M906-01-125.0000 [IDT]
CLCC-36, Tube;
| 型号： | M906-01-125.0000 |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | CLCC-36, Tube |
| 文件： | 总8页 (文件大小：352K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
P r o d u c t D a t a S h e e t
Integrated
Circuit
Systems, Inc.
M906-01
VCSO BASED GBE CLOCK GENERATOR
GENERAL DESCRIPTION
PIN ASSIGNMENT (9 x 9 mm SMT)
The M906-01 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 six
XTAL_2
FOUT4
nFOUT4
FOUT5
nFOUT5
VCC
nFOUT2
FOUT2
nFOUT1
FOUT1
GND
nFOUT0
FOUT0
VCC
28
29
18
17
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.
30
31
32
33
34
35
36
16
15
14
13
12
11
10
M906-01
( T o p V i e w )
DNC
DNC
DNC
GND
FEATURES
◆ Output clock frequency from 125MHz to 190MHz
(Consult factory for frequency availability)
Figure 1: Pin Assignment
◆ Six identical LVPECL output pairs
◆ Integrated SAW (surface acoustic wave) delay line
◆ Low jitter 0.7ps 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
Ratio
Application
◆ 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
GbE
25/4
156.25
187.50
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
◆ Pb-free design/construction on all 9 x 9 mm modules
SIMPLIFIED BLOCK DIAGRAM
M906-01-156.25
VSCO
External
Crystal
LVPECL
Output
Clock Pairs
(e.g., 156.25
Frequency
Multiplying
PLL
XTAL
OSC
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
M906-01 Datasheet Rev 3.2
Revised 15Jun2006
M906-01 VCSO Based GbE Clock Generator
Integrated Circuit Systems, Inc. ● Communications Modules ● www.icst.com ● tel (508) 852-5400
M906-01
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
M906-01
OP_IN
RIN
nOP_OUT
nVC
VC
FOUT5
Phase
Detector
SAW Delay Line
nFOUT5
XTAL_1 / REF_IN
XTAL
OSC
R Divider
R = 4
FOUT4
XTAL_2
nFOUT4
RIN
Loop Filter
Amplifier
Phase
Shifter
FOUT3
VCSO
nFOUT3
M Divider
M = 25
O
1
FOUT2
nFOUT2
Phase Locked Loop (PLL)
EXT_CLK
FOUT1
nFOUT1
EN_EXT_CLK
FOUT0
nFOUT0
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 Clock Feed-through, on pg. 3.
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
15
16
FOUT1
nFOUT1
17
18
FOUT2
nFOUT2
Clock output pairs, differential LVPECL output
(156.25 MHz for the M906-01-156.2500)
Output
No internal terminator
20
21
FOUT3
nFOUT3
29
30
FOUT4
nFOUT4
31
32
FOUT5
nFOUT5
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.
M906-01 Datasheet Rev 3.2
2 of 8
Revised 15Jun2006
Integrated Circuit Systems, Inc. ● Communications Modules ● www.icst.com ● tel (508) 852-5400
M906-01
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 M906-01 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 M906-01 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. This creates an output
frequency that is a multiple of the reference frequency
(which is output from the VCSO).
The input reference can either be an external, discrete
crystal device or a stable external clock source such as
a packaged crystal oscillator:
• 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 capacitors are also
required.
The relationship between the VCSO output frequency,
the M Divider, the R Divider and the input reference
frequency is defined as follows:
M
R
----
Fvcso = Fxtal ×
• If an external LVCMOS/LVTTL clock source is used,
apply it to the XTAL_1 / REF_IN input pin.
For the M906-01-156.2500 (see “Ordering Information” on pg. 8):
In either case, the reference clock is supplied to the
phase detector of the PLL. The M906-01 includes a
reference divider that divides the input reference
frequency by a fixed value “R” and provides the result to
the phase detector.
• VCSO output frequency = 156.25MHz
• Input reference frequency = 25MHz
• M=25
• R= 4
Therefore, for the M906-01-156.2500:
The EX_CLK pin is available for a clock feed-through
mode for testing. See “External Clock Feed-through”
on pg. 3.
25
---------
4
156.25MHz = 25MHz
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. It can be used for system debugging and
performance evaluation.
1. Set pin EN_EXT_CLK to Logic 1.
2. Apply an external LVCMOS/LVTTL clock source
to the EXT_CLK input pin.
Due to the fact that EXT_CLK bypasses the PLL, any
frequency between DC and 200MHz can be used.
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
M906-01 Datasheet Rev 3.2
3 of 8
Revised 15Jun2006
Integrated Circuit Systems, Inc. ● Communications Modules ● www.icst.com ● tel (508) 852-5400
M906-01
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
To provide stable PLL operation, and thereby a low jitter
output clock, the M906-01 requires the use of an
external loop filter. This is provided via the provided
filter pins (see Figure 5).
This section includes information on the optional
external crystal and on the external loop filter.
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.
Due to the differential signal path design, the
implementation requires two identical complementary
RC filters as shown here.
External Crystal Specifications
RLOOP CLOOP
RPOST
If an external crystal is used with the on-chip crystal
oscillator circuit (XTAL OSC), the external crystal
should have the following general specifications:
CPOST
CPOST
Crystal Specifications
RLOOP CLOOP
nOP_IN OP_OUT
RPOST
Parameter
Min Typ Max Unit
AT-cut quartz
Crystal Type
OP_IN
nOP_OUT
nVC
VC
Fundamental
4
9
8
5
6
7
Mode of Oscillation
Frequency Range
Equivalent Series Resistance
16
40
50
f
MHz
Figure 5: External Clock Feed-through
0
ESR
Ω
Example External Loop Filter Component Values
Spurious Response (non-harmonic)
-40 dBc
C
post
(pF)
Load Capacitance,
16
CL
PLL Band- Damping R loop C loop R post
32
pF
parallel load resonant
width (kHz) Factor
(kΩ)
(µF)
(kΩ)
0.1
1.0
P
Drive Level
mW
0
Table 3: Crystal Specifications
0.5
3.0
3.3
1.1
4.5
4.2
1.5
4.7
4.70
1.00
20
10
10
20
20
1500
1500
1500
270
1.5 1
2.1 2
The external crystal will be applied to the XTAL_1 / REF_IN
and XTAL_2 input pins. External crystal load capacitors
are also required.
4.7
0.10
6.4
20.0
33.0
0.10
Recommended External Crystal Configuration
3
10.6
0.033
120
M906-01
M
Table 4: Example External Loop Filter Component Values
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 reference
crystal. Smaller C loop lowers loop damping factor with negli-
gible increase in output jitter.
XTAL_1 / REF_IN
XTAL_2
C1
C2
XTAL OSC
XTAL
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.
Figure 4: Recommended External Crystal Configuration
XTAL= 25 or 30 MHz, Load Capacitance Specification = 18 pF
Refer to the M906-01 product web page at
www.icst.com/products/summary/m906-01.htm for
additional product information.
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 M906-01 input capacitance, the total
load to the crystal is about 18 pf.
M906-01 Datasheet Rev 3.2
4 of 8
Revised 15Jun2006
Integrated Circuit Systems, Inc. ● Communications Modules ● www.icst.com ● tel (508) 852-5400
M906-01
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 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
• Instructions for using PLL simulator software
Refer to the SAW PLL Simulator Software web page at
www.icst.com/products/calculators/m2000filterSWdesc.htm
for additional information.
• Guidelines for PCB fabrication (inc. recommended
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
Output Current
22
4.6
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
M906-01 Datasheet Rev 3.2
5 of 8
Revised 15Jun2006
Integrated Circuit Systems, Inc. ● Communications Modules ● www.icst.com ● tel (508) 852-5400
M906-01
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 50
Ω to VCC - 2V
Symbol Parameter
Power Supply VCC Positive Supply Voltage
Min
3.135
Typ
3.3
Max
3.465
Unit
V
ICC
Power Supply Current
350
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
4
µA
µA
IIL
EN_EXT_CLK, EXT_CLK,
STOP, XTAL_1 / REF_IN
All Inputs
Pull-down
CIN
R
Input Capacitance, All Inputs
pF
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 (0-5)
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 50
Ω to 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
0.7
dBc/Hz
dBc/Hz
dBc/Hz
ps
@156.25MHz
1.0
55
J(t)
tDC
tR
Jitter (rms)
12kHz to 20MHz
45
50
Output Duty Cycle, High Time
%
FOUT, nFOUT (0-1)
350
350
450
450
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
0
EXT_CLK Frequency
Table 8: AC Characteristics
M906-01 Datasheet Rev 3.2
6 of 8
Revised 15Jun2006
Integrated Circuit Systems, Inc. ● Communications Modules ● www.icst.com ● tel (508) 852-5400
M906-01
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
Note 1: See Ordering Information on pg. 8
DEVICE PACKAGE - 9 x 9mm CERAMIC LEADLESS CHIP CARRIER
Mechanical Dimensions:
Refer to the SAW PLL application notes web page at
www.icst.com/products/appnotes/SawPllAppNotes.htm
for application notes, including recommended PCB
footprint, solder mask, and furnace profile.
Figure 6: Device Package - 9 x 9mm Ceramic Leadless Chip Carrier
M906-01 Datasheet Rev 3.2
7 of 8
Revised 15Jun2006
Integrated Circuit Systems, Inc. ● Communications Modules ● www.icst.com ● tel (508) 852-5400
P r o d u c t D a t a S h e e t
M906-01
G
Integrated
Circuit
Systems, Inc.
VCSO BASED
GB
E CLOCK
ENERATOR
ORDERING INFORMATION
Part Numbering Scheme
Example Part Numbers
Output Freq. (MHz) Temperature Order Part Number
Part Number:
Device Number
M906-01-xxx.xxxx
commercial
industrial
M906-01-156.2500
M906-01 156.2500
M906-01-156.2500
M906-01 156.2500
M906-01-187.5000
M906-01 187.5000
Temperature
156.25
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 8, right. Consult ICS for other frequencies.
I
commercial
Figure 7: Part Numbering Scheme
industrial
I
Table 9: Example Part Numbers
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.
M906-01 Datasheet Rev 3.2
8 of 8
Revised 15Jun2006
Integrated Circuit Systems, Inc. ● Communications Modules ● www.icst.com ● tel (508) 852-5400
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