Part A
AD7892ARZ-1
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6834 個数
- Package
- SOIC-24
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Not a drop-in replacement
The AD7892ARZ-1 and AD7893AR-2 are not drop-in replacements for one another. Although both are Analog Devices 12-bit successive-approximation ADCs in a 24-lead SOIC package, they differ in input channel configuration, conversion throughput, external reference requirements, and serial interface timing, so a direct board-level substitution is not possible without design changes.
Different input channel count
Different throughput rate
Different reference architecture
Different serial interface timing
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 | AD7892ARZ-1 | AD7893AR-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 | 2 (single-ended, with 2-channel multiplexer) | 1 (single-ended) | The AD7892 offers a 2-channel input multiplexer while the AD7893 is single-channel, affecting how many signals can be digitized without external muxing. |
| Sampling Rate | 500 kSPS | 117 kSPS | Maximum throughput differs significantly; the AD7892 supports much faster sampling, which matters for high-speed signal acquisition. |
| Input Voltage Range | ±10 V (bipolar) | ±10 V (bipolar) | Both accept the same ±10 V bipolar input span, so analog front-end scaling requirements are similar. |
| Interface Type | Parallel (12-bit word) | Serial (SPI/QSPI compatible) | The output interface differs (parallel vs serial), which directly affects microcontroller/FPGA pin count and firmware design. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Both operate from a single 5 V supply, simplifying power rail compatibility in a shared design. |
| Package / Mounting | 24-lead SOIC (surface mount) | 8-lead SOIC (surface mount) | Different package sizes and pin counts mean the PCB footprint and layout are not drop-in compatible. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature ranges mean both suit the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7892ARZ-1 | AD7893AR-2 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 500k | 117k |
| Number of Inputs | 2 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI, Parallel | SPI |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External, Internal | External |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD7892ARZ-1 and AD7893AR-2?
The AD7892ARZ-1 is a 12-bit successive-approximation ADC with a 500 kSPS throughput rate, an on-chip track/hold amplifier, and a parallel interface. The AD7893AR-2 is a 12-bit successive-approximation ADC with a 117 kSPS throughput rate and a serial interface. The AD7892ARZ-1 offers higher speed and parallel output, while the AD7893AR-2 provides a slower serial interface in a smaller package.
Are the AD7892ARZ-1 and AD7893AR-2 pin-compatible?
No. The AD7892ARZ-1 is supplied in a 24-lead SOIC package with a parallel data bus and dedicated control pins, while the AD7893AR-2 is supplied in an 8-lead SOIC package with a serial interface. The package sizes, pin counts, and pin functions differ, so they are not pin-compatible and cannot be interchanged on the same PCB footprint.
What are the throughput rates of the AD7892ARZ-1 and AD7893AR-2?
The AD7892ARZ-1 has a specified throughput rate of 500 kSPS. The AD7893AR-2 has a specified throughput rate of 117 kSPS. The AD7892ARZ-1 is therefore approximately four times faster and is better suited to higher-speed acquisition applications.
What interface types do the AD7892ARZ-1 and AD7893AR-2 use?
The AD7892ARZ-1 provides a parallel microprocessor-compatible interface for direct connection to a data bus. The AD7893AR-2 provides a serial interface for connection to serial ports or microcontrollers with fewer I/O pins. The choice depends on the host system's bus architecture and pin budget.
What are the analog input voltage ranges of the AD7892ARZ-1 and AD7893AR-2?
The AD7892ARZ-1 offers selectable input ranges of ±10 V and ±5 V, configured via the RANGE pin. The AD7893AR-2 offers a 0 V to +2.5 V unipolar input range. Designs requiring bipolar input signals should use the AD7892ARZ-1, while unipolar low-voltage signals suit the AD7893AR-2.
Do the AD7892ARZ-1 and AD7893AR-2 have internal reference voltage sources?
Yes. Both the AD7892ARZ-1 and AD7893AR-2 include an on-chip reference voltage source, allowing ratiometric or absolute operation without an external reference in many designs. An external reference can be applied if higher accuracy or a different reference value is required.
What are the power supply requirements for the AD7892ARZ-1 and AD7893AR-2?
Both devices operate from a single +5 V supply. The AD7892ARZ-1 typically consumes about 60 mW at 500 kSPS, while the AD7893AR-2 typically consumes about 25 mW at 117 kSPS. The lower power of the AD7893AR-2 makes it preferable for power-sensitive designs.
Can the AD7893AR-2 be used as a drop-in replacement for the AD7892ARZ-1?
No. The two devices differ in package, pin count, interface type (serial versus parallel), throughput rate, and input range configuration. A direct drop-in replacement is not possible; a redesign of the PCB footprint, interface logic, and input signal conditioning would be required.