datasheet 0809 tieng viet

8/7/2019 Datasheet 0809 Tieng Viet

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ADC0808/ADC08098-Bit P Compatible A/D Converters with 8-ChannelMultiplexerGeneral DescriptionHp thnh thu d liu ADC0808, ADC0809 l mt thit b CMOS vng chc vi b

chuyn i 8-bit analog-to-digital, ba cng 8-knh v b vi x l tng thch iukhin logic. B chuyn i 8-bit A/D s dng php tnh xp xlin tc theo k thut qub chuyn i. B chuyn i nhiu tnh nng ngt in tr khng cao lm n nhb so snh, b chia in p 256R vi chuyn mch analog hnh cy v thanh ghi phptnh xp xlin tc. Ba cng 8-knh c th trc tip truy cp bt c cc tn hiuanalog 8-single-ended no.

Thit b loi b s cn thit ca t im gia (zero) bn ngoi v nhng iu chnh ging kch thc thc s (full-scale). D lp ghp vi cc b vi x l c cung cp bic gi cht v c gii m cc a chba cng cc u vo v cc u ra TTLTRI-STATE bng cht.

S thit k ca ADC0808, ADC0809 c ti u nh kt hp cht ch nhng dinmo mong mun nht ca vi k thut chuyn i A/D. ADC0808, ADC0809 cho ra tc cao, chnh xc cao, s ph thuc nhit ti thiu, mc chnh xc lu di (long-term) v c th lp li tuyt ho, v tiu th nng lng ti thiu. Nhng tnh nng lm cho thit b ph hp mt cch l tng vi cc ng dng qu trnh v my kimsot tiu dng v cc ng dng tng.i vi ba cng 16-knh c u ra chung(sample/hold port) th c bng d liu ADC0816. (See AN-247 for more information.)

Cc tnh nng

D ghp ni vi tt c cc b vi x lHot ng ratio-metrically hoc vi 5 VDC hoc m rng tng tin p

iu chnhKhng i hi hiu chnh im gia hoc full-scale (ging kch thc thcs)8-channel ba cng c cc a chlogicDi vo 0V ti 5V vi b cung cp nng lng n l 5VCc u vo tho mn in p mc chnh TTL kn tiu chun hoc kiu bao gi 28-pin DIPBao gi chuyn ch chip kiu c 28-pinADC0808 tng ng vi MM74C949ADC0809 tng ng vi MM74C949-1

Nhng c tnh ch cht

phn gii 8 BitsTng s li khng hiu chnh 12 LSB v 1 LSBNgun cung cp n l 5 VDCNng lng thp 15 mWThi gian chuyn i 100 s


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Thng tin t hng

TEMPERATURERANGE

40C to +85C55C to+125C

Error12 LSB ADC0808CCN ADC0808CCV ADC0808CCJ ADC0808CJ


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Khngiuchnh1 LSBKhngiuchnh

ADC0809CCN ADC0809CCV

Package OutlineN28A MoldedDIP

V28A MoldedChip Carrier

J28A CeramicDIP

J28ACeramicDIP

Nhng loi cc cao (Notes 2, 1)Nu nhng thit b ch r theo yu cu ca qun s/khng gian v tr, xin lin hvi National Semiconductor Sales Office/Distributors mua v chi tit vcim k thut.Supply Voltage (VCC) (Note 3) 6.5VVoltage at Any Pin 0.3V to (VCC+0.3V)Except Control Inputs Voltage at Control Inputs 0.3V to +15V(START, OE, CLOCK, ALE, ADD A, ADD B, ADD C)Storage Temperature Range 65C to +150CPackage Dissipation at TA=25C 875 mWLead Temp. (Soldering, 10 seconds) Dual-In-Line Package (plastic) 260CDual-In-Line Package (ceramic) 300CMolded Chip Carrier Package Vapor Phase (60 seconds) 215CInfrared (15 seconds) 220CESD Susceptibility (Note 8) 400V

Cc iu khin hot ng (Notes 1, 2)Temperature Range (Note 1) TMINTATMAX

ADC0808CCN,ADC0809CCN 40CTA+85C

ADC0808CCV, ADC0809CCV 40C TA +85CRange of VCC (Note 1) 4.5 VDC to 6.0VDC

Cc c tnh inNhng c im k thut ca b chuyn i: VCC=5 VDC=VREF+, VREF()=GND,TMINTATMAX and fCLK=640 kHz unless otherwise stated.

K hiu Tham sCc iu

kinMin Typ Max

Cc nv

ADC0808

TotalUnadjustedError(Note 5)

25C

TMIN toTMAX

12

34

LSB

LSB


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ADC0809TotalUnadjustedError(Note 5)

0C to 70CTMIN toTMAX

1114

LSBLSB

Input

Resistance

From Ref(+)

to Ref() 1.0 2.5 kWAnalog InputVoltageRange

(Note 4)V(+) or V()

GND0.10 VCC+0.10 VDC

VREF(+)Voltage, Topof Ladder

Measuredat Ref(+)

VCC VCC+0.1 V

Voltage,Center ofLadder

VCC/2-0.1 VCC/2 VCC/2+0.1 V

VREF()Voltage,Bottom ofLadder

Measuredat Ref()

0.1 0 V

IIN

ComparatorInput Current

fc =640kHz, (Note6)

2 0.5 2 A

Cc c tnh vinCc mc Digital v nhng c im k thut DC: ADC0808CCN, ADC0808CCV,ADC0809CCN and ADC0809CCV, 4.75VCC5.25V,

40CTA+85C khng k nhng ch khc

Symbol Parameter Conditions Min Typ Max UnitsANALOG MULTIPLEXER

IOFF(+)OFF ChannelLeakage Current

VCC =5V, VIN=5V,TA =25CTMIN to MAX

10 2001.0

nAA

IOFF()OFF ChannelLeakage Current

VCC =5V, IN=0,TA =25CTMIN to MAX

2001.0

10 nAA

CONTROL INPUTS

VIN(1)Logical 1 InputVoltage VCC1.5 V

VIN(0)Logical 0 InputVoltage

1.5 V

IIN(1)Logical 1 InputCurrent

VIN =15V 1.0 A

(The ControlInputs)

IIN(0) Logical 0 Input VIN =0 1.0 A


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Current

(The ControlInputs)

ICC Supply Current fCLK =640 kHz 0.3 3.0 mA

Cc mc Digital v nhng c im k thut DC: ADC0808CCN, ADC0808CCV,ADC0809CCN and ADC0809CCV, 4.75VCC5.25V,

40CTA+85C khng k nhng ch khc

Symbol Parameter Conditions Min Typ Max UnitsDATA OUTPUTS AND EOC (INTERRUPT)

VOUT(1)Logical 1 OutputVoltage

VCC = 4.75VIOUT = 360AIOUT = 10A

2.44.5

V(min)V(min)

VOUT(0)Logical 0 OutputVoltage

IO =1.6 mA 0.45 V

VOUT(0)Logical 0 Output

Voltage EOC

IO =1.2 mA 0.45 V

IOUTTRI-STATEOutput Current

VO =5VVO =0

33

AA

Nhng c im k thut inLa chn nhng c im k thut VCC=VREF(+)=5V, VREF()=GND, tr=tf=20 nsand TA=25C khng k nhng ch khc.

Symbol Parameter Conditions MIn Typ Max Units

tWSMinimum StartPulse Width

(Figure 5) 100 200 ns

tWALE

Minimum ALE

Pulse Width

(Figure 5) 100 200 ns

TsMinimum AddressSet-Up Time

(Figure 5) 25 50 ns

tH

Minimum AddressHold Time

(Figure 5) 25 50 ns

tDAnalog MUXDelay Time

RS =0W (Figure 5) 1 2.5 s

From ALE

tH1,tH0OE Control to QLogic State

CL =50 pF, RL=10k (Figure 8)

125 250 ns

T1H,t0H

OE Control to Hi-Z

CL =10 pF, RL=10k (Figure 8)

125 250 ns

tcConversion Time fc =640 kHz,

(Figure 5) (Note 7)90 100 116 s

fc Clock Frequency 10 640 1280 kHz

tEOC EOC Delay Time (Figure 5) 08+2S

Clock

Periods

CINInputCapacitance

At Control Inputs 10 15 pF


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COUT

TRI-STATEOutput

At TRI-STATEOutputs

10 15 pF

Note 1: Cc t l cc i tuyt i cho bit cc n sau cc gii hn c th xuthin se do cho thit b. Nhng c im k thut in DC v AC khng pdng khi thit b hot ng pha sau cc iu kin chr ca n.

Note 2: Tt c cc in p c o vi s ch ti GND, khng k nhng ch khc.Note 3: C diode zenerang tn ti, bn trong, t VCC n GND v c snhthng in hnh in p chng 7 VDC.Note 4: Hai diode on-chip rng buc tng u vo tng t m n s hngtip ti i vi cc in p u vo analog mt diode h thp hn t hoc mtdiode cao hn ngun cung cp VCCn mt cht. Cho php d 100 mV tip ti dc ca c hai diode.iu ny c ngha l VIN ko di khng c tri hn inp ngun cung cp nhiu hn 100 mV, th m u ra s chnh xc.t cdi in p u ra tuyt i t 0VDC n 5VDC s v th yu cu in p nguncung cp ti thiu chng 4.900 VDC bn trn cc bin nhit , dung sai banu v np ti.

Note 5: Tng s li khng iu chnh bao gm offset, full-scale, linearity, v ccli multiplexer. Xem Hnh 3. Khng c trong s nhng yu cu A/D hiu chnhzero hoc full-scale. Tuy nhin, nu tt c m zero code c mong mun chou vo analog khc hn 0.0V, hoc nu tn ti khong cch full-scale hp (vd: 0.5V n 4.5V full-scale) cc in p tham chiu c thc hiu chnh t iu ny. Xem Hnh 13.Note 6: B so snhdng in u vo thin v dng in i vo hoc ra camy so mu n nh ngt. Xu hng dng in bin i trc tip vi tn sngh v tu thuc mt cht vo nhit (Hnh 6). Xem on 4.0.Note 7: Cc u ra ca thanh ghi d kin c cp nht mt chu kng htrc pha ang tng ca EOC.Note 8: Kiu thn ngi, phng in 100 pF thng qua in tr 1.5 k .

Phn m t chc nng (trang 5 bn ting Anh)Ba cng. Thit b cha ba cng tn hiu analog u cui n 8-knh. Mt knhu vo c bit c la nh s dng b gii m a ch. Bng 1 trnh by cc trngthi ca cc dng a ch la bt c knh no. Cc a chc gi (latched) votrong b gii m trn chuyn tip thp-ti-cao ca tn hiu a chc th gi.

BNG 1.

DNG A CHKNH ANALOGC LA C B A

IN0 L L L

IN1 L L H

IN2 L H L

IN3 L H H

IN4 H L L


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IN5 H L H

IN6 H H L

IN7 H H H

CC C IM CA B CHUYN IS chuyn i

Tri tin ca h thng thu d liu kiu chip n ny l b chuyn i analog-thnh-digital8-bit ca n. B chuyn i c thit k cho nhanh, chnh xc, v c th lp lainhiu chuyn i trn phm vi rng ca nhit . B chuyn i c phn thnh 3phn chnh: mng bc thang 256R, thanh ghi php tnh xp xlin tc, v b so snh.Cc u ra k thut s ca b chuyn i l ng tuyt i.

Phng php mng bc thang 256R (Hnh 1) c chn trn bc thang thngR/2R v tnh cng n sc (mono-tonicity) ca n, iu bo m khng mt cc mdigital. Tnh cng n sc l c bit quan trng trong vng lp kn nhng h thng

iu khin phn hi. Quan h khng c tnh cng n sc c th l l do nhng daong m n s l thm khc (catastrophic) i vi h thng. Ngoi ra, mng 256R khng l l do np bin trn in p tham chiu.

Nt nhn in try v in trnh ca mng bc thang trong Hnh 1 l khngcng gi tr nh ch cn li ca mng. S khc nhau trong nhng in tr ny nguyndo c tnh u ra cn xng vi nhng im zero v full-scale ca ng congchuyn giao. S chuyn tip u ra u tin xut hin khi tn hiu analog t n +12LSB v nhng chuyn tip u ra tip theo xut hin c 1 LSB mun hn ln dn full-scale.

Thanh ghi php tnh xp xlin tc (SAR) thc hin 8 lp i lp li n xp xin p

vo.i vi bt c kiu chuyn i SAR no, n-lp li l c yu cu i vi chuyni n-bit. Hnh 2 trnh by v d tiu bit ca b chuyn i 3-bit. Trong ADC0808,ADC0809, k thut php tnh xp xl tu thuc vo 8 bit s dng mng 256R.

Thanh ghi php tnh xp xi lin tc ca b chuyn i A/D (SAR) th t li trn cnhdng ca xung bt u chuyn i (SC). S chuyn i bt u trn cnh di xungca xung bt u chuyn i. S chuyn i theo qu trnh s b gin on do nhnc xung bt u chuyn i mi. S chuyn i lin tc c thc hon thnh dolin kt end-of-conversion(EOC) u ra vi SC u vo. Nu thng dng trong chny, xung chuyn i bt u bn trong nn c p dng sau khi tng nng lng.End-of-conversions xung thp gia 0 v 8 nhp ng h sau cnh tng ln ca btu chuyn i. Phn quan trng nht ca b chuyn i A/D l b so snh. Thc ra

phn ny chu trch nhim i vi nn tng chnh xc ca ton b s chuyn i. Ncn l b so snh lch (drift) c nh hng ln n nng lc lp li ca thit b. Bso snh n nh ngt (chopper-stabilized) cung cp phng php hiu qu nht v thomn tt c nhu cu chuyn i.

B so snh n nh ngt chuyn i tn hiu u vo DC thnh tn hiu AC. Tn hiu nysau cung cp (fed) qua b khuch i AC cao hn v c mc DC c phc hi. Kthut ny gii hn s sai lch thnh phn ca b khuch i bi s sai lch l thnhphn DC m khng c truyn nh b khuch i AC.iu ny lm cho ton b b


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chuyn i A/D cc k nhy cm vi nhit , lch lu di v tn hiu u vo in ranhiu li. Hnh 4 trnh by ng cong li tiu biu i vi ADC0808 khi c o bngcch dng cc th tc c tho ra trong AN-179.


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Thng tin cc ng dng (trang 8 bn ting Anh)

THAO TC

1.0 CHUYN I S TRUYN H METADC0808, ADC0809 c thit k nh mt h thng thu d liu hon chnh (DAS) ivi h thng chuyn i h mt (Data Acquisition System (DAS)). Trong cc h thngh met, s bin i vt l c cn nhc (measured) biu din theo t l phn trm cakch thc c bo ton m n khng nht thit lin quan vi tiu chun tuyt i.in p tn hiu vo trong ADC0808 c biu din bng phng trnh

=VzVfs

Vin

minmax DD

Dx

(1)

VIN=in p nhp vo bn trong ADC0808Vfs=in p c bo ton


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VZ=in p ZeroDX=in d kin ang oDMAX=Gii hn cc i ca d kinDMIN=Gii hn cc tiu ca d kin

V d tt ca my bin nng (transducer) t s truyn met l ci phn th

(potentiometer) thng dng nh mt cm bin v tr. V tr ca wiperl i xng thngvi in p ra m n t l vi in p c bo ton qua n. V rng d kin c trnhby nh t l ca full-scale, nhiu yu cu tham chiu c gim ln, loi tr ngun liln v chi ph i vi nhiu ng dng. Thun li chnh ca ADC0808, DC0809 lphm vi in p u vo bng pham vi ngun cung cp v vy my bin nng c thc kt ni trc tip qua ngun cung cp v cc u ra ca n kt ni trc tip vocc u vo ba cng, (Hnh 9).

My bin nng t truyn met nh ci phn th, my o sc cng, b cu nhit nhm,my bin nng kiu p lc, v..., l ph hp o cc quan h cn xng; tuy nhin,nhiu kiu php o cn phi quy vo chun tuyt i nhin p v dng in.iuny c ngha l h thng tham chiu cn c s dng lin quan ti in p full-scale

vi volt chun. V d, nu VCC=VREF=5.12V, th di full-scale c chia thnh 256 bctiu chun. Bc tiu chun nh nht l 1 LSB m n cng l 20 mV.

2.0 NHNG NHC IM CA IN TR BC THANGin p tin tr bc thang th c so snh la 8 ln trong chuyn i. Cc inp cp i vi my so mu (comparator) theo ng kho chuyn analog hnh cym n tham chiu ti ngun cung cp.in p nh, tm, v y ca thang cnphi c kim sot duy tr s hot ng chnh xc.

ADC0808 cn thit (tiu th) t hn mt milliamp ngun hin hnh, v vy s khai thccung cp t tham chiu l d dng hon thnh. Trong Hnh 11 h thng tham chiuc nhm li c trnh by dng in pht sinh t tham chiu . Bm trnh byc th ln n amp iu khin cung cp milliamp ca ngun hin hnh v bus iukhin mong mun, hoc nu bus in dung c iu khin bi tn hiu u ra l tin ln s cung cp dng in nh trng thy trong Hnh 12. LM301 l b trn bo m n nh khi np ti nh tu ra 10 F.

Cc in p nh v y thang khng c tri hn VCC v t (vi y), nhng chngc th l t i xng hn VCC v ln hn t.in p thn ca thang cn lun lun lgn tm ca ngun cung cp. nhy cua b chuyn i c thc tng ln, (ngha


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l, kch thc ca cc bc LSB gim) nh s dng h thng tham chiu i xng.Trong Hnh 13, a 2.5V tham chiu i xng canh gia khong VCC/2 bi v cng dngin chy trong cc in tr y ht nhau. H thng ny vi 2.5V tham chiu cho php bitLSB ti mt na kch thc ca h thng tham chiu 5V.

nh ca thang, Ref(+), cn khng dng hn ngun cung cp, v y ca thang,

Ref(), cn khng m hn t.in p tm thang cng cn gn tm ca ngun cungcp v rng kho chuyn analog hnh cy t N-knh chuyn thnh kho chuyn P-knh.Nhng thiu st l tng tho mn trong nhng h thng t s met v c th ddng gp trong cc h thng c tham kho vi t.

Hnh 10 trnh by h thng tham kho vi t c s phn cch ngun cung cp v thamchiu. Trong h thng ny, ngun cung cp cn phi sp xp so khp in p thamchiu. V d, nu 5.12V c s dng, th ngun cung cp cn c hiu chnh ncng in p bn trong 0.1V.

Cc in p nh v y ca thang khng th tri hn VCC v t, nhng chng c th tcn xng hn VCC v cao hn t.in p tm ca thang nn lun lun gn tm ca

ngun cung cp. S nhy cm ca b chuyn i c th tng, (ngha l., kch thc cacc bc LSB c gim) do cch dng h thng tham chiu cn xng. Trong Hnh 13,a 2.5V tham chiu mt cch i xng xuyn tm khong VCC/2 bi v cng dng inchy trong cc in tr ging ht nhau. H thng ny vi 2.5V tham chiu cho php bitLSB thnh mt na kch thc ca h thng tham chiu 5V.


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3.0 CC PHNG TRNH CHUYN ISh chuyn tip gia cc m lin k N v N+1 c cho bi:

Tm ca m u ra N cho bi:

M u ra N i vi u vo bt k l s nguyn bn trong dy:

y: VIN=in p u vo b so snh


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VREF(+)=Voltage at Ref(+)VREF()=Voltage at Ref()VTUE=Tng s li in p khng iu chnh (tiu biu VREF(+)512)

4.0 B SO SNH ANALOG CC U VOS sai lc in dung bn trong chip ca kho chuyn theo chu k l l do so mu ng

dng in u vo. Nhng kt ni xen k vo u ra ca in tr bc thang/mngkho chuyn hnh cy v vi b so snh u ra nh mt phn ca hot ng ca b sosnh n nh kiu ngt in.

Gi tr trung bnh ca b so snh dng in u vo bin i trc tip vi tn sngh v vi VIN nh trnh by trn Hnh 6.

Nu cc tin lc c s dng ti cc u vo analog v tr khng ngun tn hiuthp, th b so snh dng in u vo c th khng sn sinh li chuyn i, nh nhtthi to ra do phng in in dung s tt ngm (die out) trc khi b so snh u ranhp nhy.

Nu cc tin lc u vo c mong gim tp nhiu v tn hiu iu kin chngs c xu hng ti trung bnh ngoi so snh ng dng in u ra. Nm vng nhngc im ca th hiu dch DC hin hnh ca hiu ng c th don trc theo thithng.


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LIFE SUPPORT POLICYNATIONALS PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICALCOMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE


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EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSELOF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or systems which, (a) are intended forsurgical implantinto the body, or (b) support or sustain life, and whose failure to perform when properly

used in accordance with instructions for use provided in the labeling, can be reasonablyexpected to result in a significant injury to the user.

2. A critical component is any component of a life support device or system whosefailure to perform can be reasonably expected to cause the failure of the life supportdevice or system, or to affect its safety or effectiveness.

datasheet 0809 tieng viet

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