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Integrated Circuit Systems, Inc.
Preliminary Information
M672
VCSO WITH SELECTABLE OUTPUT FREQUENCY DIVIDER
PIN ASSIGNMENT (5 x 7.5mm SMT)
nFOUT FOUT VCC
GENERAL DESCRIPTION
The M672 is a Voltage Controlled SAW Oscillator (VCSO) with a selectable output frequency divider. The output frequency can be pin-selected to be either the VCSO fundamental frequency (Fvcso) or a fraction of Fvcso (1/8, 1/4, or 1/2 depending on frequency and order code). Available center fundamental frequencies for the VCSO are between 125 and 700MHz. Divided Fvcso frequencies are in the 60 to 175MHz range. The M672 SAW (surface acoustic wave) VCO is a high Q frequency source for low-jitter clock generation. It is well suited for phase-locked loop implementations, clock and data recovery circuits, and other timing applications in telecom and optical fiber networking systems (e.g., SONET/SDH).
6
5
M672 M672
(Top View)
1
2
VIN
P_SEL
Figure 1: Pin Assignment
Sample of Available Output Frequencies
VCSO Center Corresponding Fundamental P Divider1 1 (MHz) Frequency 622.0800 622.0800 311.0400 155.5200 4 8 2 2 Output Frequency Selections (MHz) 622.0800, 155.5200 622.0800, 77.7600 311.0400, 155.5200 155.5200, 77.7600
FEATURES
Selectable divider chooses one of two output frequencies; the Fvcso or its divided output frequency Low phase jitter 0.2ps rms typical (50kHz to 80MHz) Differential 3.3V LVPECL output Single 3.3V power supply Small 5 x 7.5mm SMT (surface mount) package
Table 1: Sample of Available Output Frequencies
Note 1: Specify VCSO center frequency and valid corresponding P divider value at time of order. See Ordering Information on pg. 4.
BLOCK DIAGRAM
M672
SAW Delay Line
Phase Shifter
P Divider P=1 (P_SEL=0) or d (P_SEL=1) *
FOUT nFOUT
VIN P_SEL
* The P divider value d (4, 8, or 2) is specified as part of the order number (format is M672-d-xx).
Figure 2: Block Diagram
M672 Datasheet Rev 0.2
M672 VCSO with Selectable Output Frequency Divider
Revised 07Apr2004
Integrated Circuit Systems, Inc.
Communications Modules
w w w. i c s t . c o m
tel (508) 852-5400
GND
3
4
Integrated Circuit Systems, Inc.
M672
VCSO WITH SELECTABLE OUTPUT FREQUENCY DIVIDER
Preliminary Information
PIN DESCRIPTIONS
Number 1 2 3 4 5 6 Name VIN P_SEL GND FOUT nFOUT VCC I/O Configuration Description
Input Input Ground Output Power No internal terminator Internal pull-up resistor1
Frequency control input. P Divider selection: Logic 0 selects P=1, so that Fout = Fvcso. Logic 1 selects P=d, so that Fout = 1/d Fvcso.2 Power supply ground connection. Clock output pair. Differential LVPECL. Power supply connection, connect to +3.3V.
Table 2: Pin Descriptions
Note 1: See "P Select Pull-up" in Table 5, DC Characteristics on pg. 3. Note 2: The P divider value d (4, 8, or 2) is specified as part of the order number. Format is M672-d-xx. See Ordering Information on pg. 4.
ABSOLUTE MAXIMUM RATINGS1
Symbol Parameter Rating Unit
VI VO VCC TS
Inputs Outputs Power Supply Voltage Storage Temperature
-0.5 to VCC +0.5 -0.5 to VCC +0.5
4.6
V V V
oC
-55 to +125
Table 3: 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 2.97 Typ 3.3 25 Max 3.63 Unit
VCC TA
Positive Supply Voltage Ambient Operating Temperature
V
o
-40
+85
C
Table 4: Recommended Conditions of Operation
PARAMETER MEASUREMENT INFORMATION
Output Rise and Fall Time
80% Clock Outputs 20% tR 80% VP-P 20% tF FOUT tPW (Output Pulse Width) tPERIOD odc = tPW tPERIOD
Output Duty Cycle
nFOUT
Figure 3: Output Rise and Fall Time
Figure 4: Output Duty Cycle
M672 Datasheet Rev 0.2 Integrated Circuit Systems, Inc.
2 of 4 Communications Modules
Revised 07Apr2004 w w w. i c s t . c o m
tel (508) 852-5400
Integrated Circuit Systems, Inc.
M672
VCSO WITH SELECTABLE OUTPUT FREQUENCY DIVIDER
Preliminary Information
ELECTRICAL SPECIFICATIONS
DC Characteristics
Unless stated otherwise, VCC = 3.3 Volts + 10%, TA = 0 to 85 oC, Fvcso = 622.08, 311.04, or 155.52 MHz, Outputs terminated into 180 to ground
Symbol Parameter
Pin VCC
Min 2.97
Typ 3.3 85
Max 3.63 125 3.3
Unit
Power Supply VCC ICC Control Voltage P Select Pull-up1 VIN VIH VIL IIH IIL Rpullup Differential Outputs VOH VOL VP-P IOUT
Positive Supply Voltage Power Supply Current Input Control Voltage Range VIN Input Impedence Input High Voltage Input Low Voltage Input High Current Input Low Current Internal Pull-up Resistor Output High Voltage Output Low Voltage Peak to Peak Output Voltage2 Output Current
V mA V k V V A A
VIN
0 100 2
Vcc + 0.3 0.8
-0.3
P_SEL
5 -150
51 Vcc - 0.98
k
Vcc - 0.75 V Vcc - 1.63 V
FOUT, nFOUT
Vcc - 1.95 0.450 0.625
0.85 20
VP-P mA
Table 5: DC Characteristics
Note 1: Internally pulled up to Logic 1 (Fout = 1/d Fvcso) if left unselected. Note 2: Single-ended measurement. See Figure 3, Output Rise and Fall Time, on pg. 2.
AC Characteristics
Unless stated otherwise, VCC = 3.3 Volts + 10%, TA = 0 to 85 oC, Fvcso = 622.08, 311.04, or 155.52 MHz, Outputs terminated into 180 to ground
Symbol Parameter
Min VIN 60
1
Typ 500
Max
Unit
Notes
Control Voltage VIN Output FOUT APR fSTAB LIN KVCO n
Modulation Bandwidth
kHz
700
Output Frequency Range Absolute (Guaranteed) Pull-Range Frequency Stability Tuning Linearity VCO Gain @622.08MHz Non-harmonic Spurious SSB (single sideband) Phase Noise, offset from carrier @622.08MHz
100Hz Offset 1kHz Offset 10kHz Offset 100kHz Offset 1MHz Offset 12kHz to 20MHz 50kHz to 80MHz
MHz ppm ppm p-p At any givin VIN %
VIN = 0.3 to 3.0V Best fit straight line
100
100 6 400 -50 -77 -48 -75 -99 -124 -142 0.30 0.18 45 275 275 55 425 425
ppm/V VIN = 0.3 to 3.0V dBc dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz ps rms ps rms % ps ps
20% to 80% 20% to 80%
Table 6: AC Characteristics
J(t) odc tR tF
Jitter (rms) @622.08MHz Output Duty Cycle 2
2
Output Rise Time for FOUT, nFOUT Output Fall Time 2 for FOUT, nFOUT
Note 1: Also fully meets 50 ppm minimum pull-range specification that is commonly required. Note 2: See Parameter Measurement Information on pg. 2.
M672 Datasheet Rev 0.2 Integrated Circuit Systems, Inc.
3 of 4 Communications Modules
Revised 07Apr2004 w w w. i c s t . c o m
tel (508) 852-5400
Integrated Circuit Systems, Inc.
Preliminary Information
M672
VCSO WITH SELECTABLE OUTPUT FREQUENCY DIVIDER
DEVICE PACKAGE - 5 x 7.5mm SMT (Surface Mount) Package
Mechanical Dimensions:
Dimensions are in mm; dimensions in [ ] are in inches Unless otherwise specified, all dimensions are 0.13 [0.005]
Figure 5: Device Package - 5 x 7.5mm SMT (Surface Mount) Package
ORDERING INFORMATION
Part Numbering Scheme Part Number:
Device Number P Divider Value See Table 7 at right for valid "d " values for particular frequency order codes. VCSO Output Frequency Order Code See Table 7 at right for valid frequency order codes. Consult ICS for other frequencies and order codes.
M680 0 M672-d- xx
Standard Output Frequencies & Order Codes VCSO Center Divided P Order Part # Fundamental Frequency Divider Frequency (MHz) 622.0800 622.0800 311.0400 155.5200 155.5200 77.7600 155.5200 77.7600 4 8 2 2 M672-4-AA M672-8-AA M672-2-AZ M672-2-BA
Figure 6: Part Numbering Scheme
Table 7: Standard Output Frequencies & Order Codes
Consult ICS for the availability of other frequencies
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. M672 Datasheet Rev 0.2 Integrated Circuit Systems, Inc.
4 of 4 Communications Modules
Revised 07Apr2004 w w w. i c s t . c o m
tel (508) 852-5400

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