Analog Devices Inc. ADA4570WHRZ-RL

Overview

ADA4570WHRZ-RL from Analog Devices is an AEC-Q100 qualified anisotropic magnetoresistive (AMR) angle sensor with integrated signal conditioning, delivering differential sine and cosine analog outputs for precise 0°–180° angular measurement. It features ±0.1° typical dynamic angular error, 850 μV_rms output noise, ratiometric voltage outputs, and operates from 2.7 V to 5.5 V across −40°C to +150°C.

For engineers reviewing the ADA4570WHRZ-RL datasheet, ADA4570WHRZ-RL pinout, ADA4570WHRZ-RL application, or ADA4570WHRZ-RL equivalent, this device serves as a single-chip magnetic angular position sensor for high-reliability automotive and industrial motor control systems requiring fault diagnostics, EMI resistance, and temperature-compensated AMR bridge performance.

Technical Context

The ADA4570WHRZ-RL integrates two dies in one SOIC package: an AMR Wheatstone bridge sensor with 45° relative orientation between bridges, and a fixed-gain instrumentation amplifier ASIC. It produces differential VSIN+/VSIN− and VCOS+/VCOS− outputs referenced to VDD/2, with amplitude synchronism of 99–101% and phase error of 0.85° at 30,000 rpm.

It includes broken bond wire detection that pulls all analog outputs low upon fault, a buffered ratiometric VTEMP output (0–82% VDD over −40°C to +150°C), and supports SAR or Σ-Δ ADC interfacing without external amplification. The architecture uses zero-drift chopper-stabilized amplifiers with 33 nV/√Hz broadband noise and no 1/f component.

Key Specifications

Pinout & Package

ADA4570WHRZ-RL is housed in an 8-lead SOIC_N (R-8) package with standard narrow-body dimensions (5.0 mm × 6.2 mm × 1.75 mm), JEDEC-compliant footprint, and θ_JA = 120°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar AMR angle sensor applications.

Compared with AMS AS5055A and TMAG5170, ADA4570WHRZ-RL uniquely delivers differential ratiometric analog outputs with <2.4 μs propagation delay, on-chip temperature monitoring, and bond-wire fault detection - making it the only option among the three qualified for AEC-Q100 automotive motor control where analog determinism and hardware-level safety are mandatory.

Availability

ADA4570WHRZ-RL is available at Aetrix Electronics and suitable for brushless DC motor control, automotive actuator positioning, and industrial servo applications requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 compliance.

Supply support for ADA4570WHRZ-RL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and automotive markets since 1965.

The ADA4570 product line delivers integrated AMR angle sensors with on-chip signal conditioning for contactless, high-accuracy angular position sensing in demanding automotive and industrial environments.

FAQ

What is the operating temperature range of the ADA4570WHRZ-RL?

The ADA4570WHRZ-RL is rated for −40°C to +150°C operation and is AEC-Q100 qualified for automotive under-hood applications. This extended range is confirmed in the Ordering Guide and Absolute Maximum Ratings tables, distinguishing it from the industrial-grade ADA4570B variants limited to +125°C. The device maintains ±0.7° single-point calibration error across this full span.

Does the ADA4570WHRZ-RL require external components for basic operation?

No, the ADA4570WHRZ-RL operates with only a 100 nF VDD decoupling capacitor. Its differential outputs drive SAR or Σ-Δ ADCs directly, and its ratiometric design allows VDD to serve as the ADC reference. External load resistors and capacitors are optional and only needed if noise filtering or impedance matching is required for specific PCB layouts.

How does the broken bond wire detection work in the ADA4570WHRZ-RL?

The ADA4570WHRZ-RL monitors internal signal nodes between the AMR sensor die and ASIC die. When a bond wire break is detected, the device actively pulls VSIN+, VSIN−, VCOS+, and VCOS− outputs to ground - placing them within the short-circuit diagnostic band shown in Figure 20 of the datasheet. This provides immediate, hardware-level fault signaling without software intervention.

Can the ADA4570WHRZ-RL measure full 360° rotation?

No - the ADA4570WHRZ-RL provides a 0° to 180° measurement range per magnetic revolution. A dipole magnet rotating fully yields two electrical periods (0°–180°–360°), so the raw output repeats every 180°. To resolve 360°, external logic must track direction or use additional sensors; the datasheet explicitly states "the calculated angle repeats every 180° rotation."

What is the purpose of the VTEMP pin on the ADA4570WHRZ-RL?

The VTEMP pin delivers a buffered, ratiometric voltage (0–82% VDD) proportional to the die temperature. It enables real-time thermal compensation of angle measurements and supports closed-loop calibration. When digitized using the same VDD reference as the sine/cosine outputs, VTEMP provides a drift-free temperature reading for algorithms correcting thermal offset and gain drift in the ADA4570WHRZ-RL.