CDCE937 datasheet(12/39 Pages) TI2

12 / 39 page

EEPROM

Xin/CLK

Xout

VDD

GND

Input Clock

Vctr

Vddout

VCXO

LVCMOS

CMOS

Pdiv1

10-Bit

CMOS

Pdiv7

Pdiv6

CMOS

Pdiv5

Pdiv4

CMOS

Pdiv3

Pdiv2

7-Bit

CMOS

Programming

and

SDA/SCL

PLL Bypass

PLL1

with SSC

PLL Bypass

PLL 2

with SSC

PLL Bypass

PLL 3

with SSC

S1/SDA

S2/SCL

7-Bit

CDCE937-Q1, CDCEL937-Q1

SCAS892C – FEBRUARY 2010 – REVISED DECEMBER 2016

www.ti.com

Product Folder Links: CDCE937-Q1 CDCEL937-Q1

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10.2 Functional Block Diagram

10.3 Feature Description

10.3.1 Control Terminal Setting

The CDCEx937-Q1 has three user-definable control terminals (S0, S1, and S2) that allow external control of

device settings. They can be programmed to any of the following setting:

•

Spread spectrum clocking selection

→ spread type and spread amount selection

•

Frequency selection

→ switching between any of two user-defined frequencies

•

Output state selection

→ output configuration and power down control

The user can predefine up to eight different control settings. Table 1 and Table 2 explain these settings.

Table 1. Control Terminal Definition

EXTERNAL

CONTROL

BITS

PLL1 SETTING

PLL2 SETTING

PLL3 SETTING

Y1 SETTING

Control

Function

PLL

Frequency

Selection

SSC

Selection

Output

Y2/Y3

Selection

PLL

Frequency

Selection

SSC

Selection

Output

Y4/Y5

Selection

PLL

Frequency

Selection

SSC

Selection

Output

Y6/Y7

Selection

Output Y1 and

Power-Down

Selection

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