P r o d u c t D a t a S h e e t
Integrated
Circuit
Systems, Inc.
M2006-02A
VCSO BASED FEC CLOCK PLL
GENERAL DESCRIPTION
PIN ASSIGNMENT (9 x 9 mm SMT)
The M2006-02A is a VCSO (Voltage Controlled SAW
Oscillator) based clock generator
PLL designed for clock frequency
translation and jitter attenuation.
The device supports both forward
and inverse FEC (Forward Error
Correction) clock multiplication
FIN_SEL0
FEC_SEL0
FEC_SEL1
FEC_SEL2
FEC_SEL3
VCC
P0_SEL
P1_SEL
nFOUT0
FOUT0
GND
nFOUT1
FOUT1
VCC
28
29
30
31
18
17
16
15
14
13
12
11
10
ratios. Multiplication ratios are
A
M2006-02
pin-selected from pre-programming look-up tables.
32
33
34
35
36
( T o p V i e w )
DNC
DNC
FEATURES
◆ Reduced intrinsic output jitter and improved power
supply noise rejection compared to M2006-02
DNC
GND
◆ Low phase jitter of 0.25 ps rms typical
(12kHz to 20MHz or 50kHz to 80MHz)
◆ Pin-selectable PLL divider ratios support forward and
inverse FEC ratio translation, including:
• 255/238 (OTU1) Mapping and 238/255 De-mapping
• 255/237 (OTU2) Mapping and 237/255 De-mapping
• 255/236 (OTU3) Mapping and 236/255 De-mapping
Figure 1: Pin Assignment
Example I/O Clock Combinations
Using M2006-02A-622.0800
◆ Input reference and VCSO frequencies up to 700MHz,
supports loop timing modes
(Specify VCSO frequency at time of order)
PLL Ratio
Input Clock (MHz) Output Clock (MHz)
1/1
622.08, 155.52,
77.76, or 19.44
◆ Supports active switching between inverse-FEC and
non-FEC clock ratios (same VCSO center frequency)
622.08
or
237/255
669.3266, 167.3316,
155.52
◆ Ideal for complex ratio FEC ratio translation and
for use with an unstable reference (i.e., similar to the
M2006-12A - and pin-compatible - but without the
Hitless Switching and Phase Build-out functions)
(inverse FEC) 83.6658, or 20.9165
Table 1: Example I/O Clock Combinations Using M2006-02A-622.0800
Using M2006-02A-669.3266
◆ Single 3.3V power supply
PLL Ratio
Input Clock (MHz) Output Clock (MHz)
◆ Small 9 x 9 mm SMT (surface mount) package
237/255
(FEC rate)
622.08, 155.52,
77.76, or 19.44
669.3266
or
1/1
669.3266, 167.3316,
167.3316
83.6658, or 20.9165
Table 2: Example I/O Clock Combinations Using M2006-02A-669.3266
SIMPLIFIED BLOCK DIAGRAM
Loop
Filter
M2006-02A
DIF_REF0
0
nDIF_REF0
Rfec Div
DIF_REF1
1
FOUT0
P0 Div
VCSO
(1 or 4)
nFOUT0
nDIF_REF1
Mfin Div
Mfec Div
(1, 4, 8, or 32)
REF_SEL
4
2
Mfec / Rfec
Divider LUT
FOUT1
FEC_SEL3:0
FIN_SEL1:0
P1 Div
(1 or 4)
nFOUT1
Mfin Divider
LUT
P0_SEL
Figure 2: Simplified Block Diagram
P1_SEL
M2006-02A Datasheet Rev 1.0
Revised 28Jul2004
M2006-02A VCSO Based FEC Clock PLL
Integrated Circuit Systems, Inc. ● Networking & Communications ● www.icst.com ● tel (508) 852-5400