XE8000EV120 Semtech, XE8000EV120 Datasheet - Page 59

• 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

where GD1 is the gain of PGA1 (in V/V) controlled with the bit PGA1_GAIN.
12.7.3. PGA2
The second PGA has a finer gain and offset tuning capability, as shown in Table 45 and Table 46. The voltage VD2 at the
output of PGA2 is given by:
where GD2 and GDoff2 are respectively the gain and offset of PGA2 (in V/V). These are controlled with the words
PGA2_GAIN[1:0] and PGA2_OFFSET[3:0].
ACS - Revision 4.2
©2008 Semtech Corp.
ADVANCED COMMUNICATIONS & SENSING
V
D
2
=
GD
2
⋅
V
(Eq. 6)
D
1
−
GDoff
October 2008
2
⋅
V
REF
PGA2_OFFSET
PGA1_GAIN
PGA2_GAIN
Table 44. PGA1 gain settings
Table 45. PGA2 gain settings
0000
0001
0010
0011
0100
0101
1000
1001
1010
1011
00
01
10
11
0
1
V [ ]
Page 59
PGA2 offset [V/V]
PGA1 gain [V/V]
PGA2 gain [V/V]
High gain acquisition for sensor interface
+0.2
+0.4
+0.6
+0.8
-0.2
-0.4
-0.6
-0.8
10
10
+1
1
1
2
5
0
DATASHEET
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SX8722