M908-01I125.0000LF [IDT]
Clock Generator, 125MHz, CQCC36, 9 X 9 MM, CERAMIC, LCC-36;
| 型号： | M908-01I125.0000LF |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | Clock Generator, 125MHz, CQCC36, 9 X 9 MM, CERAMIC, LCC-36 |
| 文件： | 总6页 (文件大小：293K) |
| 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.
M908-01
VCSO BASED GBE CLOCK GENERATOR
GENERAL DESCRIPTION
PIN ASSIGNMENT (9 x 9 mm SMT)
The M908-01 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 eight
XTAL_2
FOUT6
nFOUT6
FOUT7
nFOUT7
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
M908-01
( 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
◆ Eight 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
Application
Ratio
20
25
30
125.00
156.25
187.50
GbE
◆ External XTAL or LVCMOS reference input
◆ Industrial temperature grade available
◆ Single 3.3V power supply
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
M908-01
FOUT7
nFOUT7
VSCO
FOUT6
nFOUT6
FOUT5
nFOUT5
External
Crystal
or
Reference
Clock Input
(e.g., 25 or 30 MHz)
Frequency
Multiplying
PLL
LVPECL
Output
Clock Pairs
(e.g., 156.25
XTAL
OSC
FOUT4
nFOUT4
Divider
FOUT3
nFOUT3
or 187.50MHz)
FOUT2
nFOUT2
FOUT1
nFOUT1
FOUT0
nFOUT0
External Loop Filter
Figure 2: Simplified Block Diagram
M908-01 Datasheet Rev 2.1
Revised 30Jul2004
M908-01 VCSO Based GbE Clock Generator
Integrated Circuit Systems, Inc. ● Communications Modules ● www.icst.com ● tel (508) 852-5400
M908-01
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
M908-01
OP_IN
RIN
nOP_OUT
nVC
VC
Phase
Detector
FOUT7
SAW Delay Line
XTAL_1 / REF_IN
nFOUT7
XTAL
OSC
R Divider
R = 4
FOUT6
nFOUT6
XTAL_2
RIN
Loop Filter
Amplifier
Phase
Shifter
FOUT5
VCSO
nFOUT5
M Divider
M = 25
FOUT4
nFOUT4
Phase Locked Loop (PLL)
FOUT3
nFOUT3
FOUT2
nFOUT2
FOUT1
nFOUT1
FOUT0
nFOUT0
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
15
16
FOUT1
nFOUT1
17
18
FOUT2
nFOUT2
20
21
FOUT3
nFOUT3
Output
No internal terminator
Clock output pairs, differential LVPECL output
(156.25 MHz for the M908-01-156.2500)
22
23
FOUT4
nFOUT4
24
25
FOUT5
nFOUT5
29
30
FOUT6
nFOUT6
31
32
FOUT7
nFOUT7
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
M908-01 Datasheet Rev 2.1
2 of 6
Revised 30Jul2004
Integrated Circuit Systems, Inc. ● Communications Modules ● www.icst.com ● tel (508) 852-5400
M908-01
Integrated
Circuit
VCSO BASED
P r o d u c t D a t a S h e e t
Therefore, for the M908-01-156.2500:
G
B
E CLOCK
GENERATOR
Systems, Inc.
FUNCTIONAL DESCRIPTION
The M908-01 is a PLL (Phase Locked Loop) based
clock generator that generates output clocks
synchronized to an input reference clock.
25
---------
156.25MHz = 25MHz
4
M
----
The product of the input crystal frequency and
falls within the lock range of the VCSO.
R
The M908-01 combines the flexibility of a VCSO
(Voltage Controlled SAW Oscillator) with the stability of
a crystal oscillator.
APPLICATION INFORMATION
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.
Input Reference
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.
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:
• If an external LVCMOS/LVTTL clock source is used,
Crystal Specifications
apply it to the XTAL_1 / REF_IN input pin.
Parameter
Crystal Type
Min Typ Max Unit
AT-cut quartz
In either case, the reference clock is supplied to the
phase detector of the PLL. The M908-01 includes a
reference divider that divides the input reference
frequency by a fixed value “R” and provides the result to
the phase detector.
Fundamental
Mode of Oscillation
Frequency Range
Equivalent Series Resistance
16
40
50
f
MHz
0
ESR
Ω
Spurious Response (non-harmonic)
-40 dBc
The PLL
Load Capacitance,
16
CL
The PLL (Phase Locked Loop) includes the phase
detector, the VCSO, a feedback divider (labeled
“M Divider”), and a reference divider (“R Divider”).
32
pF
parallel load resonant
0.1
1.0
P
Drive Level
mW
0
Table 3: Crystal Specifications
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 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
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).
M908-01
M9xx-0x
XTAL_1 / REF_IN
XTAL_2
C1
C2
XTAL OSC
XTAL
The relationship between the VCSO output frequency,
the M Divider, the R Divider and the input reference
frequency is defined as follows:
M
R
Figure 4: Recommended External Crystal Configuration
XTAL= 25 or 30 MHz, Load Capacitance Specification = 18 pF
----
Fvcso = Fxtal ×
For the M908-01-156.2500 (see “Ordering Information” on pg. 6):
C1
C2
=
=
27 pF
33 pF
• VCSO output frequency = 156.25MHz
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 M908-01 input capacitance, the total
load to the crystal is about 18 pf.
• Input reference frequency = 25MHz
• M=25
• R= 4
M908-01 Datasheet Rev 2.1
3 of 6
Revised 30Jul2004
Integrated Circuit Systems, Inc. ● Communications Modules ● www.icst.com ● tel (508) 852-5400
M908-01
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
External Loop Filter Component Values
To provide stable PLL operation, and thereby a low jitter
output clock, the M908-01 requires the use of an
external loop filter. This is provided via the provided
filter pins (see Figure 5).
PLL Band- Damping R loop
C loop R post C post
width (kHz) Factor
(kΩ)
(µF)
(kΩ)
(pF)
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
Due to the differential signal path design, the
implementation requires two identical complementary
RC filters as shown here.
4.7
0.10
6.4
20.0
0.10
RLOOP CLOOP
RPOST
3
10.6
33.0
0.033
120
Table 4: External Loop Filter Component Values
CPOST
CPOST
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.
RLOOP CLOOP
nOP_IN OP_OUT
RPOST
Note 2: Alternative loop filter setting when using an external reference
crystal. Smaller C loop lowers loop damping factor with negligi-
ble increase in output jitter.
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.
OP_IN
nOP_OUT
nVC
VC
4
9
8
5
6
7
Figure 5: External Loop Filter
Refer to the M908-01 product web page at
www.icst.com/products/summary/m908-01.htm for
additional product information.
1
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter
Rating
Unit
VI
Input Voltage
Output Voltage
Output Current
-0.5 to VCC +0.5
V
VO
I O
VCC
TS
-0.5 to VCC +0.5
V
mA
V
21
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
VCC
Positive Supply Voltage
3.135
3.3
3.465
V
TA
Ambient Operating Temperature
oC
oC
0
Commercial
Industrial
+70
+85
-40
Table 6: Recommended Conditions of Operation
M908-01 Datasheet Rev 2.1
4 of 6
Revised 30Jul2004
Integrated Circuit Systems, Inc. ● Communications Modules ● www.icst.com ● tel (508) 852-5400
M908-01
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 50Ω to VCC - 2V
Symbol Parameter
Power Supply VCC Positive Supply Voltage
Min
3.135
Typ
3.3
Max
3.465
Unit
V
375
ICC
VIH
VIL
IIH
Power Supply Current
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
mA
V
Reference
Clock
Input
(V / 2) +0.5
V +0.3
cc
cc
-0.3
(V / 2 ) -0.5 V
cc
XTAL_1 / REF_IN
(XTAL_2 disconnected)
150
µA
µA
IIL
-5.0
Crystal or
Reference
Clock Input
4
CIN
Input Capacitance
XTAL_1 / REF_IN
FOUT, nFOUT (0-7)
pF
Differential
Output
VOH
VOL
VP-P
Output High Voltage
V
V
-1.4
-2.0
V
V
-1.0
V
V
V
cc
cc
cc
Output Low Voltage
-1.7
cc
0.5
0.85
Peak to Peak Output Voltage
Table 7: DC Characteristics
Note 1: See Ordering Information on pg. 6
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 50Ω 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 (0-7)
350
350
450
450
550
550
100
Output Rise Time
Output Fall Time
Output Skew
ps
ps
ps
20% to 80%
20% to 80%
FOUT, nFOUT (0-7)
Between Any Pair
tF
tS
Table 8: AC Characteristics
Note 1: See Ordering Information on pg. 6
M908-01 Datasheet Rev 2.1
5 of 6
Revised 30Jul2004
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
M908-01
Integrated
Circuit
Systems, Inc.
VCSO BASED
GBE CLOCK
G
ENERATOR
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
ORDERING INFORMATION
Part Numbering Scheme
Example Part Numbers
Output Freq. (MHz) Temperature Order Part Number
Part Number:
M908-01-xxx.xxxx
Device Number
commercial
industrial
M908-01-125.0000
M908-01 125.0000
M908-01-156.2500
M908-01 156.2500
M908-01-187.5000
M908-01 187.5000
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 8, right. Consult ICS for other frequencies.
I
commercial
industrial
Figure 7: Part Numbering Scheme
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.
M908-01 Datasheet Rev 2.1
6 of 6
Revised 30Jul2004
Integrated Circuit Systems, Inc. ● Communications Modules ● www.icst.com ● tel (508) 852-5400
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