Part A
AD7894ARZ-3
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3263 Stückzahl
- Package
- SOIC-8
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7894ARZ-3 and AD7893AR-5 are both 12-bit successive-approximation ADCs from Analog Devices in a compatible SOIC-8 package, sharing a similar serial interface architecture. However, they differ in analog input range, reference configuration, and throughput rate, so the AD7893AR-5 is only a functional candidate rather than a direct drop-in replacement. Designers must validate input scaling, reference requirements, and timing against the target application before substituting.
Analog Input Range
Validation required
Reference Configuration
Validation required
Throughput Rate
Validation required
Package Type
High match
Parts at a glance
Part B
AD7893AR-5
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 369 Stückzahl
- Package
- SOIC-8
- Series
- Datenerfassung mit Analog to Digital Converters (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 | AD7893AR-5 | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 12 bit | Higher resolution provides finer quantization of the analog input, directly affecting measurement accuracy and dynamic range. |
| Number of Input Channels | 1 (single-ended) | 1 (single-ended) | Both are single-channel devices, so channel count is not a differentiator for substitutability. |
| Sampling Rate | 200 kSPS | 117 kSPS | Maximum throughput determines how fast the system can acquire signals; a slower part may not meet timing requirements. |
| Input Voltage Range | ±2.5 V | ±2.5 V | Matching input ranges ensures the same signal conditioning front-end can be reused without redesign. |
| Supply Voltage | 5 V | 5 V | Identical supply requirements allow drop-in replacement on the same power rail. |
| Interface Type | Serial (SPI/QSPI compatible) | Serial (SPI/QSPI compatible) | Same serial interface means the digital host connection and firmware protocol can remain unchanged. |
| Package / Mounting | 20-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount) | Different package footprints require PCB layout changes, affecting direct board-level substitutability. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings ensure equivalent environmental robustness for the target application. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7894ARZ-3 | AD7893AR-5 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 14 | 12 |
| Sampling Rate(Per Second) | 200k | 117k |
| Number of A/D Converters | 1 | 1 |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Number of Inputs | 1 | - |
| Input Type | Single Ended | - |
| Data Interface | SPI | - |
| Configuration | S/H-ADC | - |
| Ratio - S / H: ADC | 1:1 | - |
| Architecture | SAR | - |
| Reference Type | External | - |
| Voltage - Supply, Analog | 5V | - |
| Voltage - Supply, Digital | 5V | - |
Frequently asked questions
What are the key differences between the AD7894ARZ-3 and AD7893AR-5?
The AD7894ARZ-3 is a 14-bit successive-approximation ADC with a 0 V to +2.5 V input range and an external reference requirement, housed in a 14-lead SOIC package. The AD7893AR-5 is a 12-bit successive-approximation ADC with a 0 V to +5 V input range and an internal reference, also in a 14-lead SOIC package. They differ in resolution, input span, and reference architecture.
Are the AD7894ARZ-3 and AD7893AR-5 pin-compatible?
Both devices are offered in a 14-lead SOIC package, but pin functions and external connections differ because of their different reference and input-range architectures. A direct drop-in substitution should not be assumed; the PCB layout and pin assignments must be verified against the respective manufacturer datasheets.
What is the resolution of each converter?
The AD7894ARZ-3 provides 14-bit resolution, while the AD7893AR-5 provides 12-bit resolution. The higher resolution of the AD7894ARZ-3 yields finer quantization steps for the same input span.
What input voltage ranges do these ADCs support?
The AD7894ARZ-3 accepts a 0 V to +2.5 V analog input range. The AD7893AR-5 accepts a 0 V to +5 V analog input range. The input span must be matched to the signal conditioning and reference of the target design.
Do these devices require an external voltage reference?
The AD7894ARZ-3 requires an external reference voltage to set its full-scale input range. The AD7893AR-5 includes an internal reference, reducing external component count. Designs migrating between the two must account for this reference architecture difference.
What is the supply voltage requirement for each part?
Both the AD7894ARZ-3 and AD7893AR-5 operate from a single +5 V supply. The supply decoupling and analog input conditioning should be reviewed against the manufacturer datasheet when substituting one for the other.
Can the AD7893AR-5 be used as a direct replacement for the AD7894ARZ-3?
No direct replacement should be assumed. The AD7893AR-5 has lower resolution (12-bit vs 14-bit), a different input range (0 V to +5 V vs 0 V to +2.5 V), and an internal rather than external reference. System accuracy, input scaling, and firmware timing must be revalidated before any substitution.
What interface do these ADCs use to connect to a microcontroller or DSP?
Both the AD7894ARZ-3 and AD7893AR-5 provide a serial digital interface for connection to microcontrollers and DSPs. The exact timing, word length, and data format differ because of the different resolutions, so the interface timing must be checked against the respective datasheets.