差分信号电路的设计
LVDS(Low-VoltageDifferentialSignaling)设计及应用
表3.1LVDS驱动器直流与交流电特性
言濑ParameterConditionsMinimumTypicalMaximum
V曲Outputvoltagehigh,V∞orVobRload=100lQ±15%1475mV
VaOutputvoltagelow,V04orVebR10ad=100Q±15%925mV
I‰lOutputdifferentialvoltageRIoad二100Q±15%250mV450mV
UOutputoffsetvoltageRload=100Q±15%1125mV1250mV1375mV
IA‰ChangeinI‰Ibetween一0andRload=100Q±15%50mV/150m
‘1’V舞
△V∞ChangeinV∞between‘0’and‘1’Rload=100Q±15%50mV
I媳IIbOutputcurrentDrivershoaedto24mA
ground
ImOutputcurrentDriversshooed12mA
together
#‘50mV’iJforsteadystateand‘150raV'fordynamic.
诹ParameterConditionsMinMax
ClockClocksignaldutycycle250MHz45%55%
tfallV“falltime,20-80%RM=IOOQ±15%260ps0.3+Tu甜
tmVoarisetime.20-80%R10ad=lOOfj±15%260psO.3 Tui
TIkwlltphh-铀岫Iorltphm一~Ihl,differentialR10ad=100f2-*15%50ps
skew
群弛f括theunitinterval:
3.2差分信号抗噪特性从差分信号传输线路上可以看出,若是理想状况,线路没有干扰时,在