Part A
AD7894ARZ-3
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 3263 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)
Replacement verdict
Not a drop-in replacement
The AD7894ARZ-3 and AD7892AR-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 resolution architecture, input configuration, throughput rate, and reference/supply arrangement, so a direct board-level substitution is not possible without design changes.
Different input configuration
Different throughput rate
Different reference architecture
Different supply arrangement
Parts at a glance
Part B
AD7892AR-2
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 9769 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)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7894ARZ-3 | AD7892AR-2 | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 12 bit | Higher resolution provides finer quantization and better dynamic range, affecting measurement accuracy and substitutability in precision applications. |
| Number of ADC Inputs | 1 (single-ended) | 2 (single-ended) | The channel count determines how many signals can be digitized; a two-channel part can replace a single-channel one only if the extra channel is unused or multiplexing is acceptable. |
| Sampling Rate | 200 kSPS | 500 kSPS | Maximum throughput limits the bandwidth of signals that can be captured; a slower part may not meet timing requirements of the original design. |
| Input Voltage Range | ±10 V | ±10 V (bipolar) | The full-scale input span must match the signal source to avoid clipping or loss of resolution; both parts accept ±10 V here. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Supply compatibility ensures the replacement can operate from the existing power rail without additional regulation. |
| Interface Type | Serial (SPI/QSPI compatible) | Parallel | The digital interface must match the host controller; serial versus parallel output requires different board routing and firmware. |
| Package / Mounting | 20-lead SOIC (surface mount) | 24-lead SOIC (surface mount) | Package footprint and pin count affect PCB layout compatibility; different lead counts prevent direct drop-in replacement. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range must cover the application environment to guarantee specified performance and reliability. |
| Power Consumption | Typically 60 mW | Typically 60 mW | Power dissipation affects thermal design and supply sizing; similar consumption eases substitution in power-constrained systems. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7894ARZ-3 | AD7892AR-2 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 14 | 12 |
| Sampling Rate(Per Second) | 200k | 500k |
| Number of Inputs | 1 | 2 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI | SPI, Parallel |
| 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 | External, Internal |
| 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 AD7894ARZ-3 and AD7892AR-2?
The AD7894ARZ-3 is a 14-bit successive-approximation ADC with a 5 V single supply and a 0 V to +2.5 V input range, housed in a 24-lead SOIC. The AD7892AR-2 is a 12-bit ADC with a 5 V single supply and a ±2.5 V bipolar input range, also in a 24-lead SOIC. They differ in resolution, input range, and internal architecture.
Can the AD7894ARZ-3 and AD7892AR-2 be used interchangeably in an existing design?
No. The AD7894ARZ-3 provides 14-bit resolution with a unipolar 0 V to +2.5 V input range, while the AD7892AR-2 provides 12-bit resolution with a bipolar ±2.5 V input range. The differing resolution, input span, and transfer function require circuit and firmware changes, so they are not drop-in replacements.
Do the AD7894ARZ-3 and AD7892AR-2 share the same package and pinout?
Both devices are offered in a 24-lead SOIC package, but their pin functions and internal signal assignments differ because of their different architectures and input configurations. Designers must consult the respective manufacturer datasheets before considering any PCB layout reuse.
What are the supply voltage requirements for the AD7894ARZ-3 and AD7892AR-2?
Both the AD7894ARZ-3 and AD7892AR-2 operate from a single 5 V supply. The AD7894ARZ-3 is specified for a 5 V single-supply operation with a 0 V to +2.5 V input range, and the AD7892AR-2 is specified for 5 V single-supply operation with a ±2.5 V input range.
How do the input voltage ranges of the AD7894ARZ-3 and AD7892AR-2 compare?
The AD7894ARZ-3 accepts a unipolar input range of 0 V to +2.5 V. The AD7892AR-2 accepts a bipolar input range of ±2.5 V. This difference affects signal conditioning, reference requirements, and the digital output coding for each converter.
What are the resolution and output coding differences between the AD7894ARZ-3 and AD7892AR-2?
The AD7894ARZ-3 is a 14-bit ADC, providing finer quantization than the 12-bit AD7892AR-2. The AD7894ARZ-3 produces a unipolar straight-binary output for its 0 V to +2.5 V input range, while the AD7892AR-2 produces a bipolar output code for its ±2.5 V input range. These differences must be accounted for in system calibration and data processing.
Which device is better suited for unipolar signal acquisition?
The AD7894ARZ-3 is better suited for unipolar signal acquisition because its specified input range is 0 V to +2.5 V with 14-bit resolution. The AD7892AR-2 is intended for bipolar ±2.5 V signals and provides 12-bit resolution, so it is less appropriate for strictly unipolar 0 V to +2.5 V measurements.
Are the AD7894ARZ-3 and AD7892AR-2 RoHS compliant?
The AD7894ARZ-3 suffix "Z" denotes a RoHS-compliant package per Analog Devices nomenclature. The AD7892AR-2 does not carry the "Z" suffix, so its RoHS status must be confirmed from the specific manufacturer datasheet or ordering guide before use in RoHS-restricted assemblies.