel sampling rates, whereas the AD7890ARZ-10 trades conversion speed for integrated 8-channel multiplexing.
Do the AD7890ARZ-10 and AD7893BR-2 use the same serial interface?
Both devices provide a serial digital interface for connection to microcontrollers and DSPs, but the exact interface timing, register structure, and control word format differ between the two products. Firmware and interface logic must be designed according to the respective datasheet for each part and are not interchangeable without modification.
What are the resolution and accuracy specifications of the AD7890ARZ-10 and AD7893BR-2?
Both the AD7890ARZ-10 and the AD7893BR-2 are 12-bit successive-approximation ADCs. The AD7890ARZ-10 is specified with a 10 V input range variant (suffix -10), and the AD7893BR-2 is specified with a 2.5 V input range variant (suffix -2). Accuracy, linearity, and drift specifications should be taken from the respective manufacturer datasheets for each grade.
Can the AD7893BR-2 replace the AD7890ARZ-10 in an existing 8-channel design?
No, not directly. The AD7893BR-2 is a single-channel device in an 8-lead package, while the AD7890ARZ-10 is an 8-channel device in a 24-lead package. Replacing the AD7890ARZ-10 with the AD7893BR-2 would require an external multiplexer, redesigned PCB layout, and revised firmware, and the input range difference (10 V versus 2.5 V) must also be accommodated.
Which device is better suited for multi-channel data acquisition systems?
The AD7890ARZ-10 is better suited for multi-channel data acquisition because it integrates an 8-channel input multiplexer with a 12-bit ADC in a single package. The AD7893BR-2 is intended for single-channel applications where its faster 6 µs conversion time and smaller 8-lead package are advantageous.