Part A
AD7892BRZ-1
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6270 個数
- Package
- SOP-24
- 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 AD7892BRZ-1 and AD7892AR-3 are both 12-bit successive-approximation ADCs from the AD7892 family, sharing a compatible functional architecture and pinout. However, they differ in speed grade, package and temperature rating, and specified linearity, so the AD7892AR-3 can serve as a functional substitute for the AD7892BRZ-1 only after validating the application's timing margin, thermal environment, and accuracy budget against the lower-grade specifications.
Resolution and Architecture
High match
Conversion Speed Grade
Validation required
Package and Temperature Range
Validation required
Linearity and Accuracy Grade
Validation required
Parts at a glance
Part B
AD7892AR-3
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 666 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 | AD7892BRZ-1 | AD7892AR-3 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so conversion resolution is equivalent and does not affect substitutability. |
| Number of Input Channels | 2 (single-ended) | 2 (single-ended) | Channel count determines how many analog signals can be multiplexed into the converter. |
| Sampling Rate | 500 kSPS | 500 kSPS | Maximum throughput must meet the system's signal bandwidth and Nyquist requirements. |
| Input Voltage Range | ±10 V (bipolar) | ±10 V (bipolar) | The analog input span must match the sensor or signal conditioning output to avoid clipping or loss of dynamic range. |
| Supply Voltage | 5 V single supply | 5 V single supply | Supply compatibility ensures the part can drop into the same power rail without redesign. |
| Interface Type | Parallel | Parallel | The digital interface must match the host processor's bus to allow direct connection. |
| Package / Mounting | 20-Lead SOIC (surface mount) | 20-Lead SOIC (surface mount) | Package and footprint compatibility determine whether the part can be placed on the same PCB land pattern. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature grade must cover the application's environmental conditions for reliable operation. |
| Reference Type | Internal reference | Internal reference | An internal reference simplifies the design and affects accuracy and drift performance. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7892BRZ-1 | AD7892AR-3 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 500k | 600k |
| 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 AD7892AR-3?
The AD7892BRZ-1 is specified for a 5 V supply with a 0 V to 2.5 V input range and is offered in a 24-lead SOIC package with an operating temperature range of -40°C to +85°C. The AD7892AR-3 is specified for a 5 V supply with a ±2.5 V input range and is offered in a 24-lead SOIC package with an operating temperature range of -40°C to +85°C. The primary differences are the analog input range and the grade/performance designation.
Are the AD7892BRZ-1 and AD7892AR-3 pin-compatible?
Both devices are offered in the same 24-lead SOIC package, and the pin functions are defined by the AD7892 datasheet. However, because the analog input ranges differ (0 V to 2.5 V for the BRZ-1 versus ±2.5 V for the AR-3), the input configuration and external signal conditioning must be verified against the datasheet before any substitution.
What is the resolution and conversion time of these AD7892 devices?
Both the AD7892BRZ-1 and AD7892AR-3 are 12-bit successive-approximation ADCs with a conversion time of 1.47 µs typical, as specified in the AD7892 datasheet. The devices also include a track-and-hold amplifier and an on-chip reference.
What analog input range does each device support?
The AD7892BRZ-1 supports a 0 V to 2.5 V unipolar input range, while the AD7892AR-3 supports a ±2.5 V bipolar input range. The input range is determined by the specific model suffix and must be matched to the application's signal swing.
What is the operating temperature range for the AD7892BRZ-1 and AD7892AR-3?
Both the AD7892BRZ-1 and AD7892AR-3 are specified over the industrial temperature range of -40°C to +85°C, per the AD7892 datasheet.
Can the AD7892BRZ-1 be used as a drop-in replacement for the AD7892AR-3?
Not directly. Although both are 12-bit AD7892 devices in a 24-lead SOIC package, the AD7892BRZ-1 has a 0 V to 2.5 V input range while the AD7892AR-3 has a ±2.5 V input range. The input signal conditioning, reference configuration, and system calibration must be revalidated against the AD7892 datasheet before substitution.
What interface and power supply do these devices require?
Both the AD7892BRZ-1 and AD7892AR-3 operate from a single 5 V supply and provide a parallel digital interface, as specified in the AD7892 datasheet. The devices also include an on-chip reference and a track-and-hold amplifier.