參數(shù)資料
型號(hào)： LTC2309IUF#PBF
廠商： Linear Technology
文件頁(yè)數(shù)： 11/26頁(yè)
文件大?。?/td> 0K
描述： IC ADC 12BIT SAR 24-QFN
標(biāo)準(zhǔn)包裝： 91
位數(shù)： 12
采樣率（每秒）： 14k
數(shù)據(jù)接口： I²C，串行
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 15mW
電壓電源： 單電源
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 24-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 24-QFN 裸露焊盤（4x4）
包裝： 管件
輸入數(shù)目和類型： 8 個(gè)單端，單極；8 個(gè)單端，雙極；4 個(gè)差分，單極；4 個(gè)差分，雙極
產(chǎn)品目錄頁(yè)面： 1349 (CN2011-ZH PDF)
配用： DC1337A-ND - BOARD SAR ADC LTC2309
LTC2309
2309fd
AppLICAtIOns InFORMAtIOn
Acquisition
TheLTC2309beginsacquiringtheinputsignalatdif-
ferentinstancesdependingonwhetherareadorwrite
operationisbeingperformed.Ifareadoperationis
beingperformed,acquisitionoftheinputsignalbegins
ontherisingedgeofthe9thclockpulsefollowingthe
addressframe,asshowninFigure13a.
Ifawriteoperationisbeingperformed,acquisitionof
theinputsignalbeginsonthefallingedgeofthesixth
clockcycleaftertheDINwordhasbeenshiftedin,as
shown in Figure 13b. The LTC2309 will acquire the
signalfromtheinputchannelthatwasmostrecently
programmedbytheDINword.Aminimumof240nsis
requiredtoacquiretheinputsignalbeforeinitiatinga
newconversion.
1
2
A6
SDA
SCL
A5
A4
A3
A2
A1
A0 R/W
3
4
5
6
7
8
9
1
2
B11
ACQUISITION BEGINS
tACQ
2309 F13a
B10
1
2
A2
A1
A0 R/W
SDA
SCL
S/D O/S
S1
S0
UNI
X
3
4
5
6
7
8
9
6
7
8
9
ACQUISITION BEGINS
tACQ
2309 F13b
SLP
Figure 13a. Timing Diagram Showing Acquisition During a Read Operation
Figure 13b. Timing Diagram Showing Acquisition During a Write Operation
INPUT VOLTAGE (V)
0V
OUTPUT
CODE
(TWO’S
COMPLEMENT)
–1
LSB
2309 F14
011...111
011...110
000...001
000...000
100...000
100...001
111...110
1
LSB
BIPOLAR
ZERO
111...111
FS/2 – 1LSB
–FS/2
FS = 4.096V
1LSB = FS/212
1LSB = 1mV
INPUT VOLTAGE (V)
OUTPUT
CODE
2309 F15
111...111
111...110
100...001
100...000
000...000
000...001
011...110
011...111
FS – 1LSB
0V
UNIPOLAR
ZERO
FS = 4.096V
1LSB = FS/212
1LSB = 1mV
Figure 14. Bipolar Transfer Characteristics (2’s Complement)
Figure 15. Unipolar Transfer Characteristics (Straight Binary)
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