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参数资料
| 型号： | LTC2309IF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 24/26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
pIn FunCtIOns
CH3-CH7 (Pins 1-5):Channel3toChannel7Analog
Inputs.CH3-CH7canbeconfiguredassingle-ended
or differential input channels. See the Analog Input
Multiplexersection.
COM (Pin 6): Common Input. This is the reference
point for all single-ended inputs. It must be free of
noiseandshouldbeconnectedtogroundforunipolar
conversionsandmidwaybetweenGNDandREFCOMP
forbipolarconversions.
VREF (Pin 7):2.5VReferenceOutput.BypasstoGND
withaminimum2.2Fceramiccapacitor.Theinternal
referencemaybeoverdrivenbyanexternal2.5Vrefer-
enceatthispin.
REFCOMP (Pin 8):ReferenceBufferOutput.Bypass
to GND with 10F and 0.1F ceramic capacitors in
parallel.Nominaloutputvoltageis4.096V.Theinternal
referencebufferdrivingthispinisdisabledbyground-
ingVREF,allowingREFCOMPtobeoverdrivenbyan
externalsource.
GND (Pins 9-11, 18-20):Ground.AllGNDpinsmust
beconnectedtoasolidgroundplane.
VDD (Pins 12, 13, 21):5VSupply.TherangeofVDDis
4.75Vto5.25V.BypassVDDtoGNDwitha10Fceramic
capacitorinparallelwiththree0.1Fceramiccapacitors,
onelocatedascloseaspossibletoeachpin.
AD0 (Pin 14):ChipAddressControlPin.Thispinis
configuredasathree-state(LOW,HIGH,floating)ad-
dresscontrolbitforthedeviceI2Caddress.SeeTable2
foraddressselection.
AD1 (Pin 15):ChipAddressControlPin.Thispinis
configured as a three-state (LOW, HIGH, floating)
address control bit for the device I2C address. See
Table2foraddressselection.
SCL (Pin 16):SerialClockPinoftheI2CInterface.The
LTC2309canonlyactasaslaveandtheSCLpinonly
acceptsanexternalserialclock.Dataisshiftedinto
theSDApinontherisingedgesoftheSCLclockand
outputthroughtheSDApinonthefallingedgesofthe
SCLclock.
SDA (Pin 17):BidirectionalSerialDataLineoftheI2C
Interface.Intransmittermode(read),theconversion
resultisoutputattheSDApin,whileinreceivermode
(write),theDINwordisinputattheSDApintocon-
figuretheADC.Thepinishighimpedanceduringthe
datainputmodeandisanopen-drainoutput(requires
anappropriatepull-updevicetoVDD)duringthedata
outputmode.
CH0-CH2 (Pins 22-24):Channel0toChannel2Analog
Inputs.CH0-CH2canbeconfiguredassingle-ended
or differential input channels. See the Analog Input
Multiplexersection.
Exposed Pad (Pin 25): Ground. Must be soldered
directlytogroundplane.
(QFN)
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