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Default Device Setting

PLL1

XO

or

2LVCMOS

or

Differential

Input

MUX

MUX

DividerM

1

MUX

DividerM

375

PLL3

PFD

Filter

VCO

PLL2

w/SSC

PFD

Filter

VCO

DividerN

8

DividerN

250

DividerN

3136

SO/CLK_SEL

S1

SCLOCK

OutputSwitchMatrix

27MHz

PROGRAMMING

LOGIC

SMBUS

LOGIC

PFD

Filter

VCO

SDATA

P0-Div

10

P1-Div

20

P2-Div

8

P3-Div

9

P4-Div

32

P5-Div

4

CLK_IN0

CLK_IN1

27MHz

Crystal

SSC-OFF

Y5

Y4

Y3

Y2

Y1

Y0

27MHz

27MHz

27MHz

27MHz

LV

CMOS

LV

CMOS

LV

CMOS

LV

CMOS

LV

CMOS

LV

CMOS

27MHz

DividerM

27

fout=

finxN

MxP

, i.e.fout=

27MHzx8

(1x8)

=27MHz

(1)

CDC706

SCAS829A – SEPTEMBER 2006 – REVISED MARCH 2007

The CDC706 is pre-programmed with a factory default configuration as shown below. This puts the device in an

operating mode without the need to program it first. The default setting appears after power is switched on or

after a power-down/up sequence until it is re-programmed by the user to a different application configuration. A

new register setting is programmed via the serial SMBUS Interface.

A different default setting can be programmed upon customer request. Contact a Texas Instruments sales or

marketing representative for more information.

NOTE: All outputs are enabled and in non-inverting mode. S0, S1, and SSC comply according the default setting described

in Byte 10 and Byte 25 respectively.

Figure 13. Default Device Setting

The output frequency can be calculated:

15

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