ADA4571 datasheet(13/21 Pages) AD

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Data Sheet

ADA4571

Rev. 0 | Page 13 of 21

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TERMINOLOGY

Reference Position Error

The reference position error is the absolute mounting position

deviation of the sensor from its nominal placement. The

reference position for Y = 0 μm is the straight connection line of

Pin 2 and Pin 7. The X = 0 μm position is referred to the middle

distance of the package top. The position accuracies are within

a precision of ±0.05 mm (±50 μm) in both the X and Y

direction.

Reference Angle Error

The reference angle error is the absolute mounting rotation

deviation of the sensor from its nominal placement. Marking

the position for angle Φ= 0° position is referred parallel to the

straight connection line of Pin 2 and Pin 7.

Figure 25. Bonding Arrangement and Sensor Alignment in Package

Output Amplitude Synchronism Error

The output amplitude matching error (k) is defined as the

relationship between both output channel amplitudes at

continuously rotating magnetic excitation of the MR sensor

mathematically expressed as

k = 100% × VSIN_P-P/VCOS_P-P

Uncorrected Angular Error

The uncorrected angular error is defined as the maximum

deviation from an ideal angle reading, when calculating the

angle from VSIN and VCOS without offset calibration.

Single Point Calibration Angular Error

The single point calibration angular error is defined as the

maximum deviation from an ideal angle reading, when

calculating the angle from VSIN and VCOS after an initial

calibration for offset voltage at TA = 25°C.

Dynamic Angular Error

The dynamic angular error is defined as the maximum

deviation from an ideal angle reading, when calculating the

angle from VSIN and VCOS while a continuous offset calibration is

taken into account.

Phase Error

The phase error (ΦERR) is defined as the rotation frequency

dependent error due to bandwidth limitation of the instrumen-

tation amplifiers. VSIN and VCOS are impacted by the amplifier

propagation delay, referred to the actual angle direction of the

rotating magnetic field. The typical characteristics value can be

used for a first-order compensation of this error on very high

rotations per minute. For low rotational speed systems, this error

component is negligible and no compensation is necessary.

GC 1

VCOS 2

GND 3

VSIN 4

VDD

GND

VTEMP

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