Part A
ADA4571BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4629 PCS
- Package
- SOP-8
- Series
- Position Sensors - Angle, Linear Position Measuring
Replacement verdict
Not a drop-in replacement
The ADA4522-2ARZ-RL and ADA4571BRZ serve fundamentally different functions and cannot be treated as interchangeable. The ADA4522-2ARZ-RL is a dual zero-drift operational amplifier, while the ADA4571BRZ is an anisotropic magnetoresistive (AMR) angle sensor with integrated signal conditioning. Their differing output types, channel configurations, supply requirements, and package footprints make direct substitution impractical without a complete redesign of the surrounding circuit.
Different output type
Different channel count
Different footprint
Different supply requirements
Parts at a glance
Part B
ADA4522-2ARZ-RL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4804 PCS
- Package
- SOP-8
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
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-RL | ADA4571BRZ | Why it matters |
|---|---|---|---|
| Amplifier Type / Function | Dual zero-drift operational amplifier (voltage feedback) | Integrated AMR (anisotropic magnetoresistive) angle sensor with signal conditioning amplifier | These are fundamentally different device classes; one is a general-purpose op-amp and the other is a magnetic angle sensor, so they are not functionally substitutable. |
| Input Offset Voltage (max) | 5 µV (typical zero-drift performance) | Not applicable (sensor output, not an op-amp offset spec) | Offset voltage determines DC precision in signal chains; the op-amp has a defined ultra-low offset while the sensor does not specify an equivalent op-amp offset. |
| Supply Voltage Range | 4.5 V to 55 V (single supply) | 2.7 V to 5.5 V | Supply range dictates compatibility with the system rail; the op-amp supports high-voltage rails while the sensor is limited to low-voltage logic supplies. |
| Number of Channels / Outputs | 2 (dual op-amp) | 2 analog outputs (cosine and sine) | Channel count affects how many signal paths can be processed; the dual op-amp provides two independent amplifier channels, whereas the sensor provides sine/cosine outputs for angle computation. |
| Gain Bandwidth Product | 2.7 MHz | Not applicable (sensor signal conditioning, no GBP spec) | GBP sets the achievable closed-loop bandwidth for an op-amp; the sensor does not have an equivalent GBP specification. |
| Input Noise Density | 5.6 nV/√Hz (typical) | Not applicable (sensor noise characterized differently) | Low noise density is critical for precision amplification; the sensor's noise is not specified in the same op-amp input-referred terms. |
| Operating Temperature Range | −40 °C to +125 °C | −40 °C to +125 °C | Both 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; both use the same 8-lead SOIC, easing board-level interchangeability of the footprint. |
| Primary Application | Precision instrumentation, sensor signal conditioning, current sensing | Magnetic angle/position sensing (motor commutation, rotary position) | Intended application defines functional role; the op-amp is a general precision building block while the sensor is a dedicated angle-measurement device. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADA4571BRZ | ADA4522-2ARZ-RL |
|---|---|---|
| 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-RL and the ADA4571BRZ?
The ADA4522-2ARZ-RL 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 an integrated signal conditioning amplifier, designed for magnetic position measurement. They serve entirely different functions and are not interchangeable.
Can the ADA4522-2ARZ-RL be used as a direct replacement for the ADA4571BRZ in a magnetic sensing circuit?
No. The ADA4571BRZ includes AMR sensor elements and outputs a differential signal proportional to the magnetic field angle. The ADA4522-2ARZ-RL is a general-purpose operational amplifier with no magnetic sensing capability. Substituting one for the other would render the circuit nonfunctional.
How do the supply voltage requirements of the ADA4522-2ARZ-RL and ADA4571BRZ compare?
The ADA4522-2ARZ-RL operates from a wide dual supply range of ±2.5 V to ±27.5 V (or 5 V to 55 V single supply). The ADA4571BRZ operates from a single supply of 2.7 V to 5.5 V. The ADA4522-2ARZ-RL supports significantly higher supply voltages than the ADA4571BRZ.
What are the package and pinout differences between the ADA4522-2ARZ-RL and ADA4571BRZ?
The ADA4522-2ARZ-RL is supplied in an 8-lead SOIC package (SOIC_N). The ADA4571BRZ is supplied in an 8-lead SOIC package as well, but the pin functions differ completely due to the different device functions. The ADA4522-2ARZ-RL pinout includes two op-amp channels with IN+, IN−, OUT, and power pins, while the ADA4571BRZ pinout includes sensor bridge outputs, temperature sensor output, and supply/ground pins. They are not pin-compatible.
Which device is suitable for precision low-offset amplification, and which is suitable for contactless angle measurement?
The ADA4522-2ARZ-RL is suitable for precision low-offset amplification due to its zero-drift architecture, low offset voltage, and low noise. The ADA4571BRZ is suitable for contactless angle measurement because it integrates AMR sensor elements and signal conditioning to provide an output proportional to magnetic field angle.
Do the ADA4522-2ARZ-RL and ADA4571BRZ share the same operating temperature range?
Both devices are specified for the industrial temperature range of −40°C to +125°C. However, their electrical performance over temperature differs according to their respective datasheets, and each must be evaluated against its own specifications for the target application.
Are the ADA4522-2ARZ-RL and ADA4571BRZ both available in RoHS-compliant packaging?
Yes. Both the ADA4522-2ARZ-RL and the ADA4571BRZ are offered in RoHS-compliant, halogen-free SOIC packages as indicated by their respective manufacturer datasheets and distributor listings. Designers should confirm the specific ordering code and compliance documentation for their production requirements.