ADAF1080BCPZ datasheet(18/36 Pages) AD

18 / 36 page

Data Sheet

ADAF1080

TERMINOLOGY

analog.com

Rev. 0 | 18 of 36

BSENSE

BSENSE is defined as the magnetic field vector in parallel with the

sense field axis of the sensor and in-plane with the package of

the sensor. Figure 41 shows the sense field axis relative to the

ADAF1080 package.

Figure 41. Sense Field Axis and Cross Field Axis

SDEVICE

SDEVICE is the magnetic sensitivity of the device defined as the

proportional change of the voltage output of the sensor due to a

change in the applied magnetic field on the sense field axis at TA =

25°C, as shown in Figure 41.

SCOEFF1

SCOEFF1 is the best-fit coefficient for a first-order linear fit of the

magnetic sensitivity of the device (SDEVICE) in the sense field axis

for each of the three ranges shown in Table 2, Table 3, and Table 4.

SCOEFF1 = Linear Best Fit(BSENSE vs. VOUT)

SCOEFF3

SCOEFF3 is the third-order coefficient used to compensate nonlinear-

ity of the output of the ADAF1080.

SERROR

SERROR is the sensitivity error defined as the difference between

the measured sensitivity of the device (SDEVICE) and the ideal

sensitivity (SCOEFF1). SERROR is expressed as a percentage of the

ideal sensitivity and is mathematically defined as follows:

SERROR= SDEVICE−SCOEFF1

SCOEFF1

×100

SDEVICE_T

SDEVICE_T is the measured sensitivity for the device at the operating

temperature.

SERROR_TC

SERROR_TC is the sensitivity error over temperature and is defined

as difference between the measured sensitivity of a device at the

operating temperature against the measured sensitivity at TA =

25°C, SDEVICE. SERROR_TC is expressed as a percentage of the

ideal sensitivity and is mathematically defined as follows:

SERROR_TC= SDEVICE_T−SDEVICE

SCOEFF1

×100

Full-Scale Range (FSR)

The FSR of a bipolar measurement is defined as the variation of

the output voltage when the highest valid positive and negative

magnetic fields are applied in the application.

The FSR of a ±8 mT magnetic field range is the change in output

voltage over a 16 mT range.

The FSR of a unipolar measurement is equivalent to the variation of

the output voltage between 0 mT and the highest absolute value of

the magnetic field range.

The FSR of a 0 mT to 8 mT range is the change in output voltage

over an 8 mT range.

LERROR

LERROR is the percentage linearity error and is defined as the worst

case deviation of VOUT from the expected VOUT based on SCOEFF1

across the operating magnetic field range. LERROR does not include

offset error, sensitivity error, temperature related errors, or noise.

LERROR is expressed as a percentage of the output voltage FSR

and is mathematically defined as follows:

LERROR= SCOEFF1×BSENSE−SDEVICE×BSENSE

FSR

×100

Cross Field (BCROSS)

BCROSS is defined as the magnetic field vector perpendicular to, and

in plane with, the sense field axis of the sensor.

The component of the magnetic field vector out of plane of the

package is not considered as cross field because it does not affect

the sensor, and it can be ignored. Figure 41 outlines this cross field

axis relative to the ADAF1080 package.

Stray Field

Stray field is any interferer magnetic field that is measurable on the

sense field axis of the ADAF1080 but is not the target magnetic

field to be measured. These interferers can be generated by a

nearby magnet, a current into a conductor, the influence of a

nearby ferromagnetic material, or the magnetic field of the earth.

The ADAF1080 cannot differentiate between stray fields and target

fields. Therefore, PCB and system board layout and component

placement is critical to minimize stray fields and to achieve optimal

measurement results as described in the Recommended PCB

Layout section.

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