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| 型号： | LTC2309IF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/26页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT SAR 20-TSSOP |
| 标准包装： | 74 |
| 位数： | 12 |
| 采样率（每秒）： | 14k |
| 数据接口： | I²C，串行 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 15mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-TSSOP |
| 包装： | 管件 |
| 输入数目和类型： | 8 个单端，单极；8 个单端，双极；4 个差分，单极；4 个差分，双极 |
| 配用： | DC1337A-ND - BOARD SAR ADC LTC2309 |
LTC2309
2309fd
Input Data Format
WhentheLTC2309isaddressedforawriteoperation,
itacknowledgesbypullingSDALOWduringtheLOW
periodbeforethe9thcycleandactsasareceiver.The
master/transmittercanthensend1bytetoprogramthe
device.Theinputbyteconsistsofthe6-bitDINword
followedbytwobitsthatareignoredbytheADCand
are considered don’t cares (X) (see Figure8b). The
inputbitsarelatchedontherisingedgeofSCLduring
thewriteoperation.
After power-up, the ADC initiates an internal reset
cyclewhichsetstheDINwordtoall0s(S/D=O/S=
S0=S1=UNI=SLP=0).Awriteoperationmaybe
performedifthedefaultstateoftheADC’sconfiguration
isnotdesired.Otherwise,theADCmustbeproperly
addressedandfollowedbyaSTOPconditiontoinitiate
aconversion.
Initiating a New Conversion
TheLTC2309awakensfromeithernaporsleepwhen
properlyaddressedforaread/writeoperation.ASTOP
command may then be issued after performing the
read/writeoperationtotriggeranewconversion.
IssuingaSTOPcommandafterthe8thSCLclockpulse
oftheaddressframeandbeforethecompletionofa
Table 2. Address Assignment
AD1
AD0
ADDRESS
LOW
0001000
LOW
Float
0001001
LOW
HIGH
0001010
Float
HIGH
0001011
Float
0011000
Float
LOW
0011001
HIGH
LOW
0011010
HIGH
Float
0011011
HIGH
0101000
1
2
A6
SDA
START BY
MASTER
ACK BY
ADC
ACK BY
ADC
CONVERSION
INITIATED
STOP BY
MASTER
SCL
A5
A4
A3
A2
A1
A0 R/W
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
2309 F08b
S/D O/S
WRITE 1 BYTE
S1
S0
UNI
DIN WORD
SLP
X
ADDRESS FRAME
Figure 8b. Timing Diagram for Writing to the LTC2309
AppLICAtIOns InFORMAtIOn
read/writeoperationwillalsoinitiatenewconversion,
buttheoutputresultmaynotbevalidduetolackof
adequateacquisitiontime(seeAcquisitionsection).
LTC2309 Address
TheLTC2309hastwoaddresspins(AD0andAD1)that
maybetiedHIGH,LOW,orleftfloatingtoenableone
of9possibleaddresses(seeTable2).
In addition to the configurable addresses listed in
Table2,theLTC2309alsocontainsaglobaladdress
(1101011)whichmaybeusedforsynchronizingmul-
tipleLTC2309sorotherI2CLTC230XSARADCs(see
SynchronizingMultipleLTC2309swithGlobalAddress
Callsection).
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