TLE4997 datasheet(19/36 Pages) INFINEON

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TLE4997I

Signal Processing

Data Sheet

V 1.0, 2007-06

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.

bit

Unsigned integer value

Gain range

Gain

- 4.0

3.9998

1)2)

1) For gain values between - 0.5 and + 0.5, the numeric accuracy decreases.

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

2) A gain value of +1.0 corresponds to a typical 40 mV/mT sensitivity (100 mT range, not guaranteed). It is crucial

to do a final calibration of each IC within the application using the Gain/VOS value.

Gain quantization steps

∆Gain

244.14

ppm

Corresponds to 1/4096

Table 9

Offset

Parameter

Symbol Limit Values

Unit

Notes

min.

max.

bit

Unsigned integer value

Offset range

VOS

-400

399

VDD

1) It is crucial to do a final calibration of each IC within the application using the Gain/V

OS value.

Offset quantization

steps

∆V

1.22

VDD = 5 V

generally VDD / 4095

Gain

16384

–

()

4096

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

16384

–

()

4096

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

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