Texas Instruments CDCE6214-Q1EVM, User Manual, Page: 9 / 27

9 SNAU244 – July 2019
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Copyright © 2019, Texas Instruments Incorporated
Modes of Operations
Chapter 2
SNAU244 – July 2019
Modes of Operations
2.1 Input Configuration
2.1.1 Input Selection
Two inputs—the "PRIREF" (primary reference) and "SECREF" (secondary reference)—are selected by a
combination of the register "REF_SEL" (R2[1:0]) and pin 4 "REFSEL". Register R2[1:0] overrides pin 4.
To enable pin control for input selection, go to TICS Pro "Input" page and set register "REF_SEL" to "Pin".
Pull pin "REFSEL" low (SECREF) or high (PRIREF) using jumper J12.
To use register control for input selection, set the register "REF_SEL" directly, For the primary reference,
feed reference source from SMA connectors J1 and/or J2. For the secondary reference, if crystal input is
preferred, refer to
Section 2.1.2 . Otherwise, populate C5. R7, C6, R11, J3, J4 and feed reference source
from SMA connectors J3 and/or J4.