For customers designing Texas Instruments Low Jitter Synthesizer and Jitter Cleaner "LMK04828B"

Basic Circuit Block Diagram
Configuration
Simulation Results
Comparison Simulator vs Measurement

Epson VCXO matching trial for Texas Instruments Jitter Cleaner LMK04828B
Comparison with Texas Instruments simulator (National Clock Design Tool) and measurement data.

Matching Results

The simulation results matched the measured data well.
As conclusion, VCXOs (VG-4513CA,VG4501CA) have good performance with TI LMK04828B.
For more information, please see the following:

Epson Crystal Product Lineups

Product	Size [mm]	Applications	Images
VG-4501CA CMOS output	7.0 x 5.0 x 1.6	optical networking and base station
VG-4513CA LV-PECL output	7.0 x 5.0 x 1.6	optical networking and base station

Basic Circuit Block Diagram

Configuration

TI LMK04828B Jitter Cleaner(Dual PLL typ.)

LMK04828B Configuration PLL1

VCXO parameter (measured data)

PLL1 Loop Filter - before adjustment (original Value)

VCXO frequency	VG-4501CA 122 MHz	VG-4513CA 122 MHz
KV	15.7 kHz/V	9.55 kHz/V
lcp	15.7 kHz/V	9.55 kHz/V
LOOP BW	40.564 Hz	28.265 Hz
Phase Margin	40.673 degrees	46.888 degrees
Gamma Optimaztion Factor	5.857	2.844
Natural Frequency	17.851 Hz	13.922 Hz
Damping Factor	1.487	1.16

PLL1 Loop Filter adjustment for Epson VCXOs

Components	VG-4501CA 122.88 MHz CMOS output	VG-4513CA 122.88 MHz LV-PECL output
KV	15.7 kHz/V	9.55 kHz/V
R2_A1	10K	18K
C1_A1	390 nF	220 nF
C2_A1	2700 nF	1000 nF +470 nF
I ChargePump	100 uA	100 uA
LOOP BW	14.148 Hz	15.195 Hz
Phase Margin	50.5 degrees	50.2 degrees

LMK04828B Configuration PLL2

PLL2 Loop Filter

Evaboard default value - no change

C1_A2	0.047 nF	Evaboard original
C2_A2	3.9 nF	Evaboard original
C3 Internal	10 pF	minimum
C4 Internal	10 pF	minimum
R2_A2	0.62 Kohm	Evaboard original
R3 Internal	0.2 Kohm	minimum
R4 Internal	0.2 Kohm	minimum
I ChargePump	3200 uA	maximum

PLL2 Loop Filter Characteristics

VCXO frequency	122 MHz R=1 N=8
KV	18.3734 MHz/V
LOOP BW	245.515 kHz
Phase Margin	70.86 degrees
Gamma Optimaztion Factor	0.269
Natural Frequency	0.2 Kohm
R4 Internal	125.07 kHz
Damping Factor	0.95

PLL2 Bode Plot PFD2=122.88 MHz

Output Setup

Materials

Evaluation Board	LMK04828BEVAL	1 pcs
OCXO	OX-6501GG	30.72 MHz
ESC Signal Generator	E4438C	30.72 MHz FM Noise Mod
Power Supply	5 V	E363A and othwes
VCXO1	VG-4513CA	Epson 122.88/245.76/491.52 MHz
VCXO2	VG4501CA	Epson 122.88 MHz CMOS
PC	Thinkpad X32	WindowsXP
Chip Control Application	CodeLoader4	Version4.7.5 Part File v1.8.5
Simulator	NCDT Clock Disign Tool	Version1.3.5