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
Compatible functional replacement candidate
The AD7894ARZ-3 and AD7893AR-3 are both 14-bit successive-approximation ADCs from Analog Devices in a 8-lead SOIC package, sharing a similar serial interface and reference architecture, making the AD7894ARZ-3 a viable functional replacement candidate for the AD7893AR-3 in many designs. However, designers must validate supply voltage, input range, and throughput requirements against the target application before committing to the substitution.
Resolution and Architecture
Validation required
Supply Voltage
Validation required
Input Range
Validation required
Package Type
High match
Parts at a glance
Part B
AD7893AR-3
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4826 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 | AD7894ARZ-3 | AD7893AR-3 | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 12 bit | Resolution determines the smallest measurable signal step; a 14-bit ADC provides four times finer quantization than a 12-bit ADC, affecting measurement accuracy. |
| Number of Input Channels | 1 (single-ended) | 1 (single-ended) | Both are single-channel devices, so channel count is not a differentiator, but confirms neither supports multiplexed multi-signal acquisition. |
| Sampling Rate | 200 kSPS | 117 kSPS | Maximum throughput affects how fast signals can be digitized; the AD7894 supports higher sampling rates for faster-changing inputs. |
| Input Voltage Range | ±2.5 V (bipolar) | ±2.5 V (bipolar) | The analog input span must match the sensor or signal source; both share the same bipolar range, easing direct substitution in signal chain design. |
| Supply Voltage | 5 V single supply | 5 V single supply | Supply compatibility ensures the part can drop into the same power rail without level shifting or additional regulation. |
| Interface Type | Serial (SPI/QSPI compatible) | Serial (SPI/QSPI compatible) | A matching serial interface allows the same microcontroller or DSP port to be reused without firmware or hardware redesign. |
| Package / Mounting | 20-lead SOIC (surface mount) | 8-lead SOIC (surface mount) | Different package footprints require PCB layout changes; the AD7893's smaller 8-lead package saves board area but is not pin-compatible. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same industrial environments without derating concerns. |
| Power Consumption | Typically 20 mW | Typically 25 mW | Lower power dissipation benefits thermally constrained or battery-powered designs and influences supply sizing. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7894ARZ-3 | AD7893AR-3 |
|---|---|---|
| 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-3?
The AD7894ARZ-3 is a 14-bit successive-approximation ADC with a 5 µs conversion time and a 0 V to +2.5 V input range, housed in a 14-lead SOIC package. The AD7893AR-3 is a 12-bit successive-approximation ADC with a 6 µs conversion time and a 0 V to +2.5 V input range, also in a 14-lead SOIC package. The primary differences are resolution (14-bit vs 12-bit) and conversion time (5 µs vs 6 µs).
Are the AD7894ARZ-3 and AD7893AR-3 pin-compatible?
Both devices are offered in a 14-lead SOIC package and share the same pinout for the serial interface, reference, and analog input functions, allowing them to be used in the same PCB footprint. However, designers should verify the pin function assignments against the respective manufacturer datasheets before substitution.
What is the resolution and conversion time of each device?
The AD7894ARZ-3 provides 14-bit resolution with a 5 µs conversion time. The AD7893AR-3 provides 12-bit resolution with a 6 µs conversion time. Both are successive-approximation register (SAR) ADCs.
What analog input range do these ADCs support?
Both the AD7894ARZ-3 and AD7893AR-3 are specified with a 0 V to +2.5 V unipolar analog input range. The input range is fixed and determined by the internal reference and input scaling circuitry.
What is the supply voltage and power consumption of these devices?
Both the AD7894ARZ-3 and AD7893AR-3 operate from a single +5 V supply. The AD7894ARZ-3 typically dissipates 20 mW, while the AD7893AR-3 typically dissipates 25 mW, according to the manufacturer datasheets.
What serial interface do the AD7894ARZ-3 and AD7893AR-3 use?
Both devices provide a high-speed serial interface compatible with SPI, QSPI, MICROWIRE, and DSP interface standards. The interface includes a serial clock, data output, and frame synchronization signals for direct connection to microcontrollers and digital signal processors.
Can the AD7893AR-3 be used as a drop-in replacement for the AD7894ARZ-3?
Because the AD7893AR-3 offers 12-bit resolution versus the 14-bit resolution of the AD7894ARZ-3, it is not a direct functional replacement where 14-bit accuracy is required. The devices are pin-compatible in the 14-lead SOIC package, but system resolution and conversion timing requirements must be evaluated before substitution.
What are the operating temperature ranges for these ADCs?
Both the AD7894ARZ-3 and AD7893AR-3 are specified for the industrial temperature range of −40 °C to +85 °C, as stated in the manufacturer datasheets.