Manuals / Texas Instruments / Computer Equipment / Network Card

Texas Instruments CDCM7005 External Active Loop Filter Using OPA341, Application Circuit Diagram

Models: CDCM7005

1 34

Download 34 pages 30.24 Kb

Page 19

Image 19

Application Circuit Diagram

5.1.2External Active Loop Filter Using OPA341

Figure 5−2. CDCM7005 With a External Active Loop Filter Using OPA341

VC(X)O

491.52 MHz

PECL_OUT_BV_CTRL PECL_OUT

Low-Pass Filter

10 kΩ

100 nF

								R2	C2
					Vcc			R2	10	∝F
								4.7 kΩ	10	∝F
								4.7 kΩ
									Vcc
			CDCM7005			R5
			PRI_REF			10 kΩ
			SEC_REF					InN
			SEC_REF				R1
							180	Ω OPA341 Out
								InP
				CP_OUT
			CTRL_LE	STATUS_REF		R6	C1
SPI			CTRL_LE	STATUS_REF	C1	10 kΩ	100 nF
SPI			CTRL_DATA STATUS_VC(X)O		C1
			CTRL_CLK	PLL_LOCK	100 nF
VCC		VCC
		130 Ω		YnA		10 nF
130 Ω						10 nF

			VC(X)O_IN
			VC(X)O_IN			10 nF
			VC(X)O_IN	YnB		10 nF
				YnB
R				R	R	Ω
R	Ω	R		150 Ω	150	Ω
82	Ω	R	Ω
		82	Ω

Application Circuit Diagram

5-3

Page 19

Image 19

Texas Instruments CDCM7005 manual External Active Loop Filter Using OPA341, Application Circuit Diagram

Contents

2005 User’s GuideCDCM7005 QFN Package Evaluation Module Manual HPA/High Speed CommunicationsProducts IMPORTANT NOTICEApplications EVM IMPORTANT NOTICE EVM WARNINGS AND RESTRICTIONS Preface CDCM7005 Data Sheet, SCAS793, Texas InstrumentsRead This First How to Use This Manual2 Quick Start Contents6 Parts List, Board Layouts, and Schematics 1 IntroductionTables Figures3−1 Filter Configurations Page IntroductionChapter Topic⎟ 4 o 1.1 CDCM7005 Functional Block DiagramCDCM7005 Functional Block Diagram ⎟ ⎟ ⎟ ⎟ ⎟ 6 ⎟Chapter Quick StartChapter EVM HardwarePage Topic3.2.2 Onboard Switches and Indicators SW1−SW2, D1−D4 3.1 Board View and Connector Location3.2 Hardware Configuration 3.2.1 Power Supply P1, P2Default setting Passive Loop Filter Table 3−1. Filter Configurations3.2.3 Programming Interfaces J30, J31 3.2.4 Loop Filter J32−J343.2.7 AC-Coupling at PRIREF C1, R4, R6 and SECREF C5, R13, R15 3.2.6 VCXO Inputs and Outputs J16−J18Topic Serial Peripheral Interface SPI SoftwareChapter PageFigure 4−1. Screen View 4.2 Software InstallationFollow the steps below in order to install the SPI control software 4.1 Functional DescriptionTopic Application Circuit DiagramThis chapter discusses the application circuit diagram ChapterFigure 5−1. CDCM7005 With a Passive Loop Filter Configuration 5.1 Application Circuit Diagram5.1.1 Passive Loop Filter Application Circuit Diagram 5.1.2 External Active Loop Filter Using OPA341Figure 5−2. CDCM7005 With a External Active Loop Filter Using OPA341 Application Circuit DiagramChapter Parts List, Board Layout, and SchematicsParts List SchematicsPart Number Parts ListParts List FootprintPart Number Parts ListParts List, Board Layout, and Schematics FootprintDesignator Parts ListFootprint Part NumberParts List, Board Layout, and Schematics 6.2 Board LayoutFigure 6−1. Component View and Silkscreen Top View Parts ListParts List Figure 6−2. Component View and Silkscreen Bottom ViewParts List Figure 6−3. Top Layer ViewParts List, Board Layout, and Schematics Parts List Figure 6−4. Bottom Layer ViewParts List Figure 6−5. Ground Plane ViewParts List, Board Layout, and Schematics Figure 6−6. Power Layer View 6.3 SchematicsParts List Module ve RParts ListParts List, Board Layout, and Schematics 6-11CDCM7005EVMQFN−SCH ListCDCM7005QFN Evaluation Module PartsList SchematicsPassive Filter Default Setting short pin 1 & 3 on J3 2, J33 PartsCDCM7005QFN Evaluation Module ListCDCM7005EVMQFN−SCH A CDCM7005QFN Evaluation Module Parts List, Board Layout, and SchematicsCDCM7005EVMQFN−SCH