XE8801AMI027LF Semtech, XE8801AMI027LF Datasheet - Page 94
XE8801AMI027LF
Manufacturer Part Number
XE8801AMI027LF
Description
IC DAS 16BIT FLASH 8K MTP 44LQFP
Manufacturer
Semtech
Datasheet
1.XE8801AMI027LF.pdf
(135 pages)
Specifications of XE8801AMI027LF
Applications
Sensing Machine
Core Processor
RISC
Program Memory Type
FLASH (22 kB)
Controller Series
XE8000
Ram Size
512 x 8
Interface
UART, USRT
Number Of I /o
24
Voltage - Supply
2.4 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
44-LQFP
For Use With
XE8000MP - PROG BOARD AND PROSTART2 CARD
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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16.6
As seen in Figure 16-1, the zooming function is implemented with three programmable gain amplifiers (PGA). These
are:
•
•
•
All gain and offset settings are realized with ratios of capacitors. The user has control over each PGA activation and
gain, as well as the offset of stages 2 and 3. These functions are examined hereafter.
© Semtech 2005
PGA1: coarse gain tuning
PGA2: medium gain and offset tuning
PGA3: fine gain and offset tuning
Programmable Gain Amplifiers
PGA2_OFFSET[3:0]
PGA2_GAIN[1:0]
ENABLE[3:0]
PGA1_GAIN
Table 16-13 ADC & PGA enabling
Table 16-16 PGA2 offset settings
Table 16-14 PGA1 Gain Settings
0000
0001
0010
0011
0100
0101
1001
1010
1011
1100
1101
xxx0
xxx1
xx0x
xx1x
x0xx
x1xx
0xxx
1xxx
Table 16-15 PGA2 gain settings
00
01
10
11
0
1
16-9
PGA1 disabled
PGA2 disabled
PGA3 disabled
PGA1 enabled
PGA2 enabled
PGA3 enabled
ADC disabled
ADC enabled
PGA2 Offset
GDoff
PGA1 Gain
PGA2 Gain
GD
GD
Block
+0.2
+0.4
+0.6
+0.8
-0.2
-0.4
-0.6
-0.8
1
2
10
10
+1
-1
1
1
2
5
0
(V/V)
(V/V)
2
(V/V)
XE8801A – SX8801R
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