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M2006-02AI622.0800 View Datasheet(PDF) - Integrated Circuit Systems

Part Name
Description
Manufacturer
M2006-02AI622.0800
ICST
Integrated Circuit Systems ICST
M2006-02AI622.0800 Datasheet PDF : 8 Pages
1 2 3 4 5 6 7 8
Integrated
Circuit
Systems, Inc.
External Loop Filter
To provide stable PLL operation, and thereby a low jitter
output clock, the M2006-02A requires the use of an
external loop filter. This is provided via the provided
filter pins (see Figure 4).
Due to the differential signal path design, the
implementation requires two identical complementary
RC filters as shown here.
RLOOP CLOOP
RPOST
RLOOP CLOOP
RPOST
CPOST
CPOST
OP_IN nOP_IN
49
OP_OUT nOP_OUT
85
Figure 4: External Loop Filter
nVC VC
67
M2006-02A
VCSO BASED FEC CLOCK PLL
Product Data Sheet
PLL bandwidth is affected by loop filter component
values, “Mfec” and “Mfin” values, and the “PLL Loop
Constants” listed in AC Characteristics on pg. 7.
The various “Non-FEC ratio” settings can be used to
actively change PLL loop bandwidth in a given
application. See “FEC PLL Ratio Dividers Look-up
Table (LUT)” on pg. 3.
See Example External Loop Filter Component Values table.
PLL Simulator Tool Available
A free PC software utility is available on the ICS website
(www.icst.com). The M2000 Timing Modules PLL
Simulator is a downloadable application that simulates
PLL jitter and wander transfer characteristics. This
enables the user to set appropriate external loop
component values in a given application.
Go to the SAW PLL Simulator Software web page at
www.icst.com/products/calculators/m2000filterSWdesc.htm
Example External Loop Filter Component Values1
VCSO Parameters: KVCO = 800kHz/V, RIN = 50k, VCSO Bandwidth = 700kHz.
FRef
(MHz)
Device Configuration
Example External Loop Filter Component Values Nominal Performance Using These Values
FVCSO
(MHz)
FIN_SEL1:0
pins
FEC_ SEL3:0
pins
R loop
C loop
R post C post PLL Loop Damping Passband
Bandwidth Factor Peaking (dB)
19.44 622.08
0 0 1 1 0 0 11.5k2.2µF
34k470pF 1kHz
6.0
0.05
77.76
0 1 1110
155.52
1 0 1111
622.08
1 1 0 1 1 0 5.11k4.7µF
6.0
0.06
167.3317
1 0 0 0 0 1 113.0k0.22µF
6.0
0.06
669.3266
11
28.0k1.0µF
6.3
0.05
155.52 669.3266 1 0 1 0 0 1 121.0k0.22µF
6.0
0.05
622.08
11
30.1k1.0µF
6.5
0.05
Table 8: Example External Loop Filter Component Values
Note 1: KVCO , VCSO Bandwidth, M Divider Value, and External Loop Filter Component Values determine Loop Bandwidth, Damping Factor, and
Passband Peaking. For PLL Simulator software, go to www.icst.com.
ABSOLUTE MAXIMUM RATINGS1
Symbol Parameter
Rating
Unit
VI
Inputs
-0.5 to VCC +0.5
V
VO Outputs
-0.5 to VCC +0.5
V
VCC Power Supply Voltage
4.6
V
TS Storage Temperature
-45 to +100
oC
Table 9: Absolute Maximum Ratings
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the
device. These ratings are stress specifications only. Functional operation of product at these conditions
or any conditions beyond those listed in Recommended Conditions of Operation, DC Characteristics, or
AC Characteristics is not implied. Exposure to absolute maximum rating conditions for extended periods
may affect product reliability.
M2006-02A Datasheet Rev 1.0
5 of 8
Revised 28Jul2004
Integrated Circuit Systems, Inc. Networking & Communications www.icst.com tel (508) 852-5400
 

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