Texas Instruments CDCM7005 manual External Active Loop Filter Using OPA341

Page 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

R3

10 kΩ

C3

100 nF

 

 

 

 

 

 

 

 

R2

C2

 

 

 

 

 

Vcc

 

10

µF

 

 

 

 

 

 

4.7 kΩ

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vcc

 

 

 

 

CDCM7005

 

R5

 

 

 

 

 

 

 

PRI_REF

 

 

10 kΩ

 

 

 

 

 

 

 

SEC_REF

 

 

 

 

InN

 

 

 

 

 

 

 

 

R1

 

 

 

 

 

 

 

 

 

180

OPA341 Out

 

 

 

 

 

 

 

 

InP

 

 

 

 

 

 

CP_OUT

 

 

 

 

 

 

 

 

 

CTRL_LE

STATUS_REF

 

R6

C1

 

 

SPI

 

 

C1

10 kΩ

100 nF

 

 

 

 

CTRL_DATA STATUS_VC(X)O

 

 

 

 

 

 

 

 

CTRL_CLK

PLL_LOCK

100 nF

 

 

 

 

 

VCC

 

VCC

 

 

 

 

 

 

 

 

 

 

130 Ω

YnA

 

10 nF

 

 

 

 

130 Ω

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VC(X)O_IN

 

 

 

 

 

 

 

 

 

 

 

 

10 nF

 

 

 

 

 

 

 

VC(X)O_IN

YnB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R

 

 

 

R

R

 

 

 

 

R

 

150 Ω

150

 

 

 

 

82

 

 

 

 

 

 

 

 

 

82

 

 

 

 

 

 

 

Application Circuit Diagram

5-3

Image 19
Contents User’s Guide Important Notice EVM Important Notice EVM Warnings and Restrictions About This Manual Read This FirstContents Tables FiguresTopic IntroductionCDCM7005 Functional Block Diagram Quick Start Topic EVM HardwareOnboard Switches and Indicators SW1−SW2, D1−D4 Board View and Connector LocationHardware Configuration Power Supply P1, P2Loop Filter J32−J34 Programming Interfaces J30, J31AC-Coupling at Priref C1, R4, R6 and Secref C5, R13, R15 Vcxo Inputs and Outputs J16−J18Serial Peripheral Interface SPI Software Functional Description Software InstallationApplication Circuit Diagram Passive Loop Filter Application Circuit DiagramCDCM7005 External Active Loop Filter Using OPA341Parts List, Board Layout, and Schematics QTY Parts ListPart Number Designator ERJ−2RKF1500X −1. Component View and Silkscreen Top View Board Layout−2. Component View and Silkscreen Bottom View −3. Top Layer View −4. Bottom Layer View −5. Ground Plane View −6. Power Layer View SchematicsVe RParts List List PartsList List Ctrlle Ctrlclk Ctrldata