CDCE62005 datasheet(64/80 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

FromInputDivider

FromFeedback Divider

ToLoopFilter

FromInputDivider

FromFeedback Divider

Locked

Unlocked

FromInputDivider

FromFeedback Divider

25 24 23 22

Register 5

Lock Detect Window (Max)

Lock Detect Window Adjust

(a)

(b)

27 26

FromDigital

Lock Detector

PLL_LOCK

1 = Locked

O = Unlocked

(c)

CDCE62005

SCAS862C – NOVEMBER 2008 – REVISED FEBRUARY 2010

www.ti.com

Lock Detect

Digital Lock Detect

The CDCE62005 provides both an analog and a digital lock detect circuit. With respect to lock detect, two signals

whose phase difference is less than a prescribed amount are ‘locked’ otherwise they are ‘unlocked’. The phase

frequency detector / charge pump compares the clock provided by the input divider and the feedback divider;

using the input divider as the phase reference. The digital lock detect circuit implements a programmable lock

detect window. Table 43 shows an overview of how to configure the digital lock detect feature. When selecting

the digital PLL lock option, the PLL_LOCK pin will possibly jitter several times between lock and out of lock until

the PLL achieves a stable lock. If desired, choosing a wide loop bandwidth and a high number of successive

clock cycles virtually eliminates this characteristic. PLL_LOCK will return to out of lock, if just one cycle is outside

the lock detect window or if a cycle slip occurs.

Figure 37. CDCE62005 Digital Lock Detect

Table 43. CDCE62005 Digital Lock Detect Control

DIGITAL LOCK DETECT

Bit Name

→

ADLOCK

LOCKDET

LOCKW(3)

LOCKW(2)

LOCKW(1)

LOCKW(0)

Register.Bit

→

5.27

5.26

5.25

5.24

5.23

5.22

Lock Detect Window

1

X

Analog Lock

X

0

X

1 cycle in lock window triggers a lock

64 continuous cycles in lock window triggers a

X

1

X

lock

0

X

0

Narrow Window

0

X

0

1

One step wider than narrow window

0

X

0

1

0

Two steps wider than narrow window

0

X

0

1

0

Three steps wider than narrow window

0

X

0

1

0

1

Four steps wider than narrow window

•

0

X

1

0

Widest Window

0

X

1

Reserved

64

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