Part A
AD7890ARZ-10
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6285 個数
- Package
- SOIC-24
- Series
- データ取得 - ADC/DAC - 特殊用途向け
Replacement verdict
Not a drop-in replacement
The AD7890ARZ-10 and AD7893AR-2 are not drop-in replacements for one another. The AD7890ARZ-10 is an 8-channel, 12-bit data acquisition system with an on-chip multiplexer and a serial interface, whereas the AD7893AR-2 is a single-channel, 12-bit ADC in a smaller package with a different serial interface and reference configuration. Their channel count, package footprint, and interface architecture differ fundamentally, so a direct board-level substitution is not possible without redesign.
Different channel count
Different package footprint
Different interface architecture
Different reference configuration
Parts at a glance
Part B
AD7893AR-2
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4273 個数
- Package
- SOIC-8
- Series
- データ取得 - アナログ/デジタルコンバータ (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 | AD7893AR-2 | Why it matters |
|---|---|---|---|
| Number of ADC Channels | 8 (single-ended, via multiplexer) | 1 (single-ended) | Determines how many analog signals can be digitized; the AD7890 can multiplex 8 inputs while the AD7893 handles only one, so they are not drop-in substitutes in multi-channel systems. |
| Resolution | 12 bits | 12 bits | Both provide 12-bit resolution, so quantization accuracy is comparable and neither offers a resolution advantage. |
| Sampling Rate | 105 kSPS | 117 kSPS | Maximum throughput affects how fast signals can be captured; the AD7893 is slightly faster, which matters for higher-bandwidth or time-critical acquisition. |
| Input Voltage Range | ±10 V (bipolar) | 0 V to +2.5 V (unipolar) | The input span must match the sensor or signal source; the bipolar ±10 V range of the AD7890 versus the unipolar 0–2.5 V range of the AD7893 makes them suited to very different signal conditions. |
| Interface Type | Serial (SPI/QSPI compatible) | Serial (SPI/QSPI compatible) | Both use a serial interface, so the digital host connection is similar, but the AD7890 includes multiplexer control that changes the command protocol. |
| Supply Voltage | +5 V | +5 V | Both operate from a single +5 V supply, so power-rail requirements are compatible. |
| Package | 24-lead SOIC (SOIC_W) | 8-lead SOIC (SOIC_N) | Footprint and pin count differ significantly, so a board redesign is required to swap between these parts. |
| Internal Reference | Yes (2.5 V) | Yes (2.5 V) | An on-chip reference simplifies design and improves accuracy consistency; both include one, so external reference circuitry is not mandatory for either. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Both are rated for industrial temperature ranges, so environmental tolerance is equivalent. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7890ARZ-10 | AD7893AR-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 differences between the AD7890ARZ-10 and the AD7893AR-2?
The AD7890ARZ-10 is an 8-channel, 12-bit successive-approximation ADC with a 10 µs conversion time, housed in a 24-lead SOIC package. The AD7893AR-2 is a single-channel, 12-bit SAR ADC with a 6 µs conversion time, housed in an 8-lead SOIC package. The AD7890ARZ-10 integrates an input multiplexer and sample-and-hold for multi-channel systems, while the AD7893AR-2 is optimized for single-channel, higher-throughput applications.
Are the AD7890ARZ-10 and AD7893AR-2 pin-compatible or package-compatible?
No. The AD7890ARZ-10 uses a 24-lead SOIC (RW-24) package, while the AD7893AR-2 uses an 8-lead SOIC (R-8) package. The pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for each other.
Can the AD7893AR-2 be used as a direct substitute for the AD7890ARZ-10 in an existing design?
No. The AD7893AR-2 is a single-channel device, whereas the AD7890ARZ-10 provides 8 input channels through an on-chip multiplexer. Substitution would require redesign of the analog input front end, the digital interface, and the PCB layout to accommodate the different package and channel count.
How do the conversion times and throughput of the two devices compare?
The AD7890ARZ-10 specifies a conversion time of 10 µs, while the AD7893AR-2 specifies a conversion time of 6 µs. The shorter conversion time of the AD7893AR-2 supports higher per-channel sampling rates, but the AD7890ARZ-10 provides eight channels, so overall system throughput depends on channel count and multiplexer settling requirements.
What are the analog input voltage ranges for the AD7890ARZ-10 and AD7893AR-2?
The AD7890ARZ-10 (ARZ-10 grade) provides a bipolar input range of ±10 V. The AD7893AR-2 (AR-2 grade) provides a bipolar input range of ±2.5 V. Designs must account for these different full-scale ranges when selecting input conditioning circuitry.
Do both devices support the same digital interface?
Both devices provide a serial digital output, but the interface details differ. The AD7890ARZ-10 includes a multiplexer channel address interface in addition to the serial data output, while the AD7893AR-2 provides a simpler single-channel serial interface. Firmware and timing must be validated against each device's datasheet before reuse.
What are the power supply requirements for the AD7890ARZ-10 and AD7893AR-2?
Both devices operate from a single +5 V supply. The AD7890ARZ-10 additionally requires a negative supply for its bipolar ±10 V input range, whereas the AD7893AR-2 operates with the ±2.5 V input range using its specified supply configuration. Refer to the respective datasheets for exact supply and reference requirements.
Which device is better suited for multi-channel data acquisition systems?
The AD7890ARZ-10 is better suited for multi-channel systems because it integrates an 8-channel input multiplexer with sample-and-hold, reducing external component count. The AD7893AR-2 is intended for single-channel applications where a compact 8-lead package and faster 6 µs conversion are advantageous.