) 8 Single-Ended + 4 Di" />
參數(shù)資料
型號: DC1337A
廠商: Linear Technology
文件頁數(shù): 3/26頁
文件大?。?/td> 0K
描述: BOARD SAR ADC LTC2309
軟件下載: QuikEval System
設(shè)計資源: DC1337A Design File
DC1337A Schematic
標(biāo)準包裝: 1
系列: QuikEval™
ADC 的數(shù)量: 1
位數(shù): 12
采樣率(每秒): 14k
數(shù)據(jù)接口: I²C,串行
在以下條件下的電源(標(biāo)準): 1.5mW @ 1kSPS
已用 IC / 零件: LTC2309
已供物品:
相關(guān)產(chǎn)品: LTC2309IUF#TRPBF-ND - IC ADC 12BIT SAR 24-QFN
LTC2309IF#TRPBF-ND - IC ADC 12BIT SAR 20-TSSOP
LTC2309IF#PBF-ND - IC ADC 12BIT SAR 20-TSSOP
LTC2309HF#TRPBF-ND - IC ADC 12BIT SAR 20-TSSOP
LTC2309HF#PBF-ND - IC ADC 12BIT SAR 20-TSSOP
LTC2309CUF#TRPBF-ND - IC ADC 12BIT SAR 24-QFN
LTC2309CF#TRPBF-ND - IC ADC 12BIT SAR 20-TSSOP
LTC2309CF#PBF-ND - IC ADC 12BIT SAR 20-TSSOP
LTC2309IUF#PBF-ND - IC ADC 12BIT SAR 24-QFN
LTC2309CUF#PBF-ND - IC ADC 12BIT SAR 24-QFN
LTC2309
2309fd
AppLICAtIOns InFORMAtIOn
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM (
)
8 Single-Ended
+
4 Differential
+ ()
+
+ ()
(+)
COM (
)
Combinations of Differential
and Single-Ended
+
{
2309 F01a
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
Table 1. Channel Configuration
S/D O/S S1 S0
0
1
2
3
4
5
6
7 COM
0
+
0
1
+
0
1
0
+
0
1
+
0
1
0
+
0
1
0
1
+
0
1
0
+
0
1
+
1
0
+
1
0
1
+
1
0
1
0
+
1
0
1
+
1
0
+
1
0
1
+
1
0
+
1
+
COM
(UNUSED)
COM (
)
1st Conversion
2nd Conversion
+
+
+
+
{
CH2
CH3
CH4
CH5
CH2
CH3
CH4
CH5
2328 F01b
COM
REFCOMP/2
Unipolar Mode
Bipolar Mode
2328 F02
+–
Figure 1a. Example of MUX Configurations
Figure 1b. Changing the MUX Assignments “On the Fly”
Figure 2. Driving COM in Unipolar and Bipolar Modes
mode,theanaloginputsdrawonlyasmallleakagecur-
rent.Ifthesourceimpedanceofthedrivingcircuitis
low,theADCinputscanbedrivendirectly.Otherwise,
moreacquisitiontimeshouldbeallowedforasource
withhigherimpedance.
Input Filtering
The noise and distortion of the input amplifier and
othercircuitrymustbeconsideredsincetheywilladd
totheADCnoiseanddistortion.Therefore,noisyinput
circuitryshouldbefilteredpriortotheanaloginputsto
minimizenoise.Asimple1-poleRCfilterissufficient
formanyapplications.
TheanaloginputsoftheLTC2309canbemodeledas
a55pFcapacitor(CIN)inserieswitha100resistor
(RON),asshowninFigure3a.CINgetsswitchedtothe
selectedinputonceduringeachconversion.Largefilter
RCtimeconstantswillslowthesettlingoftheinputs.
ItisimportantthattheoverallRCtimeconstantsbe
shortenoughtoallowtheanaloginputstocompletely
settleto12-bitresolutionwithintheacquisitiontime
(tACQ)ifDCaccuracyisimportant.
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