XE8000EV120 Semtech, XE8000EV120 Datasheet - Page 43

• Manufacturer Part Number: XE8000EV120
• Description: BOARD EVAL FOR SX8722I070TRLF
• Manufacturer: Semtech
• Series: ZoomingADC™r

Specifications of XE8000EV120

• Number Of Adc's: 1
• Number Of Bits: 16
• Data Interface: I²C
• Inputs Per Adc: 7 Single or 4 Differential
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Utilized Ic / Part: SX8722
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: XM8000EV120; XM8000EV120

11.4. Filtering
11.4.1. Filter types
There are 2 different filtering types:
1. Average filtering.
2. Moving average filtering.
The average filtering is an addition of n values divided by n, this kind of filter is useful when having a very noisy signal; the
maximum average value is 256.
Advantage: Reduces noise due to the high quantity of samples.
Disadvantage: Takes the acquisition time of n samples to have a result.
The sliding window averaging is a filter that takes the n last measurements and gives the mean value of them.
Important note:
11.4.2. Configuration register - filtering
This register is present in each configuration; the bits 4 to 6 are controlling the filtering mode.
The table below shows the filter selection.
ACS - Revision 4.2
©2008 Semtech Corp.
ADVANCED COMMUNICATIONS & SENSING
CxSXCfg
Advantage: result on each acquisition.
Disadvantage: limited at ten samples. Additional delay.
Register
Table 27. Filtering mode in configuration registers; addresses 0x10, 0x30, 0x50, 0x70
and the over sampling rate (OSR) are set to their maximum.
The ADC filtering is faster, these additional filters should be used only if the number of conversion (N
reserved
7
October 2008
6
FILTER TYPE[2:0]
Code
000
001
010
011
5
Table 28. Filter selection
Filter type [6:4]
none
average filtering
moving average filtering
reserved
Page 43
4
Mode
High gain acquisition for sensor interface
ALRM1
3
ALRM2
2
SINGLE
1
DATASHEET
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SX8722
CONT
ELCONV
0
)