S0

VDD

VCTRL

GND

VDDOUT

Y4

XOUT

S2/SCL

S1/SDA

Y1

GND

Y2

Y3

PWM Signal

CDCE937-Q1

Y5

GND

VDDOUT

VDDOUT

Y6

Y7

Xin/CLK

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

3.3V

3.3V

3.3V

1.8V

Control Pin

I2C or Control Pin

I2C or Control Pin

CLK output

CLK output

CLK output

CLK output

CLK output

CLK output

CLK output

27MHz

Crystal

Copyright © 2016, Texas Instruments Incorporated

24

CDCE937-Q1, CDCEL937-Q1

SCAS892C – FEBRUARY 2010 – REVISED DECEMBER 2016

www.ti.com

Product Folder Links: CDCE937-Q1 CDCEL937-Q1

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Copyright © 2010–2016, Texas Instruments Incorporated

11 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

11.1 Application Information

The CDCE937-Q1 device is an easy-to-use, high-performance, programmable CMOS clock synthesizer which

can be used as a crystal buffer, clock synthesizer with separate output supply pin. The CDCE937-Q1 device

features an on-chip loop filter and spread-spectrum modulation. Programming can be done through the I2C

interface, or previously saved settings can be loaded from on-chip EEPROM. The pins S0, S1, and S2 can be

programmed as control pins to select various output settings. This section shows some examples of using the

CDCE937-Q1 device in various applications.

11.2 Typical Application

Figure 14 shows the use of the CDCE937-Q1 device in an infotainment system, such as in head unit or

telematics applications, using a 1.8-V single supply. Note that bypass capacitors are not shown in this schematic.

Figure 14. Single-Chip Solution Using a CDCE937-Q1 Device for Generating Clocking Frequencies