tle4997i Infineon Technologies Corporation, tle4997i Datasheet - Page 18

• Manufacturer Part Number: tle4997i
• Description: Programmable Linear Hall Sensor For Industrial Use
• Manufacturer: Infineon Technologies Corporation

6.4
A digital low pass filter is placed between the Hall ADC and the DSP, this is useful to
reduce the noise level.
It has a constant DC amplification of 0dB (this is excactly a gain of 1) which means its
setting has no influence on the internal Hall ADC value.
The bandwidth can be set in 8 steps.
Table 10
0
1
2
3
4
5
6
7
1)
2)
Table 11
Parameter
Register size
Corner frequency
variation
Note: In Range 7 (filter off), the output noise increases. Because of higher DSP load,
Preliminary Data Sheet
Note: Parameter LP
As this is a digital filter running with an RC-based oscillator, the cutoff frequency may vary within ±30%.
The output low pass-interpolation filter behavior remains as main component in the signal path.
also the current consumption rises slightly.
DSP Input Low Pass Filter
Low pass filter setting
Range
Symbol Limit Values
LP
∆
f
min.
- 30
Cutoff frequency in Hz (at 3dB attenuation)
78
244
421
615
826
1060
1320
off
2)
18
3
max.
+ 30
Unit
bit
%
Notes
Signal Processing
V 1.01, 2006-09
TLE4997I
1)