XE88LC05MI000 ETC1 [List of Unclassifed Manufacturers], XE88LC05MI000 Datasheet - Page 32

• Manufacturer Part Number: XE88LC05MI000
• Description: 16 + 10 bit Data Acquisition Ultra Low-Power Microcontroller
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

Data Acquisition Microcontroller
XE88LC05
Figure 8.23:
32
1.2
0.8
0.6
0.4
0.2
1.2
0.8
0.6
0.4
0.2
1
0
1
0
0
0
Normalized Frequency - f *(OSR/f
Normalized Frequency - f *(OSR/f
period OSR/f
number of elementary conversions N
CONV
and are repeated every f
Information on the location of these notches is particularly useful when specific frequencies
must be filtered out by the acquisition system. For example, consider a 5Hz-bandwidth, 16-bit
sensing system where 50Hz line rejection is needed. Using the above equation and the plots
below, we set the 4th notch for N
frequency is then calculated as f
also good attenuation of 50Hz harmonics.
1
1
Frequency response: normalized magnitude vs. frequency for different N
f
NOTCH
Š 2. These notches occur at:
) (
i
=
2
2
OSR
S
. The plots below also show that the frequency response changes with the
i
⋅
⋅
N
N
N
f
ELCONV
ELCONV
ELCONV
S
3
3
S
S
) [-]
) [-]
S
/OSR.
= 1
= 4
(Hz)for
4
4
ELCONV
S
= 20.48kHz for OSR = 512. Notice that this choice yields
i
ELCONV
=
1
2 ,
= 4 to 50Hz, i.e. 1.25Þf
,...,
1.2
0.8
0.6
0.4
0.2
1.2
0.8
0.6
0.4
0.2
performed. In particular, notches appear for N
1
0
1
0
(
N
0
0
ELCONV
Normalized Frequency - f *(OSR/f
Normalized Frequency - f *(OSR/f
−
) 1
1
1
S
/OSR = 50Hz. The sampling
2
2
ELCONV
N
N
ELCONV
ELCONV
3
3
S
S
) [-]
) [-]
D0109-40
= 2
= 8
4
4
EL-