CDCE62005 datasheet(60/80 Pages) TI

Part #	CDCE62005

Description	Five/Ten Output Clock Generator/Jitter Cleaner With Integrated Dual VCOs

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Manufacturer	TI [Texas Instruments]

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PFD/

CP

EXT_LFN

EXT_LFP

external

internal

external

internal

+

-

VB

R3

C3

C1

R2

C2

C1

R2

C2

r.0

r.1

r.2

r.3

r.4

c. 0

c.1

c.2

c.3

c.4

c. 0

c.1

c.2

c.3

r.0

r. 1

r. base

Ceq

Req

(a)

(b)

(c)

(d)

CDCE62005

SCAS862C – NOVEMBER 2008 – REVISED FEBRUARY 2010

www.ti.com

Loop Filter

Figure 35 depicts the loop filter topology of the CDCE62005. It facilitates both internal and external

implementations providing optimal flexibility.

Figure 35. CDCE62005 Loop Filter Topology

Internal Loop Filter Component Configuration

Figure 35 contains five different loop filter components with programmable values: C1, C2, R2, R3, and C3.

Table 37 shows that the CDCE62005 uses one of four different types of circuit implementation (shown in

Figure 36) for each of the internal loop filter components.

Table 37. CDCE62005 Loop Filter Component Implementation Type

Implementation Type

Component

Control Bits Used

(see Figure 36)

C1

5

a

C2

5

a

R2

5

c

R3

2

d

C3

4

b

Figure 36. CDCE62005 Internal Loop Filter Component Schematics

60

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