XE8000EV101 Semtech, XE8000EV101 Datasheet - Page 95

• Manufacturer Part Number: XE8000EV101
• Description: EVAL BOARD FOR XE8801AMI027LF
• Manufacturer: Semtech
• Type: MCUr

Specifications of XE8000EV101

• Contents: Fully Assembled Evaluation Board
• For Use With/related Products: XE88LC01AMI027
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

16.6.1
Depending on the application objectives, the user may enable or bypass each PGA stage. This is done according to
the word ENABLE and the coding given in Table 16-13. To reduce power dissipation, the ADC can also be inactivated
while idle.
16.6.2
The first stage can have a buffer function (unity gain) or provide a gain of 10 (see Table 16-14). The voltage V
the output of PGA1 is:
where GD
© Semtech 2005
V
D
1
1
PGA & ADC Enabling
PGA1
is the gain of PGA1 (in V/V) controlled with the bit PGA1_GAIN.
=
GD
1
⋅
V
IN
(V)
PGA3_OFFSET[6:0]
PGA3_GAIN[6:0]
0000000
0000001
0000110
0001100
0010000
0100000
1000000
1111111
0000000
0000001
0000010
0010000
0100000
0111111
1000000
1000001
1000010
1010000
1100000
1111111
Table 16-18 PGA3 offset settings
Table 16-17 PGA3 gain settings
...
...
...
...
...
...
...
...
...
...
...
16-10
127/12(=10.58)
+1/12(=+0.083)
+63/12(=+5.25)
-1/12(=-0.083)
-63/12(=-5.25)
PGA3 Offset
1/12(=0.083)
GDoff
PGA3 Gain
GD
+16/12
+32/12
-16/12
-32/12
+2/12
12/12
16/12
32/12
64/12
-2/12
6/12
3
...
...
...
...
...
...
...
...
0
0
0
(V/V)
3
(V/V)
(Eq. 5)
XE8801A – SX8801R
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