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DIGITALCHARACTERISTICS
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0
0 10 20 30 40 50 60 70 80
F
S
= 170 msps
F
在
= 10.1 mhz
sfdr = 91.5 dbc
snr = 74.09
dBFS
ADS5545
SLWS180–SEPTEMBER2005
thedcspecificationsrefertotheconditionwherethedigitaloutputsarenotswitching,butarepermanentlyatavalidlogic
level0or1avdd=drvdd=3.3v,i
O
=3.5ma,r
L
=100
Ω
.
(1)
alllvdsandcmosspecificationsarecharacterized,butnottestedatproduction.
PARAMETERTESTCONDITIONSMINTYPMAXUNIT
DIGITALINPUTS
高-levelinputvoltage2.4v
低-levelinputvoltage0.8v
高-levelinputcurrent10
µ
一个
低-levelinputcurrent10
µ
一个
Inputcapacitance4pF
DIGITALOUTPUTS–CMOSMODE
高-leveloutputvoltage3.3v
低-leveloutputvoltage0v
outputcapacitanceoutputcapacitanceinsidethedevice,fromeither4pf
outputtoground
DIGITALOUTPUTS–LVDSMODE
高-leveloutputvoltage1375mv
低-leveloutputvoltage1025mv
outputdifferentialvoltage,|v
OD
|350mV
V
OS
Outputoffsetvoltage
(1)
一般-modevoltageofoutpandoutm1200mv
outputcapacitanceoutputcapacitanceinsidethedevice,fromeither4pf
outputtoground
Changein|V
OD
|,|
∆
V
OD
|25mV
Changein|V
OS
|,|
∆
V
OS
|25mV
(1)i
O
referstothelvdsbuffercurrentsetting,r
L
isthedifferentialloadresistancebetweenthelvdsoutputpair.
figure1.ads5545fftplotat170mspsand10-mhzinput
4
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