XE8000EV120 Semtech, XE8000EV120 Datasheet - Page 63

• 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

12.8.2. Sampling Frequency
The word F
frequency f
their control can be found in the clock block documentation.
12.8.3. Over-Sampling Ratio
The over-sampling ratio (OSR) defines the number of integration cycles per elementary conversion. Its value is set with the
word SET_OSR[2:0] in power of 2 steps (see Table 49) given by:
ACS - Revision 4.2
©2008 Semtech Corp.
ADVANCED COMMUNICATIONS & SENSING
RCEXT
OSR
IN
[1:0] is used to select the sampling frequency f
can be chosen. For F
=
Conversion index
2
3
+
(Eq. 13)
SET_OSR[2
Table 49. Sampling frequency settings (f
Init
Offset
Conversion
Elementary
October 2008
Figure 33. Analog-to-digital conversion sequence
1
+
IN
:
0]
= "11", sampling frequency is about 8 kHz. Additional information on oscillators and
(RegACCfg[4:2])
SET_OSR[2:0]
T
ELCONV
FIN[1:0]
Conversion
Elementary
000
001
00
01
10
11
= (OSR+1)/f
2
-
T
Page 63
S
CONV
Sampling frequency Fs
Over-Sampling Ratio
S
Conversion
Elementary
N
(Table 49). Three sub-multiples of the internal RC-based
ELCONV
1/32 f
1/64 f
1/4 f
1/8 f
OSR [-]
+
High gain acquisition for sensor interface
RC
[Hz]
16
8
- 1
RC
RC
= RC-based frequency)
RC
RC
Conversion
Elementary
N
ELCONV
-
End
Conversion
Result
DATASHEET
www.semtech.com
SX8722