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| 型号： | WI125 EVAL KIT |
| 厂商： | Connor-Winfield |
| 文件页数： | 8/18页 |
| 文件大小： | 0K |
| 描述： | GPS TIMING RECEIVER EVAL BOARD |
| 产品培训模块： | 125 Series GPS Based Timing and Synchronization Products |
| 标准包装： | 1 |
| 主要目的： | 计时，时钟发生器，同步器，GPS |
| 嵌入式： | 否 |
| 已用 IC / 零件： | WI125 |
| 主要属性： | 1PPS/ 10 MHz 相位校准功能 |
| 次要属性： | LED 状态指示器 |
| 已供物品： | 模块，板，天线，线缆，电源 |
| 其它名称： | CW681 W125 EVAL KIT |
Wi125 Data Sheet #:
SG170
Page 16 of 20
Rev:
04
Date:
11/29/11
Copyright 2011 The Connor-Winfield Corp. All Rights Reserved
Specifications subject to change without notice
8 APPLICATION HINTS
ThefollowingarealistofapplicationhintsthatmayhelpinimplementingsystembasedontheWi125.
8.1 Power Supply
ThepowersupplyrequirementsoftheWi125canallbeprovidedfromasingle3.3Vsupply.Tosimplifysystem
integrationon-boardregulatorsprovidethecorrectvoltagelevelsfortheRFandoscillator(2.9Vor3.0V)andlow
voltagedigitalcore(1.8V).InpowersensitiveapplicationsitisrecommendedthattheDIG_1V8supplyisprovided
fromahighefficiencyexternal1.8Vsourcee.g.switchmodepowersupply,ratherthantheon-boardlinearregula-
tor.
IfthesourceimpedanceofthepowersupplytotheWi125ishighduetolongtracks,filteringorothercauses,local
decouplingofthesupplysignalsmaybenecessary.Careshouldbetakentoensurethatthemaximumsupply
rippleatthepinsoftheWi125is50mVpeaktopeak.
8.2 RF Connection
TheRFconnectiontotheWi125canbedoneintwoways.Thepreferredmethodistousestandardmicrostrip
designtechniquestotrackfromtheantennaelementtotheRF_INcastellation.Thisalsoallowsthesystems
integratortheoptionofdesigninginexternalconnectorssuitablefortheapplication.Theusercaneasilyfitan
externallymountedMCX,SMAorsimilarconnector,provideditisplacedadjacenttotheRF_INcastellation.Ifthe
trackingguidelinesgivenbelowarefollowed,theimpedancematchwillbeacceptable.Thediagrambelowshows
howthiscouldbeachieved.Inthisdiagram,thecentreviaoftheRFconnectorispresumedtobeplatedthrough
withaminimalpadtopandbottom.ThePCBmaterialisassumedtobe1.6mmthickFR4withadielectricconstantof
4.3.Twosituationsareconsidered;onewithnogroundplaneandonewithagroundplaneonthebottomoftheboard,
underneaththeRFconnector.InbothcasesthereisnoinnerlayertrackingundertheRFconnector.
SMA Connector
RF_IN
Top Tracking
Ground Plane
(if used)
PIN 22
Figure 7 RF Tracking Example
ThewidthsoftheRF_INtrackandtheassociatedgapsaregiveninthetablebelow.
Scenario
Track Width (1/1000Inch)
Gap Width (1/1000Inch)
Withoutgroundplane
37
6
56
8
Withgroundplane
32
6
43
8
Table 7 RF Track & Gap Widths
Alternatively,theusercanattachtheantennatotheHiroseH.FL-R-SMTusingaflyingleadfittedwithasuitable
plug.
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