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LMK04816 Datasheet(PDF) 5 Page - Texas Instruments

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Part # LMK04816
Description  LMK04816 Three Input Low-Noise Clock Jitter Cleaner with Dual Loop PLLs
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LMK04816 Datasheet(HTML) 5 Page - Texas Instruments

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background image
R
N
Phase
Detector
PLL2
Internal
VCO
OSCin
OSCout0
OSCout0*
LMK0481x
CPout2
Divider
Digital Delay
Analog Delay
CLKoutY
CLKoutY*
CLKoutX
CLKoutX*
Partially
Integrated
Loop Filter
12 outputs
External
Loop Filter
PLL2
6 blocks
1 output
OSCin*
R
CLKinX
CLKinX*
Phase
Detector
PLL1
External VCXO
or Tunable
Crystal
R
N
Phase
Detector
PLL2
Internal
VCO
External
Loop Filter
Input
Buffer
OSCout0
OSCout0*
LMK0481x
CPout2
Divider
Digital Delay
Analog Delay
CLKoutY
CLKoutY*
CLKoutX
CLKoutX*
Partially
Integrated
Loop Filter
12 outputs
External
Loop Filter
PLL1
PLL2
6 blocks
1 output
3 inputs
N
Internal or external loopback, user programmable
LMK04816
www.ti.com
SNAS597B – JULY 2012 – REVISED APRIL 2013
2.1.2
0-Delay Dual PLL
Figure 2-2 illustrates the use case of 0-delay dual loop mode. This configuration is very similar to
Section 2.1.1 except that the feedback to the first PLL is driven by a clock output. This causes the clock
outputs to have deterministic phase with the clock input. Since all the clock outputs can be synchronized
together, all the clock outputs can be in phase with the clock input signal. The feedback to PLL1 can be
connected internally as shown, or externally using FBCLKin (CLKin1) as an input port.
It is also possible to use an external VCO in place of PLL2's internal VCO.
Figure 2-2. Simplified Functional Block Diagram for 0-delay Dual Loop Mode
2.1.3
Single PLL
Figure 2-3 illustrates the use case of single PLL mode. In single PLL mode only PLL2 is used and PLL1 is
powered down. OSCin is used as the reference input. The internal VCO drives up to 6 divide/delay blocks
which drive 12 clock outputs. The reference at OSCin can be used to drive up the OSCout0 port. OSCin
can also optionally drive up to 4 of the clock outputs.
It is also possible to use an external VCO in place of PLL2's internal VCO.
Figure 2-3. Simplified Functional Block Diagram for Single Loop Mode
Copyright © 2012–2013, Texas Instruments Incorporated
Device Configuration Information
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