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AD7709BRU Arkusz danych(PDF) 6 Page - Analog Devices

Numer części AD7709BRU
Szczegółowy opis  16-Bit Sigma Delta ADC with Current Sources, Switchable Reference Inputs and I/O Port
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Strona internetowa  http://www.analog.com
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AD7709
–6–
REV. PrA
January 2001
PRELIMINARY TECHNICAL DATA
TIMINGCHARACTERISTICS1,2 (V
DD = +3V ±10% or VDD = +5V ±10%;GND = 0 V:XTAL = 32.768kHz; Input Logic 0 = 0 V, Logic 1 = VDD
unlessotherwisenoted)
Limit at TMIN, TMAX
Parameter
(B Version)
Units
Conditions/Comments
t1
32.768
kHz typ
Crystal Oscillator Frequency.
t2
50
ns min
RESET Pulse Width
Read Operation
t3
0
ns min
RDY to CS Setup Time
t4
0
ns min
CS Falling Edge to SCLK Active Edge Setup
Time
3
t5
4
0
ns min
SCLK Active Edge to Data Valid Delay
3
60
ns max
VDD = +4.5 V to +5.5 V
80
ns max
VDD = +2.7 V to +3.6 V
t5A
4,5
0
ns min
CS Falling Edge to Data Valid Delay3
60
ns max
VDD = +4.5 V to +5.5 V
80
ns max
VDD = +2.7 V to +3.6 V
t6
100
ns min
SCLK High Pulse Width
t7
100
ns min
SCLK Low Pulse Width
t8
0
ns min
CS Rising Edge to SCLK Inactive Edge Hold
Time
3
t9
6
10
ns min
Bus Relinquish Time after SCLK Inactive Edge
3
80
ns max
t10
100
ns max
SCLK Active Edge to
RDY High3, 7
Write Operation
t11
0
ns min
CS Falling Edge to SCLK Active Edge Setup
Time
3
t12
30
ns min
Data Valid to SCLK Edge Setup Time
t13
25
ns min
Data Valid to SCLK Edge Hold Time
t14
100
ns min
SCLK High Pulse Width
t15
100
ns min
SCLK Low Pulse Width
t16
0
ns min
CS Rising Edge to SCLK Edge Hold Time
NOTES
1 Sampletestedduringinitialreleasetoensurecompliance.Allinputsignalsarespecifiedwithtr=tf=5ns(10%to90%ofV
DD)andtimedfromavoltagelevelof1.6V.
2 SeeFigures1and2.
3 SCLKactiveedgeisfallingedgeofSCLK.
4 ThesenumbersaremeasuredwiththeloadcircuitofFigure3anddefinedasthetimerequiredfortheoutputtocrosstheV
OL orVOHlimits.
5 Thisspecificationonlycomesintoplayif
CSgoeslowwhileSCLKislow.ItisrequiredprimarilyforinterfacingtoDSPmachines.
6 Thesenumbersarederivedfromthemeasuredtimetakenbythedataoutputtochange0.5 VwhenloadedwiththecircuitofFigure3.Themeasurednumberisthenextrapolatedbacktoremoveeffectsofchargingor
dischargingthe50pFcapacitor.Thismeansthatthetimesquotedinthetimingcharacteristicsarethetruebusrelinquishtimesofthepartandassuchareindependentofexternalbusloadingcapacitances.
7
RDYreturnshighafterthefirstreadfromthedeviceafteranoutputupdate.Thesamedatacanbereadagain,ifrequired,whileRDYishigh,althoughcareshouldbetakenthatsubsequentreadsdonotoccurcloseto
thenextoutputupdate.


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