Texas Instruments CDCM7005 manual Quick Start

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Chapter 2

Quick Start

In order to setup the EVM quickly and to take some measurements at default settings, the following actions are required:

-Supply 3.3 V to P1, LED D4 will be on.

-Apply a single-ended reference clock to the reference clock input PRI_REF (pin A1) or SEC_REF (pin B1). For default setting, the reference clock must be 1/8th of the VC(X)O frequency. If REF_SEL is set to 1, then PRI_REF is selected. If REF_SEL is set to 0, then SEC_REF is selected. This selection can be realized via J26 (header 1 and 2 is high; header 2 and 3 is low).

-Connect Y0/Y0B (or Y1/Y1B) to oscilloscope in order to check an output signal. Ensure the oscilloscope has 50 Ω to ground termination.

After power up, D1 is on if there is a valid reference clock and D2 is on if there is a valid VC(X)O clock for the CDCM7005. If D3 turns on, then the reference clock and the VC(X)O clocks are phase locked.

Quick Start

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Contents User’s Guide Important Notice EVM Important Notice EVM Warnings and Restrictions Read This First About This ManualContents Figures TablesIntroduction TopicCDCM7005 Functional Block Diagram Quick Start EVM Hardware TopicPower Supply P1, P2 Board View and Connector LocationHardware Configuration Onboard Switches and Indicators SW1−SW2, D1−D4Programming Interfaces J30, J31 Loop Filter J32−J34Vcxo Inputs and Outputs J16−J18 AC-Coupling at Priref C1, R4, R6 and Secref C5, R13, R15Serial Peripheral Interface SPI Software Software Installation Functional DescriptionApplication Circuit Diagram Application Circuit Diagram Passive Loop FilterExternal Active Loop Filter Using OPA341 CDCM7005Parts List, Board Layout, and Schematics Parts List QTYPart Number Designator ERJ−2RKF1500X Board Layout −1. Component View and Silkscreen Top View−2. Component View and Silkscreen Bottom View −3. Top Layer View −4. Bottom Layer View −5. Ground Plane View Schematics −6. Power Layer ViewVe RParts List List PartsList List Ctrlle Ctrlclk Ctrldata