Part A
AD7892BRZ-1
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6270 PCS
- Package
- SOP-24
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The AD7892BRZ-1 and AD7896AR are not drop-in replacements for one another. The AD7892BRZ-1 is a 12-bit successive-approximation ADC with a parallel interface and an on-chip track-and-hold amplifier, while the AD7896AR is a 12-bit ADC with a serial interface and a different analog input architecture. Their differing digital interface, package, and input configuration require board-level redesign, so substitution is not recommended without full validation.
Different digital interface
Different package type
Different input architecture
Different timing requirements
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 | AD7896AR | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so nominal quantization resolution is equivalent for substitutability. |
| Number of Input Channels | 2 (single-ended) | 1 (single-ended) | Channel count determines how many signals can be digitized without external multiplexing. |
| Sampling Rate | 500 kSPS | 100 kSPS | Maximum throughput affects whether the part can handle the required signal bandwidth in the application. |
| Input Type | Single-ended | Single-ended | Input configuration must match the sensor or signal source topology for direct substitution. |
| Supply Voltage | 5 V | 5 V | Supply compatibility ensures the replacement works within the existing power rail design. |
| Interface | Parallel | SPI / Serial | Digital interface type must match the host controller; parallel vs serial is a major architectural difference. |
| Package | 20-Lead SOIC | 8-Lead SOIC | Package footprint and pin count affect PCB layout compatibility and rework feasibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range must cover the application environment for reliable operation. |
| Reference Type | Internal | External | Internal vs external reference changes the surrounding circuit and accuracy budget, affecting drop-in substitutability. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7892BRZ-1 | AD7896AR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 500k | 100k |
| 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 | Supply |
| Voltage - Supply, Analog | 5V | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | 5V | 2.7V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD7892BRZ-1 and the AD7896AR?
The AD7892BRZ-1 is a 12-bit successive-approximation ADC with a 500 kSPS throughput rate, offering a bipolar input range of ±10 V (or ±2.5 V depending on grade) and an on-chip track-and-hold amplifier. The AD7896AR is a 12-bit successive-approximation ADC with a 100 kSPS throughput rate and a single-ended 0 V to VDD input range. The AD7892BRZ-1 provides higher throughput and bipolar input capability, while the AD7896AR offers lower power consumption and a simpler single-ended interface.
Are the AD7892BRZ-1 and AD7896AR pin-compatible?
No. The AD7892BRZ-1 is supplied in a 24-lead SOIC (RW-24) package, while the AD7896AR is supplied in an 8-lead SOIC (R-8) package. The two devices have different pin counts and pin functions, so they are not pin-compatible and cannot be interchanged on the same PCB footprint without redesign.
What are the input voltage ranges of the AD7892BRZ-1 and AD7896AR?
The AD7892BRZ-1 accepts a bipolar analog input range of ±10 V (with the ±10 V input option) and provides an on-chip track-and-hold. The AD7896AR accepts a single-ended unipolar input range from 0 V to VDD, where VDD is the supply voltage (typically 5 V). The input architectures differ fundamentally, so signal conditioning requirements are not interchangeable.
How do the throughput rates of the AD7892BRZ-1 and AD7896AR compare?
The AD7892BRZ-1 offers a throughput rate of 500 kSPS, making it suitable for higher-speed data acquisition applications. The AD7896AR offers a throughput rate of 100 kSPS, which is adequate for lower-speed monitoring and control applications. The five-fold difference in throughput rate is a primary selection criterion between the two devices.
What are the power supply requirements for the AD7892BRZ-1 and AD7896AR?
The AD7892BRZ-1 operates from a single +5 V supply for the analog and digital sections, with an additional ±5 V or ±10 V supply option depending on the input range configuration. The AD7896AR operates from a single +5 V supply (VDD). Both devices are specified for commercial temperature ranges, but the AD7892BRZ-1 includes an on-chip reference option while the AD7896AR requires an external reference.
Do the AD7892BRZ-1 and AD7896AR include an internal voltage reference?
The AD7892BRZ-1 includes an on-chip 2.5 V reference that can be used for the conversion, with the option to override it with an external reference. The AD7896AR does not include an internal reference and requires an external reference voltage to be applied to the REF IN pin for operation. This difference affects system component count and board space.
What are the package and operating temperature specifications for the AD7892BRZ-1 and AD7896AR?
The AD7892BRZ-1 is packaged in a 24-lead SOIC (RW-24) and is specified over the commercial temperature range of 0°C to +70°C (BRZ grade). The AD7896AR is packaged in an 8-lead SOIC (R-8) and is specified over the commercial temperature range of 0°C to +70°C (AR grade). Both are surface-mount SOIC packages, but with different lead counts and footprints.
Can the AD7896AR be used as a drop-in replacement for the AD7892BRZ-1 in an existing design?
No. The AD7896AR cannot be used as a drop-in replacement for the AD7892BRZ-1 due to differences in package pinout (8-lead vs 24-lead SOIC), input range (0 V to VDD single-ended vs ±10 V bipolar), throughput rate (100 kSPS vs 500 kSPS), and reference architecture (external vs on-chip). A redesign of the PCB footprint, signal conditioning, and reference circuitry would be required.