Texas Instruments ADS8678 Handleiding
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-0.05
-0.03
-0.01
0.01
0.03
0.05
±40 ±7
265992125
Gain (% FS)
Free-Air Temperature (
o
C)
C039
---- ± 2.5*V
REF,
---- 1.25*V
REF
---- 0.625*V
REF,
------0.3125*V
REF
-------0.156 V
REF,
---- + 2.5*V
REF
---- + 1.25*V
REF,
---- + 0.625*V
REF
---- + 0.3125*V
REF
Multiplexer
Oscillator
CS
SCLK
SDI
SDO
DAISY
REFSEL
RST/PD
REFCAP
REFIO
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
V
B0
AIN_0P
AIN_0GND
OVP
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
V
B1
AIN_1P
AIN_1GND
OVP
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
V
B2
AIN_2P
AIN_2GND
OVP
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
V
B3
AIN_3P
AIN_3GND
OVP
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
V
B4
AIN_4P
AIN_4GND
OVP
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
V
B5
AIN_5P
AIN_5GND
OVP
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
V
B6
AIN_6P
AIN_6GND
OVP
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
V
B7
AIN_7P
AIN_7GND
OVP
AUX_IN
AUX_GND
14-Bit
SAR ADC
Digital
Logic
and
Interface
4.096-V
Reference
REFGND
DGNDAGND
DVDD
AVDD
Additional Channels in ADS8678
ADS8678
ADS8674
ALARM
Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
Reference
Design
ADS8674
,
ADS8678
SBAS627–JULY2015
ADS867x14-Bit,500-kSPS,4-and8-Channel,Single-Supply,SARADCswith
BipolarInputRanges
1Features2Applications
1
•14-BitADCswithIntegratedAnalogFront-End
•PowerAutomation
•4-,8-ChannelMUXwithAutoandManualScan•ProtectionRelays
•Channel-IndependentProgrammableInputs:•PLCAnalogInputModules
–±10.24V,±5.12V,±2.56V,±1.28V,±0.64V
3Description
–10.24V,5.12V,2.56V,1.28V
TheADS8674andADS8678are4-and8-channel,
•5-VAnalogSupply:1.65-Vto5-VI/OSupply
integrateddataacquisitionsystemsbasedona14-bit
•ConstantResistiveInputImpedance:1MΩ
successiveapproximation(SAR)analog-to-digital
converter(ADC),operatingatathroughputof
•InputOvervoltageProtection:Upto±20V
500kSPS.Thedevicesfeatureintegratedanalog
•On-Chip,4.096-VReferencewithLowDrift
front-endcircuitryforeachinputchannelwith
•ExcellentPerformance:
overvoltageprotectionupto±20V,a4-or8-channel
multiplexerwithautomaticandmanualscanning
–500-kSPSAggregateThroughput
modes,andanon-chip,4.096-Vreferencewithlow
–DNL:±0.2LSB;INL:±0.25LSB
temperaturedrift.Operatingonasingle5-Vanalog
–LowDriftforGainErrorandOffset
supply,eachinputchannelonthedevicescan
–SNR:85dB;THD:–100dB
supporttruebipolarinputrangesof±10.24V,
±5.12V,±2.56V,±1.28Vand±0.64V,aswellas
–LowPower:65mW
unipolarinputrangesof0Vto10.24V,0Vto5.12V,
•AUXInput→DirectConnectiontoADCInputs
0Vto2.56Vand0Vto1.28V.Thegainofthe
•ALARM→HighandLowThresholdsperChannel
analogfront-endforallinputrangesisaccurately
trimmedtoensureahighdcprecision.Theinput
•SPI™-CompatibleInterfacewithDaisy-Chain
rangeselectionissoftware-programmableand
•IndustrialTemperatureRange:–40°Cto125°C
independentforeachchannel.Thedevicesoffera
•TSSOP-38Package(9.7mm×4.4mm)
1-MΩconstantresistiveinputimpedanceirrespective
oftheselectedinputrange.
BlockDiagram
TheADS8674andADS8678offerasimpleSPI-
compatibleserialinterfacetothedigitalhostandalso
supportdaisy-chainingofmultipledevices.Thedigital
supplyoperatesfrom1.65Vto5.25V,enabling
directinterfacetoawiderangeofhostcontrollers.
DeviceInformation
(1)
PARTNUMBERPACKAGEBODYSIZE(NOM)
ADS867xTSSOP(38)9.70mm×4.40mm
(1)Forallavailablepackages,seetheorderableaddendumat
theendofthedatasheet.
GainErrorversusTemperature
1
AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,
intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.
ADS8674
,
ADS8678
SBAS627–JULY2015
www.ti.com
TableofContents
8.4DeviceFunctionalModes........................................36
1Features..................................................................1
8.5RegisterMaps.........................................................49
2Applications...........................................................1
9ApplicationandImplementation........................65
3Description.............................................................1
9.1ApplicationInformation............................................65
4RevisionHistory.....................................................2
9.2TypicalApplications................................................65
5DeviceComparisonTable.....................................3
10Power-SupplyRecommendations.....................68
6PinConfigurationandFunctions.........................3
11Layout...................................................................69
7Specifications.........................................................5
11.1LayoutGuidelines.................................................69
7.1AbsoluteMaximumRatings......................................5
11.2LayoutExample....................................................70
7.2ESDRatings..............................................................5
12DeviceandDocumentationSupport.................71
7.3RecommendedOperatingConditions.......................5
12.1DocumentationSupport........................................71
7.4ThermalInformation..................................................5
12.2RelatedLinks........................................................71
7.5ElectricalCharacteristics...........................................6
12.3CommunityResources..........................................71
7.6TimingRequirements:SerialInterface....................10
12.4Trademarks...........................................................71
7.7TypicalCharacteristics............................................11
12.5ElectrostaticDischargeCaution............................71
8DetailedDescription............................................22
12.6Glossary................................................................71
8.1Overview.................................................................22
13Mechanical,Packaging,andOrderable
8.2FunctionalBlockDiagram.......................................22
Information...........................................................72
8.3FeatureDescription.................................................23
4RevisionHistory
DATEREVISIONNOTES
July2014*Initialrelease.
2SubmitDocumentationFeedbackCopyright©2015,TexasInstrumentsIncorporated
ProductFolderLinks:ADS8674ADS8678
1
2
3
4
5
6
7
8
30
29
28
27
26
25
24
CS
SCLK
SDO
ALARM
DVDD
DGND
AGND
AGND
SDI
RST/PD
DAISY
REFSEL
REFIO
REFGND
REFCAP
22
21
20
AVDD
AGND
AGND
AIN_5P
AIN_5GND
AIN_4P
AIN_4GND
9AVDD
AUX_IN
AUX_GND
AIN_6P
AIN_6GND
AIN_7P
AIN_7GND
10
11
12
13
14
15
23
AIN_3P
AIN_3GND
AIN_2P
AIN2_GND
AIN_0P
AIN_0GND
AIN_1P
AIN_1GND
16
17
18
19
31
32
33
34
35
36
37
38
AGND
ADS8678
1
2
3
4
5
6
7
8
30
29
28
27
26
25
24
CS
SCLK
SDO
ALARM
DVDD
DGND
AGND
AGND
SDI
RST/PD
DAISY
REFSEL
REFIO
REFGND
REFCAP
22
21
20
AVDD
AGND
AGND
NC
NC
NC
NC
9AVDD
AUX_IN
AUX_GND
NC
NC
NC
NC
10
11
12
13
14
15
23
AIN_3P
AIN_3GND
AIN_2P
AIN2_GND
AIN_0P
AIN_0GND
AIN_1P
AIN_1GND
16
17
18
19
31
32
33
34
35
36
37
38
AGND
ADS8674
ADS8674
,
ADS8678
www.ti.com
SBAS627–JULY2015
5DeviceComparisonTable
PRODUCTRESOLUTION(Bits)CHANNELSSAMPLERATE(kSPS)
ADS8674144,single-ended500
ADS8678148,single-ended500
6PinConfigurationandFunctions
DBTPackage
38-PinTSSOP
TopView(NottoScale)
PinFunctions
PIN
NAMEI/ODESCRIPTION
NO.
ADS8674ADS8678
1SDIDigitalinputDatainputforserialcommunication.
Activelowlogicinput.
2RST/PDDigitalinput
Dualfunctionalitytoresetorpower-downthedevice.
3DAISYDigitalinputChainthedatainputduringserialcommunicationindaisy-chainmode.
Activelowlogicinputtoenabletheinternalreference.
Whenlow,theinternalreferenceisenabled;
4REFSELDigitalinputREFIObecomesanoutputthatincludestheV
REF
voltage.
Whenhigh,theinternalreferenceisdisabled;
REFIObecomesaninputtoapplytheexternalV
REF
voltage.
5REFIOAnaloginput,outputInternalreferenceoutputandexternalreferenceinputpin.DecouplewithREFGNDonpin6.
ReferenceGNDpin;shorttotheanalogGNDplane.
6REFGNDPowersupply
DecouplewithREFIOonpin5andREFCAPonpin7.
7REFCAPAnalogoutputADCreferencedecouplingcapacitorpin.DecouplewithREFGNDonpin6.
8AGNDPowersupplyAnaloggroundpin.DecouplewithAVDDonpin9.
9AVDDPowersupplyAnalogsupplypin.DecouplewithAGNDonpin8.
10AUX_INAnaloginputAuxiliaryinputchannel:positiveinput.DecouplewithAUX_GNDonpin11.
11AUX_GNDAnaloginputAuxiliaryinputchannel:negativeinput.DecouplewithAUX_INonpin10.
Copyright©2015,TexasInstrumentsIncorporatedSubmitDocumentationFeedback3
ProductFolderLinks:ADS8674ADS8678
Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | ADS8678 |
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