Part A
ADA4571BRZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4629 個数
- Package
- SOP-8
- Series
- 位置センサー - 角度、直線位置測定
Replacement verdict
Not a drop-in replacement
The ADA4522-2ARZ-R7 and ADA4571BRZ serve fundamentally different functions and cannot be treated as interchangeable substitutes. The ADA4522-2ARZ-R7 is a dual zero-drift operational amplifier, while the ADA4571BRZ is an integrated AMR angle sensor with analog output. Their differing signal chain roles, output characteristics, supply requirements, and package configurations make direct substitution impractical without redesign.
Different device function
Different output type
Different supply range
Different package type
Parts at a glance
Part B
ADA4522-2ARZ-R7
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 3731 個数
- Package
- SOP-8
- Series
- リニアアンプ - 計装用、オペアンプ、バッファアンプ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADA4522-2ARZ-R7 | ADA4571BRZ | Why it matters |
|---|---|---|---|
| Amplifier Type | Zero-drift operational amplifier (dual) | Anisotropic magnetoresistive (AMR) angle sensor amplifier | The two parts serve fundamentally different functions; one is a general-purpose op-amp and the other is a signal-conditioning amplifier for an AMR sensor, so they are not functionally interchangeable. |
| Number of Channels | 2 | 1 (single sensor signal path) | Channel count determines how many independent signal paths can be processed in one package, affecting board layout and channel density. |
| Supply Voltage Range | 4.5 V to 55 V (single supply) | 2.7 V to 5.5 V | The supply range must match the system rail; the wide-voltage ADA4522 suits high-voltage industrial rails while the ADA4571 targets low-voltage sensor systems. |
| Input Offset Voltage (max) | 5 µV | Not applicable (sensor output amplifier) | Low offset is critical for precision DC amplification; the ADA4522's zero-drift architecture provides microvolt-level offset, whereas the ADA4571 is specified for angle accuracy rather than op-amp offset. |
| Input Offset Voltage Drift | 0.022 µV/°C (typical) | Not applicable | Drift determines stability over temperature; zero-drift amplifiers like the ADA4522 maintain precision across temperature, which is not a relevant spec for the sensor amplifier. |
| Gain Bandwidth Product | 2.7 MHz | Not applicable (fixed sensor signal conditioning) | GBW sets the achievable closed-loop bandwidth for an op-amp; the ADA4571's signal path is optimized for AMR sensor conditioning rather than general-purpose gain-bandwidth. |
| Input Noise Density | 5.8 nV/√Hz (typical) | Not applicable | Low input noise is essential for resolving small signals; the ADA4522's low noise suits precision sensing, while the ADA4571 is characterized by angle error rather than voltage noise density. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Both parts share the same industrial temperature range, so thermal environment compatibility is equivalent. |
| Package | 8-lead SOIC (R-8) | 8-lead SOIC (R-8) | Package footprint affects PCB layout and assembly; identical SOIC-8 packages allow similar board space but do not imply functional interchangeability. |
| Primary Application | Precision instrumentation, current sensing, sensor signal conditioning | Magnetic angle/position sensing with AMR sensors | Application focus determines whether a part can substitute in a given circuit; these two target different end uses and are not drop-in replacements. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADA4571BRZ | ADA4522-2ARZ-R7 |
|---|---|---|
| Part Status | Active | Active |
| For Measuring | Angle | - |
| Technology | Hall Effect | - |
| Rotation Angle - Electrical Mechanical | 180° (±90°), Continuous | - |
| Output | Analog Voltage | - |
| Output Signal | Cosine, Sine | - |
| Actuator Type | External Magnet, Not Included | - |
| Voltage - Supply | 2.7V ~ 5.5V | - |
| Mounting Type | Surface Mount | Surface Mount |
| Termination Style | Gull Wing | - |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
| Amplifier Type | - | Zero-Drift |
| Number of Circuits | - | 2 |
| Output Type | - | Rail-to-Rail |
| Slew Rate | - | 1.7V/µs |
| Gain Bandwidth Product | - | 2.7 MHz |
| -3 dB Bandwidth | - | 6.5 MHz |
| Current - Input Bias | - | 50 pA |
| Voltage - Input Offset | - | 1.5 µV |
| Supply Current | - | 830µA (x2 Channels) |
| Current - Output / Channel | - | 32 mA |
| Voltage - Supply Span(Min) | - | 4.5 V |
| Voltage - Supply Span(Max) | - | 55 V |
Frequently asked questions
What are the fundamental functional differences between the ADA4522-2ARZ-R7 and the ADA4571BRZ?
The ADA4522-2ARZ-R7 is a dual, zero-drift, low-noise operational amplifier designed for precision signal conditioning. The ADA4571BRZ is an integrated AMR (Anisotropic Magnetoresistive) angle sensor with integrated signal conditioning amplifiers, designed for magnetic position measurement. They serve entirely different functions and are not interchangeable.
Are the ADA4522-2ARZ-R7 and ADA4571BRZ pin-compatible or package-compatible?
No. The ADA4522-2ARZ-R7 is supplied in an 8-lead SOIC package (SOIC_N), while the ADA4571BRZ is supplied in an 8-lead SOIC package with a different pinout dedicated to sensor outputs, supply, and gain setting. The pin functions and internal circuitry differ completely, so they cannot be substituted on the same PCB land pattern without redesign.
Can the ADA4522-2ARZ-R7 be used to amplify the output of the ADA4571BRZ?
Yes, in principle. The ADA4571BRZ provides differential analog voltage outputs proportional to the magnetic field angle, and the ADA4522-2ARZ-R7 is a precision zero-drift op amp suitable for low-level signal amplification. However, the system designer must verify gain, bandwidth, offset, and noise requirements against the ADA4571BRZ output characteristics and the ADA4522-2ARZ-R7 datasheet specifications.
What are the key supply voltage requirements for each device?
The ADA4522-2ARZ-R7 operates from a single supply of 4.5 V to 55 V or a dual supply of ±2.25 V to ±27.5 V. The ADA4571BRZ operates from a single supply of 2.7 V to 5.5 V. These supply ranges are not directly compatible; a common system supply must be validated against both datasheets.
Which device is intended for magnetic angle sensing applications?
The ADA4571BRZ is the magnetic angle sensor, integrating AMR sensing elements with signal conditioning to provide an analog output representing the angle of an applied magnetic field. The ADA4522-2ARZ-R7 is a general-purpose precision operational amplifier and does not contain magnetic sensing elements.
How do the operating temperature ranges compare?
Both the ADA4522-2ARZ-R7 and the ADA4571BRZ are specified for the industrial temperature range of −40°C to +125°C, per their respective manufacturer datasheets. Designers should still confirm application-specific thermal derating and performance limits within that range.
What are the typical noise characteristics of the ADA4522-2ARZ-R7 compared with the ADA4571BRZ?
The ADA4522-2ARZ-R7 is specified with a low voltage noise density of approximately 5.8 nV/√Hz at 1 kHz, making it suitable for precision low-noise amplification. The ADA4571BRZ datasheet specifies its output noise and signal conditioning characteristics for angle-sensing accuracy rather than op-amp voltage noise density. Direct noise comparison is not meaningful because the devices serve different functions.