概述
数据手册M902-01I187.5000 概述
VCSO BASED GBE CLOCK GENERATOR VCSO基于GBE时钟发生器
M902-01I187.5000 数据手册
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PDF下载P r o d u c t D a t a S h e e t
Integrated
Circuit
Systems, Inc.
M902-01
VCSO BASED GBE CLOCK GENERATOR
GENERAL DESCRIPTION
PIN ASSIGNMENT (9 x 9 mm SMT)
The M902-01 is a PLL (Phase Locked Loop) based
clock generator that uses an
internal VCSO (Voltage Controlled
SAW Oscillator) to produce a very
low jitter output clock. It is ideal for
Gigabit Ethernet. The output clock
(frequency of 156.25 or 187.50MHz
for example) is provided from two
XTAL_2
NC
NC
NC
28
29
30
31
32
33
34
35
36
18
17
16
15
14
13
12
11
10
LVPECL clock output pairs. (Specify frequency at time
of order.) The accuracy of the output frequency is
assured by the internal PLL, which phase-locks the
internal VCSO to the reference input frequency (25 or
30MHz for example). The input reference can either
be an external crystal, utilizing the internal crystal
oscillator, or a stable external clock source such as
a packaged crystal oscillator.
NC
NC
NC
VCC
DNC
DNC
DNC
nFOUT1
FOUT1
GND
nFOUT0
FOUT0
VCC
M902-01
( T o p V i e w )
GND
FEATURES
◆ Output clock frequency from 125MHz to 190MHz
(Consult factory for frequency availability)
Figure 1: Pin Assignment
◆ Two identical LVPECL output pairs
◆ Integrated SAW (surface acoustic wave) delay line
◆ Low jitter 0.5ps rms (over 12kHz-20MHz)
◆ Ideal for Gigabit Ethernet clock reference
◆ Output-to-output skew < 100ps
Example Output Frequency Configurations
Ref Clock
Frequency
(MHz)
Output
Frequency1
(MHz)
PLL
Application
Ratio
◆ External XTAL or LVCMOS reference input
◆ Selectable external feed-through clock input
◆ STOP clock control (Logic 1 stops output clocks)
◆ Industrial temperature grade available
◆ Single 3.3V power supply
20
25
30
125.00
156.25
187.50
GbE
25/4
10GbE
12GbE
Table 1: Example Output Frequency Configurations
Note 1: Specify output clock frequency at time of order
◆ Small 9 x 9 mm SMT (surface mount) package
SIMPLIFIED BLOCK DIAGRAM
M902-01
VSCO
External
Crystal
Frequency
Multiplying
PLL
XTAL
OSC
LVPECL
Output
Clock Pairs
(e.g., 156.25
O
or
Divider
Reference
Clock Input
(e.g., 25 or 30MHz)
1
or 187.50MHz)
External
Loop Filter
External External
Output
Clock STOP
Control
Clock
Clock
Input
Select
Figure 2: Simplified Block Diagram
M902-01 Datasheet Rev 2.1
Revised 24Jun2004
M902-01 VCSO Based GbE Clock Generator
Integrated Circuit Systems, Inc. ● Networking & Communications ● www.icst.com ● tel (508) 852-5400
M902-01
Integrated
Circuit
Systems, Inc.
VCSO BASED
GB
E CLOCK
G
ENERATOR
P r o d u c t D a t a S h e e t
DETAILED BLOCK DIAGRAM
RLOOP CLOOP
RPOST
External
Loop Filter
Components
CPOST
CPOST
RLOOP CLOOP
nOP_IN OP_OUT
RPOST
M902-01
OP_IN
RIN
nOP_OUT
nVC
VC
Phase
Detector
SAW Delay Line
XTAL_1 / REF_IN
XTAL
OSC
R Divider
R = 4
XTAL_2
RIN
Loop Filter
Amplifier
Phase
Shifter
VCSO
M Divider
M = 25
O
1
FOUT1
nFOUT1
Phase Locked Loop (PLL)
EXT_CLK
FOUT0
nFOUT0
EN_EXT_CLK
STOP
Figure 3: Detailed Block Diagram
PIN DESCRIPTIONS
Number Name
1, 2, 3, 10, 14, 26 GND
I/O
Ground
Configuration
Description
Power supply ground connections.
4
9
OP_IN
nOP_IN
Input
External loop filter connections. See Figure 5,
External Loop Filter, on pg. 4.
5
8
nOP_OUT
OP_OUT
Output
6
7
nVC
VC
Input
11, 19, 33
VCC
Power
Power supply connection, connect to +3.3V.
12
13
FOUT0
nFOUT0
Clock output pairs, differential LVPECL output
(156.25 MHz for the M902-01-156.2500)
Output
No internal terminator
15
16
FOUT1
nFOUT1
17, 18
20, 21, 22
29, 30, 31, 32
NC
No internal connection
Logic 1 enables the EXT_CLK input.
Use Logic 0 for normal operation.
1
23
24
25
EN_EXT_CLK
EXT_CLK
STOP
Input
Input
Input
Internal pull-down resistor
External clock feed-through: 0 to 200 MHz
Logic 1 stops clock outputs.
Use Logic 0 for normal operation.
1
Internal pull-down resistor
External crystal connection. Also accepts
LVCMOS/LVTTL compatible clock source.
27
XTAL_1 / REF_IN
Input
Input
External crystal connection. Leave unconnected
when driving pin 27 with external clock reference.
28
XTAL_2
DNC
34, 35, 36
Do Not Connect.
Table 2: Pin Descriptions
Note 1: For typical value of internal pull-down resistor, see DC Characteristics, Pull-down on pg. 6.
M902-01 Datasheet Rev 2.1
2 of 8
Revised 24Jun2004
Integrated Circuit Systems, Inc. ● Networking & Communications ● www.icst.com ● tel (508) 852-5400
M902-01
Integrated
Circuit
Systems, Inc.
VCSO BASED
GB
E CLOCK
G
ENERATOR
P r o d u c t D a t a S h e e t
The PLL
FUNCTIONAL DESCRIPTION
The PLL (Phase Locked Loop) includes the phase
detector, the VCSO, a feedback divider (labeled
“M Divider”), and a reference divider (“R Divider”).
The M902-01 is a PLL (Phase Locked Loop) based
clock generator that generates output clocks
synchronized to an input reference clock.
The feedback divider divides the VCSO output
frequency by a fixed value “M” to match the reference
frequency provided to the phase detector by the
reference divider.
The M902-01 combines the flexibility of a VCSO
(Voltage Controlled SAW Oscillator) with the stability of
a crystal oscillator.
Input Reference
By controlling the frequency and phase of the VCSO,
the phase detector precisely locks the frequency and
phase of the feedback divider output to that of the
reference divider output.
The input reference can either be an external, discrete
crystal or a stable external clock source such as a
packaged (temperature-compensated) crystal
oscillator.
The relationship between the VCSO output frequency,
the M Divider, the R Divider and the input reference
frequency is defined as follows:
• If an external crystal is used with the on-chip crystal
oscillator circuit (XTAL OSC), the external crystal
should be a parallel-resonant, fundamental mode
crystal. Apply it to the XTAL_1 / REF_IN and XTAL_2 input
pins. External crystal load trim capacitors are also
required. (See “Crystal Specifications” on pg. 4.)
M
R
----
Fvcso = Fxtal ×
For the M902-01-156.2500 (see “Ordering Information” on pg. 8):
• VCSO output frequency = 156.25MHz
• If an external LVCMOS/LVTTL clock source is used,
• Input reference frequency = 25MHz
apply it to the XTAL_1 / REF_IN input pin.
• M=25
• R= 4
In either case, the reference clock is supplied to the
phase detector of the PLL. The M902-01 includes a
reference divider that divides the input reference
frequency by a fixed value “R” and provides the result to
the phase detector.
Therefore, for the M902-01-156.2500:
25
---------
4
156.25MHz = 25MHz
The EX_CLK pin is available for a clock feed-through
mode for testing. See “External Clock Feed-through”
on pg. 3.
M
----
The product of the input crystal frequency and
falls within the lock range of the VCSO.
R
External Clock Feed-through
The EXT_CLK pin provides an input for an external
single-ended clock that directly drives the LVPECL
clock outputs. This pin is intended for system debugging
and performance evaluation..
EN_EXT_CLK Logic 1 enables the EXT_CLK input.
Use Logic 0 for normal operation.
EXT_CLK
Apply an external LVCMOS/LVTTL clock source
for 0 to 200 MHz feed-through operation.
Leave inactive for normal operation.
1
Note 1: In applications where EXT_CLK is active while the SAW PLL
signal path is enabled, it is necessary to gate the EXT_CLK to
minimize jitter in the LVPECL output pairs. See the PCB Design
Guidelines for ICS SAW PLLs application note at
www.icst.com/products/appnotes/M000-AN-001.PCBdesign.pdf
STOP Clock
The STOP pin puts the output clock into a static condition.
Logic 1 Output clocks are static
Logic 0 Output clocks enabled for normal operation
M902-01 Datasheet Rev 2.1
3 of 8
Revised 24Jun2004
Integrated Circuit Systems, Inc. ● Networking & Communications ● www.icst.com ● tel (508) 852-5400
M902-01
Integrated
Circuit
Systems, Inc.
VCSO BASED
GB
E CLOCK
G
ENERATOR
P r o d u c t D a t a S h e e t
External Loop Filter
APPLICATION INFORMATION
This section includes information on the optional
external crystal and on the external loop filter.
To provide stable PLL operation, and thereby a low jitter
output clock, the M902-01 requires the use of an
external loop filter. This is provided via the provided
filter pins (see Figure 5).
The subsections on the loop filter provide example
component values and also briefly describe the SAW
PLL simulator tool and additional application
information available at www.icst.com.
RLOOP CLOOP
RPOST
CPOST
CPOST
External Crystal Specifications
If an external crystal is used with the on-chip crystal
oscillator circuit (XTAL OSC), the external crystal
should have the following general specifications:
RLOOP CLOOP
nOP_IN OP_OUT
RPOST
OP_IN
nOP_OUT
nVC
VC
Crystal Specifications
4
9
8
5
6
7
Parameter
Crystal Type
Min Typ Max Unit
AT-cut quartz
Figure 5: External Loop Filter
The loop filter is implemented as a differential circuit
to minimize system noise interference. Due to the
differential signal path design, the implementation
requires two identical complementary RC filters as
shown here. See Table 4, External Loop Filter
Component Values, below.
Fundamental
Mode of Oscillation
Nominal Frequency Range
16
40
f
MHz
ppm
0
1
∆f/f
Frequency Tolerance @
+
25 o
C
±15
±50
±5
0
∆f/fC / TA Frequency Stability -40 to +85 o
C
ppm
1
1
∆f/f / y Aging, per year (first) @
+
25 o
C
ppm
Ω
0
External Loop Filter Component Values
ESR
CS
50
7
Equivalent Series Resistance
Shunt Capacitance
PLLBandwidth Damping R loop C loop R post C post
pF
(kHz)
Factor
(kΩ)
(µF)
(kΩ)
(pF)
Spurious Response (non-harmonic)
-40 dBc
0.5
1.5 1
2.1 2
3.0
3.3
1.1
4.5
4.2
1.5
4.7
4.70
1.00
0.10
0.10
0.03
20
10
10
20
20
150
150
150
270
120
CL
Load Capacitance,
parallel load resonant
16
32
pF
4.7
0.1
1.0
P
Drive Level
mW
0
6.4
20.0
Table 3: External Loop Filter Component Values
3
33.0
10.6
Note 1: These frequency tolerance specifications are suitable for
Table 4: External Loop Filter Component Values
a ±100 ppm clock output frequency requirement.
Note 1: Optimum loop bandwidth when using an external reference
crystal. Will help to attenuate interference on the crystal’s
sinusoidal clock waveform and therefore will minimize
device output clock jitter.
Note 2: Alternative loop filter setting when using an external refer-
ence crystal. Smaller C loop lowers loop damping factor with
negligible increase in output jitter.
The external crystal will be applied to the XTAL_1 / REF_IN
and XTAL_2 input pins. External crystal load capacitors
are also required.
Recommended External Crystal Configuration
Note 3: Optimum loop bandwidth when using an external reference
crystal oscillator. The square wave clock reference does not
require as much jitter attenuation, which allows for a wider
loop bandwidth and improved system noise tolerance.
M902-01
M9xx-0x
XTAL_1 / REF_IN
XTAL_2
C1
C2
Refer to the M902-01 product web page at
www.icst.com/products/summary/m902-01.htm for
additional product information.
XTAL OSC
XTAL
Figure 4: Recommended External Crystal Configuration
XTAL= 25 or 30 MHz, Load Capacitance Specification = 18 pF
C1
C2
=
=
27 pF
33 pF
External load capacitors C1 and C2 present a load of 15 pf
to the crystal (they are seen in series by the crystal through
the common ground connection). With the additional of PCB
trace capacitance and M902-01 input capacitance, the total
load to the crystal is about 18 pf.
M902-01 Datasheet Rev 2.1
4 of 8
Revised 24Jun2004
Integrated Circuit Systems, Inc. ● Networking & Communications ● www.icst.com ● tel (508) 852-5400
M902-01
Integrated
Circuit
VCSO BASED
P r o d u c t D a t a S h e e t
SAW PLL Application Notes Available
GB
E CLOCK
G
ENERATOR
Systems, Inc.
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.
The ICS web site (www.icst.com) also has application
notes on:
• PCB layout guidelines (including special detailed
instructions for preventing issues such as external
reference crosstalk)
• Any new special device application details that may
become available
Refer to the SAW PLL Simulator Software web page at
www.icst.com/products/calculators/m2000filterSWdesc.htm
for additional information.
• Instructions for using PLL simulator software
• Guidelines for PCB fabrication (including recom-
mended PCB footprint, solder mask, and furnace
profile)
Refer to the SAW PLL Application Notes web page at
www.icst.com/products/appnotes/SawPllAppNotes.htm
for application notes and any additional product
information that may become available.
1
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter
Rating
Unit
VI
Input Voltage
-0.5 to VCC +0.5
V
VO
I O
VCC
TS
Output Voltage
-0.5 to VCC +0.5
V
mA
V
25
4.6
Output Current
Power Supply Voltage
Storage Temperature
-45 to +100
oC
Table 5: 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
.
RECOMMENDED CONDITIONS OF OPERATION
Symbol Parameter
Min
Typ
Max Unit
3.135
3.3
3.465
VCC
Positive Supply Voltage
V
TA
Ambient Operating Temperature
oC
oC
0
Commercial
Industrial
+70
+85
-40
Table 6: Recommended Conditions of Operation
M902-01 Datasheet Rev 2.1
5 of 8
Revised 24Jun2004
Integrated Circuit Systems, Inc. ● Networking & Communications ● www.icst.com ● tel (508) 852-5400
M902-01
Integrated
Circuit
Systems, Inc.
VCSO BASED
GB
E CLOCK
G
ENERATOR
P r o d u c t D a t a S h e e t
ELECTRICAL SPECIFICATIONS
DC Characteristics
1
1
Unless stated otherwise, VCC
=
3.3V +
5
%,TA = 0 oC to +70 oC (commercial) , TA = -40 oC to +85 oC (industrial) , Output Frequency=156.25MHz1
,
LVPECL outputs terminated with 50Ωto VCC - 2V
Symbol Parameter
Power Supply VCC Positive Supply Voltage
Min
3.135
Typ
3.3
Max
3.465
Unit
V
300
ICC
Power Supply Current
mA
2
Logic Inputs
VIH
VIL
IIH
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
V
+0.3
V
cc
0.8
150
-0.3
V
EN_EXT_CLK, EXT_CLK,
STOP
µA
µA
V
IIL
-5.0
Reference
Clock
Input
VIH
VIL
IIH
(V / 2 ) +0.5
V +0.3
cc
cc
-0.3
-5.0
(V / 2 ) -0.5 V
cc
XTAL_1 / REF_IN
(XTAL_2 disconnected)
150
µA
µA
IIL
EN_EXT_CLK, EXT_CLK,
Input Capacitance, All Inputs STOP,
XTAL_1 / REF_IN, XTAL_2
All Inputs
Pull-down
CIN
4
pF
R
Internal Pull-down Resistor
Output High Voltage
EN_EXT_CLK, STOP
51
kΩ
V
pulldown
Differential
Output
VOH
VOL
VP-P
V
V
-1.4
-2.0
V
V
-1.0
cc
cc
cc
FOUT, nFOUT (0-1)
Output Low Voltage
-1.7
V
cc
0.5
0.85
Peak to Peak Output Voltage
V
Table 7: DC Characteristics
Note 1: See Ordering Information on pg. 8
AC Characteristics
1
1
Unless stated otherwise, VCC
=
3.3V +
5
%,TA = 0 oC to +70 oC (commercial) , TA = -40 oC to +85 oC (industrial) , Output Frequency=156.25MHz1
,
LVPECL outputs terminated with 50Ωto VCC - 2V
Symbol Parameter
Min
125
Typ
156.25
Max
190
Unit
MHz
Test Conditions
FOUT
Output Frequency Range
25
FIN
Nominal Input Frequency, XTAL_1 / REF_IN
VCSO Pull-Range
MHz
ppm
APR
Φn
±100
±150
Single Side Band
Phase Noise
1kHz Offset
10kHz Offset
100kHz Offset
-90
-110
-135
0.5
dBc/Hz
dBc/Hz
dBc/Hz
ps
@156.25MHz
1.0
55
J(t)
tDC
tR
Jitter (rms)
12kHz to 20MHz
45
50
450
450
Output Duty Cycle, High Time
%
FOUT, nFOUT (0-1)
350
350
550
550
100
200
Output Rise Time
Output Fall Time
Output Skew
ps
ps
ps
MHz
20% to 80%
20% to 80%
FOUT, nFOUT (0-1)
Between Any Pair
EXT_CLK
tF
tS
EXT_CLK Frequency
0
Table 8: AC Characteristics
Note 1: See Ordering Information on pg. 8
M902-01 Datasheet Rev 2.1
6 of 8
Revised 24Jun2004
Integrated Circuit Systems, Inc. ● Networking & Communications ● www.icst.com ● tel (508) 852-5400
M902-01
Integrated
Circuit
Systems, Inc.
VCSO BASED
GB
E CLOCK
G
ENERATOR
P r o d u c t D a t a S h e e t
DEVICE PACKAGE - 9 x 9mm CERAMIC LEADLESS CHIP CARRIER
Mechanical Dimensions:
Refer to the M902-01 product web page at
www.icst.com/products/summary/m902-01.htm
for recommended PCB footprint, solder mask,
furnace profile, and related information.
Figure 6: Device Package - 9 x 9mm Ceramic Leadless Chip Carrier
M902-01 Datasheet Rev 2.1
7 of 8
Revised 24Jun2004
Integrated Circuit Systems, Inc. ● Networking & Communications ● www.icst.com ● tel (508) 852-5400
P r o d u c t D a t a S h e e t
M902-01
Integrated
Circuit
Systems, Inc.
VCSO BASED
GBE CLOCK
G
ENERATOR
ORDERING INFORMATION
Part Numbering Scheme
Example Part Numbers
Output Freq. (MHz) Temperature Order Part Number
Part Number:
M902-01-xxx.xxxx
Device Number
commercial
industrial
M902-01-125.0000
M902-01 125.0000
M902-01-156.2500
M902-01 156.2500
M902-01-187.5000
M902-01 187.5000
Temperature
125.00
156.25
187.50
0
to +70 o
C (commercial)
“I-”==- 40 to +85 o
C
(industrial)
I
commercial
industrial
Output Frequency (MHz)
See Table 9, right. Consult ICS for other frequencies.
I
commercial
Figure 7: Part Numbering Scheme
industrial
I
Table 9: Example Part Numbers
Consult factory for frequency availability.
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS)
assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would
result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial
applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary
environmental requirements are not recommended without additional processing by ICS. ICS reserves the right to change any
circuitry or specifications without notice. ICS does not authorize or warrant any ICS product for use in life support devices or
critical medical instruments.
M902-01 Datasheet Rev 2.1
8 of 8
Revised 24Jun2004
Integrated Circuit Systems, Inc. ● Networking & Communications ● www.icst.com ● tel (508) 852-5400
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