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Integrated Circuit Systems, Inc.
Preliminary Information
M685
nFOUT
DUAL SAW, SELECTABLE FREQUENCY VCSO
PIN ASSIGNMENT (5 x 7.5mm SMT)
FOUT VCC
GENERAL DESCRIPTION
The M685 is a dual SAW, selectable frequency VCSO frequency source for low-jitter clock generation. An integrated SAW (surface acoustic wave) delay line implements the high-Q VCO (voltage controlled oscillator) function, which results in low output phase noise and very low jitter. The M685-01 is available in a range of center frequencies from 125 to 175 MHz. The M685-02 provides 500 to 700 MHz. Guaranteed minimum pull-range of 120 ppm meets GbE requirements. (It also fully satisfies 50 ppm minimum pull-range specification commonly required.) Industrystandard Kvco (VCO Gain) provides full replacement compatibility. The M685 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., OC-48).
6
5
M685 M680
( To p Vi ew)
1
2
VIN
F_SEL
Figure 1: Pin Assignment
Sample of Available Output Frequencies
VCSO Center Frequencies1 (MHz) 155.5200, 167.3316 156.2500, 161.1328 622.0800, 669.3266 625.0000, 644.5313 Applications SONET/SDH, SONET/SDH FEC Gigabit Ethernet, GbE FEC SONET/SDH, SONET/SDH FEC Gigabit Ethernet, GbE FEC
FEATURES
Two integrated SAW devices and selectable output frequency; supports multi-rate optical interfaces M685-01 output frequencies from 125 to 175 MHz M685-02 output frequencies from 500 to 700 MHz (Specify center frequencies at time of order) Industry-standard Kvco for full compatibility Low phase jitter 0.2ps rms typical for the M685-02 (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 frequencies at time of order
BLOCK DIAGRAM
M680 M685
SAW Delay Line
VCSO
Phase Shifter
VIN
SAW Delay Line
VCSO
Phase Shifter
F_SEL
Figure 2: Block Diagram
M685 Datasheet Rev 0.4
M685 Dual SAW, Selectable Frequency VCSO
Integrated Circuit Systems, Inc.
Networking & Communications
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GND
3
4
FOUT nFOUT
Revised 16Nov2004
Integrated Circuit Systems, Inc.
M685
DUAL SAW, SELECTABLE FREQUENCY VCSO
Preliminary Information
PIN DESCRIPTIONS
Number 1 2 3 4 5 6 Name VIN F_SEL GND FOUT nFOUT VCC I/O Configuration Description
Input Input Ground Output Power No internal terminator Internal pull-down resistor1
Frequency control input. Frequency select: Logic 1 selects Frequency 2. Logic 0 selects Frequency 1. Power supply ground connection. Clock output pair. Differential LVPECL. Power supply connection, connect to +3.3V.
Table 2: Pin Descriptions
Note 1: See "Frequency Select" in Table 5 (DC Characteristics for M685-01 on pg. 3) and Table 7 (DC Characteristics for M685-02 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
oC
-40
+85
Table 4: Recommended Conditions of Operation
M685 Datasheet Rev 0.4 Integrated Circuit Systems, Inc.
2 of 7 Networking & Communications
Revised 16Nov2004 w w w. i c s t . c o m
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Integrated Circuit Systems, Inc.
M685
DUAL SAW, SELECTABLE FREQUENCY VCSO
Preliminary Information
ELECTRICAL SPECIFICATIONS FOR M685-01
DC Characteristics for M685-01
Unless stated otherwise, VCC = 3.3 Volts + 10%, TA = 0 to 85 oC, VCSO Freq.'s = 155.52, 167.3316MHz, Outputs terminated into 180 to ground
Symbol Parameter
Pin VCC
Min 2.97
Typ 3.3 90
Max 3.63 125 3.3
Unit
Power Supply VCC ICC Control Voltage Frequency Select1 VIN VIH VIL IIH IIL
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
V mA V k V V A A
VIN
0 100 2
Vcc + 0.3 0.8
-0.3
F_SEL
5 -150
51 Vcc - 0.98
Rpulldown Internal Pull-down Resistor Differential Outputs VOH VOL VP-P IOUT Output High Voltage Output Low Voltage Peak to Peak Output Voltage2 Output Current
FOUT, nFOUT Vcc - 1.95 0.450
k
Vcc - 0.75 V Vcc - 1.63 V
0.625
0.85 20
VP-P mA
Note 1: Internally pulled down to Logic 0 (Frequency 1) if left unselected. Note 2: Single-ended measurement. See Figure 3, Output Rise and Fall Time, on pg. 5.
Table 5: DC Characteristics for M685-01
AC Characteristics for M685-01
Unless stated otherwise, VCC = 3.3 Volts + 10%, TA = 0 to 85 oC, VCSO Freq.'s = 155.52, 167.3316MHz, Outputs terminated into 180 to ground
Symbol Parameter
Min VIN 125
1
Typ 600
Max
Unit
Notes
Control Voltage VIN Output FOUT APR fSTAB LIN KVCO n
Modulation Bandwidth
kHz
175
Output Center Frequency Range M685-01 Absolute (Guaranteed) Pull-Range Frequency Stability Tuning Linearity VCO Gain Non-harmonic Spurious SSB (single sideband) Phase Noise, offset from carrier @155.52MHz
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
120
100 6
@155.52MHz
-50
400 -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%
J(t) odc tR tF
Jitter (rms) @155.52MHz 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. 5.
Table 6: AC Characteristics for M685-01
M685 Datasheet Rev 0.4 Integrated Circuit Systems, Inc.
3 of 7 Networking & Communications
Revised 16Nov2004 w w w. i c s t . c o m
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Integrated Circuit Systems, Inc.
M685
DUAL SAW, SELECTABLE FREQUENCY VCSO
Preliminary Information
ELECTRICAL SPECIFICATIONS FOR M685-02
DC Characteristics for M685-02
Unless stated otherwise, VCC = 3.3 Volts + 10%, TA = 0 to 85 oC, VCSO Freq.'s = 622.08, 669.3266MHz, Outputs terminated into 180 to ground
Symbol Parameter
Pin VCC
Min 2.97
Typ 3.3 90
Max 3.63 125 3.3
Unit
Power Supply VCC ICC Control Voltage Frequency Select1 VIN VIH VIL IIH IIL
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
V mA V k V V A A
VIN
0 100 2
Vcc + 0.3 0.8
-0.3
F_SEL
5 -150
51 Vcc - 0.98
Rpulldown Internal Pull-down Resistor Differential Outputs VOH VOL VP-P IOUT Output High Voltage Output Low Voltage Peak to Peak Output Voltage2 Output Current
FOUT, nFOUT Vcc - 1.95 0.450
k
Vcc - 0.75 V Vcc - 1.63 V
0.625
0.85 20
VP-P mA
Note 1: Internally pulled down to Logic 0 (Frequency 1) if left unselected. Note 2: Single-ended measurement. See Figure 3, Output Rise and Fall Time, on pg. 5.
Table 7: DC Characteristics for M685-02
AC Characteristics for M685-02
Unless stated otherwise, VCC = 3.3 Volts + 10%, TA = 0 to 85 oC, VCSO Freq.'s = 622.08, 669.3266MHz, Outputs terminated into 180 to ground
Symbol Parameter
Min VIN 500
1
Typ 600
Max
Unit
Notes
Control Voltage VIN Output FOUT APR fSTAB LIN KVCO n
Modulation Bandwidth
kHz
700
Output Center Frequency Range M685-02 Absolute (Guaranteed) Pull-Range Frequency Stability Tuning Linearity VCO Gain 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
120
100 6
@622.08MHz
-50
400 -77 -42 -72 -102 -127 -146 0.22 0.16 45 275 275 55 400 400
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%
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. 5.
Table 8: AC Characteristics for M685-02
M685 Datasheet Rev 0.4 Integrated Circuit Systems, Inc.
4 of 7 Networking & Communications
Revised 16Nov2004 w w w. i c s t . c o m
tel (508) 852-5400
Integrated Circuit Systems, Inc.
M685
DUAL SAW, SELECTABLE FREQUENCY VCSO
Preliminary Information
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
DEVICE PACKAGE - 5 x 7.5mm SMT (Surface Mount) Package
Mechanical Dimensions:
ICSM685 -02-AA-AH
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
M685 Datasheet Rev 0.4 Integrated Circuit Systems, Inc.
5 of 7 Networking & Communications
Revised 16Nov2004 w w w. i c s t . c o m
tel (508) 852-5400
Integrated Circuit Systems, Inc.
Preliminary Information
M685
DUAL SAW, SELECTABLE FREQUENCY VCSO
ORDERING INFORMATION
Part Numbering Scheme Part Number:
Device Number Variant -01 = Output Frequencies 125 - 175 MHz -02 = Output Frequencies 500 - 700 MHz Output Frequency 1 Order Code Output Frequency 2 Order Code See Tables 10 and 11 at right for frequency order codes. Consult ICS for other frequencies and order codes.
M685-01 Standard Output Frequencies & Order Codes
M680-01 M685 -0y - xx -xx
153.6000 155.5200 156.2500 156.8324 161.1328 164.3555 166.6286
BO BA BB BC BD BM BE
167.2820 167.3280 167.3316 167.7097 168.0400 172.6423 173.3708
BF BG BH BI BJ BK BL
Figure 6: Part Numbering Scheme
Table 10: M685-01 Standard Output Frequencies & Order Codes
Example Order Numbers For Output Frequencies (MHz)
M685-02 Standard Output Frequencies & Order Codes Order Part Number M685-0y-xx-xx M685-01-BA-BH M685-01-BB-BD M685-02-AA-AH M685-02-AB-AD 614.4000 622.0800 625.0000 627.3296 644.5313 657.4219 666.5143
AO AA AB AC AD AM AE
669.1281 669.3120 669.3266 670.8386 672.1600 690.5692 693.4830
AF AG AH AI AJ AK AL
Frequency 1, Frequency 2
155.5200, 167.3316 156.2500, 161.1328 622.0800, 669.3266 625.0000, 644.5313
Table 9: Example Order Numbers
Table 11: M685-02 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. M685 Datasheet Rev 0.4 Integrated Circuit Systems, Inc.
6 of 7 Networking & Communications
Revised 16Nov2004 w w w. i c s t . c o m
tel (508) 852-5400
Integrated Circuit Systems, Inc.
Errata
M685
DUAL SAW, SELECTABLE FREQUENCY VCSO
PRODUCT APPLICATION CAUTION
F_SEL Change During Power-Up Can Affect Output Frequency Accuracy The M685 features an F_SEL input which is used to select the internal VCSO frequency. The F_SEL input logic level should not be changed while the M685 device is in operation (that is, voltage is applied to the pin VCC), particularly when the pin VIN (the control voltage input) is above 2.0V. Changing the F_SEL input logic level during operation may result in an erroneous output frequency. It is safe to change F_SEL during operation if pin VIN can be held low, or at least below 2.0V.
M685E1
M685 Datasheet Rev 0.4 - Errata Integrated Circuit Systems, Inc.
Revised 16Nov2004 Networking & Communications
w w w. i c s t . c o m
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