參數(shù)資料
型號(hào): SX8725E083TDT
廠商: Semtech
文件頁(yè)數(shù): 13/53頁(yè)
文件大?。?/td> 0K
描述: IC DAS PRESS/TEMP SENS 12MLPD
標(biāo)準(zhǔn)包裝: 1
系列: ZoomingADC™
類型: 數(shù)據(jù)采集系統(tǒng)(DAS)
輸入類型: 差分
輸出類型: 數(shù)字
接口: I²C
安裝類型: 表面貼裝
封裝/外殼: 12-WFDFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 12-MLPD
包裝: 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁(yè)面: 585 (CN2011-ZH PDF)
其它名稱: SX8725E083TDTDKR
ADVANCED COMMUNICATIONS & SENSING
V1.8 2009 Semtech Corp.
www.semtech.com
20
SX8725
ZoomingADC for Pressure and Temperature Sensing
Programmable Gain Amplifiers
As seen in Figure 8, the zooming function is implemented with three programmable gain amplifiers (PGA).
These are:
PGA1: coarse gain tuning
PGA2: medium gain and offset tuning
PGA3: fine gain and offset tuning. Should be set ON for high linearity data acquisition
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.
ENABLE[3:0]
(RegACCfg1[3:0])
Block
xxx0
ADC disabled
xxx1
ADC enabled
xx0x
PGA1 disabled
xx1x
PGA1 enabled
x0xx
PGA2 disabled
x1xx
PGA2 enabled
0xxx
PGA3 disabled
1xxx
PGA3 enabled
Table 4 - ADC & PGA Enabling
PGA1_GAIN
(RegACCfg3[7])
PGA1 Gain
GD1 (V/V)
0
1
10
Table 5 - PGA1 Gain Settings
PGA2_GAIN[1:0]
(RegACCfg2[5:4])
PGA2 Gain
GD2 (V/V)
00
1
01
2
10
5
11
10
Table 6 - PGA2 Gain Settings
PGA2_OFFSET[3:0]
(RegACCfg2[3:0])
PGA2 Offset
GDoff2 (V/V)
0000
0
0001
+0.2
0010
+0.4
0011
+0.6
0100
+0.8
0101
+1
1001
-0.2
1010
-0.4
1011
-0.6
1100
-0.8
1101
-1
Table 7 - PGA2 Offset Settings
PGA3_GAIN[6:0]
(RegACCfg3[6:0])
PGA3 Gain
GD3 (V/V)
0000000
0
0000001
1/12(=0.083)
...
0000110
6/12
...
0001100
12/12
0010000
16/12
...
0100000
32/12
...
1000000
64/12
...
1111111
127/12(=10.58)
Table 8 - PGA3 Gain Settings
PGA3_OFFSET[6:0]
(RegACCfg4[6:0])
PGA3 Offset
GDoff3 (V/V)
0000000
0
0000001
+1/12(=+0.083)
0000010
+2/12
...
0010000
+16/12
...
0100000
+32/12
...
0111111
+63/12(=+5.25)
1000000
0
1000001
-1/12(=-0.083)
1000010
-2/12
...
1010000
-16/12
...
1100000
-32/12
...
1111111
-63/12(=-5.25)
Table 9 - PGA3 Offset Settings
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