Part A
AD7892BRZ-1
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6270 PCS
- Package
- SOP-24
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Not a drop-in replacement
The AD7892BRZ-1 and AD7894AR-2 are not drop-in replacements for each other. Although both are Analog Devices 12-bit successive-approximation ADCs, they differ in resolution-adjacent architecture, input configuration, package footprint, and external component requirements, so a direct board-level substitution is not feasible without redesign.
Different input configuration
Different package footprint
Different conversion architecture
Different external component needs
Parts at a glance
Part B
AD7894AR-2
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 73 PCS
- Package
- SOIC-8
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | AD7892BRZ-1 | AD7894AR-2 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 14 bit | Resolution determines the smallest analog change the ADC can distinguish; a 14-bit part offers finer quantization than a 12-bit part, affecting measurement precision. |
| Number of Input Channels | 2 (single-ended) | 1 (single-ended) | Channel count affects how many signals can be digitized without external multiplexing; the two-channel AD7892BRZ-1 can handle an additional input directly. |
| Sampling Rate | 500 kSPS | 200 kSPS | Maximum throughput limits the bandwidth of signals that can be captured; the faster AD7892BRZ-1 supports higher-frequency inputs. |
| Input Voltage Range | ±10 V (bipolar) | ±10 V (bipolar) | The full-scale input span must match the signal source; both parts accept ±10 V, so the analog front-end scaling is compatible. |
| Interface Type | Parallel | Serial (SPI/QSPI compatible) | The digital interface must match the host controller; a parallel interface requires more pins while a serial interface reduces pin count and routing. |
| Supply Voltage | 5 V | 5 V | Supply voltage compatibility ensures the part can operate from the same rail as the rest of the system without additional regulation. |
| Package | 24-Lead SOIC | 8-Lead SOIC | Package footprint and pin count affect PCB layout and board space; the smaller 8-lead package of the AD7894AR-2 requires a different land pattern. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range must cover the application environment; both parts are rated for industrial temperature operation. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7892BRZ-1 | AD7894AR-2 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 14 |
| Sampling Rate(Per Second) | 500k | 200k |
| Number of A/D Converters | 1 | 1 |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Number of Inputs | 2 | - |
| Input Type | Single Ended | - |
| Data Interface | SPI, Parallel | - |
| Configuration | S/H-ADC | - |
| Ratio - S / H: ADC | 1:1 | - |
| Architecture | SAR | - |
| Reference Type | External, Internal | - |
| Voltage - Supply, Analog | 5V | - |
| Voltage - Supply, Digital | 5V | - |
Frequently asked questions
What are the key differences between the AD7892BRZ-1 and the AD7894AR-2?
The AD7892BRZ-1 is a 12-bit, 500 kSPS successive-approximation ADC with a parallel interface, while the AD7894AR-2 is a 14-bit, 200 kSPS ADC with a serial (SPI-compatible) interface. The AD7892BRZ-1 offers faster throughput and a parallel bus, whereas the AD7894AR-2 provides higher resolution and a serial interface in a smaller package.
Do the AD7892BRZ-1 and AD7894AR-2 have the same resolution and sampling rate?
No. The AD7892BRZ-1 provides 12-bit resolution at up to 500 kSPS, while the AD7894AR-2 provides 14-bit resolution at up to 200 kSPS. The AD7894AR-2 delivers higher resolution but at a lower maximum throughput.
What interface types do these two ADCs use?
The AD7892BRZ-1 uses a parallel microprocessor-compatible interface for direct connection to a parallel data bus. The AD7894AR-2 uses a serial interface compatible with SPI and QSPI protocols, requiring fewer I/O pins.
Are the AD7892BRZ-1 and AD7894AR-2 available in the same package?
No. The AD7892BRZ-1 is supplied in a 24-lead SOIC (R-24) package, while the AD7894AR-2 is supplied in a 16-lead SOIC (R-16) package. The different pin counts and footprints mean they are not drop-in replacements for each other.
What are the analog input voltage ranges for the AD7892BRZ-1 and AD7894AR-2?
The AD7892BRZ-1 offers a selectable input range of ±10 V or ±5 V (bipolar) depending on the input configuration. The AD7894AR-2 provides a ±10 V bipolar input range. Designers should confirm the exact input range configuration against the respective datasheets for their specific grade.
Can the AD7894AR-2 directly replace the AD7892BRZ-1 in an existing design?
No, a direct replacement is not possible. The two devices differ in resolution (12-bit vs 14-bit), sampling rate (500 kSPS vs 200 kSPS), interface type (parallel vs serial), package (24-lead vs 16-lead SOIC), and pinout. Any substitution requires a full redesign of the digital interface, PCB layout, and timing validation.
Which device is better suited for high-speed parallel-bus data acquisition systems?
The AD7892BRZ-1 is better suited for high-speed parallel-bus systems because it offers 500 kSPS throughput and a parallel interface that connects directly to a microprocessor data bus. The AD7894AR-2, with its 200 kSPS rate and serial interface, is better suited to space-constrained or serial-bus designs requiring higher resolution.
What are the typical power supply requirements for the AD7892BRZ-1 and AD7894AR-2?
Both devices operate from a single +5 V supply for their digital and analog core, with the AD7892BRZ-1 additionally requiring a ±5 V or ±10 V analog input range configuration. Designers should verify the exact supply and reference requirements in the respective manufacturer datasheets before finalizing the power design.