TLE4997

Signal Processing

Data Sheet

19

V 2.08, 2008-09

6.2

Gain Setting

The sensitivity is defined by the range and the gain setting. The output of the A/D

Converter is multiplied with the gain value.

The gain value can be calculated by

:

6.3

Offset Setting

The offset voltage corresponds to an output voltage with zero field at the sensor.

The offset value can be calculated by:

Table 8Gain

Parameter

Symbol Limit Values

Unit

Notes

min.

max.

Register size

G

15

bit

Unsigned integer value

Gain range

Gain

- 4.0

3.9998

-

1)2)

To obtain a flatter output curve, it is recommended to select a higher range setting.

pre-calibrates the samples to 60mV/mT (100mT range) in the final test, but does not guarantee the accuracy

Gain quantization steps

244.14

ppm

Corresponds to 1/4096

Table 9

Offset

Parameter

Symbol Limit Values

Unit

Notes

min.

max.

Register size

OS

15

bit

Unsigned integer value

Offset range

-400

399

%

1)

guarantee the accuracy of this calibration. It is crucial to do a final calibration of each IC within the application

Offset quantization

steps

OS

1.22

mV

@

Gain

G

16384

–

()

4096

------------------------------

=

V

OS

OS

16384

–

()

4096

---------------------------------

V

DD

×

=

_TLE4997x_Data_Sheet.book Page 19 Wednesday, October 1, 2008 5:08 PM