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PINASSIGNMENTS
REF
R
COM
R1
R
OFS
R
FB
I
输出
AGND
LDAC
WR
D15
D14
D13
D12
D11
RST
D0
D1
D2
D3
V
DD
DGND
D4
D5
D6
D7
D8
D9
D10
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
DAC8820
DAC8820
SBAS358A–AUGUST2005–REVISEDNOVEMBER2005
electricalcharacteristics(持续)
Allspecificationsat–40
°
cto+85°c,v
DD
=+2.7vto+5.5v,i
输出
=virtualgnd,地=0v,v
REF
=10v,andt
一个
=full
operatingtemperature,unlessotherwisenoted.
DAC8820
PARAMETERCONDITIONSMINTYPMAXUNITS
ACCHARACTERISTICS
outputcurrentsettlingtime0.5
µ
s
ReferencemultiplyingBWV
REF
=5V
PP
,数据=ffffh10mhz
V
REF
=0vto10v,
DACglitchimpulse2nV–s
Data=7FFFhto8000hto7FFFh
FeedthrougherrorV
输出
/v
REF
数据=0000h,v
REF
=100kHz–70dB
Digitalfeedthrough2nV–s
Totalharmonicdistortion–105dB
outputspotnoisevoltage12nv/
√
Hz
PIN#NAMEDESCRIPTION
centertapoftwo4-quadrantresistors
2R
COM
(r1andr2).
3r14-quadrantresistor(r1).
4R
OFS
Bipolaroffsetresistor
5R
FB
Internalmatchingfeedbackresistor
6I
输出
DACcurrentoutput
7AGNDAnalogground
digitalinputloaddaccontrol.whenldacis
8ldachigh,dataisloadedfrominputregisterintoa
dacregister,updatingthedacoutput.
writecontroldigitalinput.activelow.当
wristakentologiclow,dataisloadedfrom
9WR
thedigitalinputpins(d0–d15)intoa16-位
inputregister.
10–21d15–d4digitalinputdatabits.d15ismsb.
22DGNDDigitalground
23V
DD
Positivepowersupply
24–27d3–d0digitalinputdatabits.d0islsb.
重置.activelow.whenrstistakento
logiclow,thedacoutputandallinternal
28RST
registersaresettozerocodeforthe
dac8820.
TERMINALFUNCTIONS
PIN#NAMEDESCRIPTION
referenceinputand4-quadrantresistor
1REF
(r2).
4
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