CDCE62002 datasheet(7/49 Pages) TI

Part #	CDCE62002

Description	Four Output Clock Generator/Jitter Cleaner With Integrated Dual VCOs

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Manufacturer	TI [Texas Instruments]

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COMPUTING THE OUTPUT FREQUENCY

Output

Divider 0

U0P

U0N

Output

Divider 1

U1P

U1N

PFD/

CP

Prescaler

Feedback

Divider

Input

Divider

Reference

Divider

EXT_LFP

EXT_LFN

F

R

I

P

O

F

OUT

Fin

OUT

IN

F

R I O

=

×

× ×

(1)

OUT

1.750GHz

O P F

2.356GHz

<

×

<

(2)

IN

COMP

F

R I

=

×

(3)

CDCE62002

www.ti.com.............................................................................................................................................................. SCAS882A – JUNE 2009 – REVISED JULY 2009

Figure 7 presents the block diagram of the CDCE62002 synthesizer highlighting the clock path for a single

output. It also identifies the following regions containing dividers comprising the complete clock path:

• R: Is the Reference divider values.

• O: The output divider value (see Output Block for more details)

• I: The input divider value (see Synthesizer Block for more details)

• P: The Prescaler divider value (see Synthesizer Block of more details)

• F: The cumulative divider value of all dividers falling within the feedback divider (see Synthesizer Block for

more details)

Figure 7. CDCE62002 Clock Path – Synthesizer

With respect to Figure 7, any output frequency generated by the CDCE62002 relates to the input frequency

connected to the Synthesizer Block by the following equation:

Equation 1 holds true subject to the following constraints:

And the comparison frequency FCOMP,

40.0 kHz

≤ FCOMP ≤ 40 MHz

Where:

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