Preliminary Information Integrated Circuit Systems, Inc. M685 DUAL SAW, SELECTABLE FREQUENCY VCSO FOUT 4 6 VCC 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). nFOUT PIN ASSIGNMENT (5 x 7.5mm SMT) 5 GENERAL DESCRIPTION M685 M680 3 2 F_SEL GND 1 VIN ( To p Vi ew) Figure 1: Pin Assignment Sample of Available Output Frequencies VCSO Center Frequencies1 (MHz) FEATURES ◆ Two integrated SAW devices and selectable output frequency; supports multi-rate optical interfaces Applications 155.5200, 167.3316 SONET/SDH, SONET/SDH FEC ◆ 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) 156.2500, 161.1328 Gigabit Ethernet, GbE FEC 622.0800, 669.3266 SONET/SDH, SONET/SDH FEC ◆ Industry-standard Kvco for full compatibility 625.0000, 644.5313 Gigabit Ethernet, GbE FEC ◆ Low phase jitter 0.2ps rms typical for the M685-02 (50kHz to 80MHz) Table 1: Sample of Available Output Frequencies Note 1: Specify VCSO center frequencies at time of order ◆ Differential 3.3V LVPECL output ◆ Single 3.3V power supply ◆ Small 5 x 7.5mm SMT (surface mount) package BLOCK DIAGRAM M680 M685 SAW Delay Line VCSO Phase Shifter FOUT VIN nFOUT SAW Delay Line VCSO Phase Shifter F_SEL Figure 2: Block Diagram M685 Datasheet Rev 0.4 Revised 16Nov2004 M685 Dual SAW, Selectable Frequency VCSO Integrated Circuit Systems, Inc. ● Networking & Communications ● w w w. i c s t . c o m ● tel (508) 852-5400 M685 Integrated Circuit Systems, Inc. DUAL SAW, SELECTABLE FREQUENCY VCSO Preliminary Information PIN DESCRIPTIONS Name VIN I/O F_SEL Input 3 GND Ground 4 5 6 FOUT nFOUT VCC Number 1 2 Configuration Description Input Internal pull-down resistor1 Frequency control input. Frequency select: Logic 1 selects Frequency 2. Logic 0 selects Frequency 1. Power supply ground connection. Output No internal terminator Power 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 Inputs -0.5 to VCC +0.5 V VO Outputs -0.5 to VCC +0.5 V VCC Power Supply Voltage 4.6 V TS Storage Temperature -55 to +125 oC 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 VCC TA Positive Supply Voltage Min Typ Max 2.97 3.3 3.63 -40 Ambient Operating Temperature 25 Unit V oC +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 ● tel (508) 852-5400 M685 Integrated Circuit Systems, Inc. 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 180Ω to ground Symbol Parameter Power Supply VCC Pin Positive Supply Voltage VCC Min Typ Max Unit 2.97 3.3 3.63 V 90 125 mA 3.3 V ICC Power Supply Current Control Voltage VIN Input Control Voltage Range Frequency Select1 VIH Input High Voltage 2 Vcc + 0.3 V VIL Input Low Voltage -0.3 0.8 V IIH Input High Current 5 µA IIL Input Low Current 0 VIN VIN Input Impedence F_SEL µA -150 Rpulldown Internal Pull-down Resistor Differential Outputs kΩ 100 kΩ 51 VOH Output High Voltage Vcc - 0.98 VOL Output Low Voltage VP-P Peak to Peak Output Voltage2 IOUT Output Current FOUT, nFOUT Vcc - 0.75 V Vcc - 1.95 0.450 Vcc - 1.63 V 0.625 0.85 V P- P 20 mA Table 5: DC Characteristics for M685-01 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. 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 180Ω to ground Symbol Parameter Min Control Voltage VIN Modulation Bandwidth Output Output Center Frequency Range M685-01 FOUT VIN APR Absolute (Guaranteed) Pull-Range fSTAB Frequency Stability LIN Tuning Linearity KVCO VCO Gain Max 1 125 175 ±120 odc Output Duty Cycle 2 VIN = 0.3 to 3.0V Best fit straight line % 400 ppm/V VIN = 0.3 to 3.0V -77 dBc 100Hz Offset -48 55 dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz ps rms ps rms % @155.52MHz Jitter (rms) @155.52MHz MHz ppm p-p At any givin VIN 6 J(t) Notes ppm 100 SSB (single sideband) Phase Noise, offset from carrier @155.52MHz Unit kHz 600 Non-harmonic Spurious Φn Typ -50 1kHz Offset -75 10kHz Offset -99 100kHz Offset -124 1MHz Offset -142 12kHz to 20MHz 0.30 50kHz to 80MHz 0.18 45 2 tR Output Rise Time for FOUT, nFOUT 275 425 ps 20% to 80% tF Output Fall Time 2 for FOUT, nFOUT 275 425 ps 20% to 80% Note 1: Also fully meets ±50 ppm minimum pull-range specification that is commonly required. Note 2: See Parameter Measurement Information on pg. 5. M685 Datasheet Rev 0.4 Integrated Circuit Systems, Inc. Table 6: AC Characteristics for M685-01 3 of 7 ● Networking & Communications Revised 16Nov2004 ● w w w. i c s t . c o m ● tel (508) 852-5400 M685 Integrated Circuit Systems, Inc. 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 180Ω to ground Symbol Parameter Power Supply VCC Pin Positive Supply Voltage VCC Min Typ Max Unit 2.97 3.3 3.63 V 90 125 mA 3.3 V ICC Power Supply Current Control Voltage VIN Input Control Voltage Range Frequency Select1 VIH Input High Voltage 2 Vcc + 0.3 V VIL Input Low Voltage -0.3 0.8 V IIH Input High Current 5 µA IIL Input Low Current 0 VIN VIN Input Impedence F_SEL µA -150 Rpulldown Internal Pull-down Resistor Differential Outputs kΩ 100 kΩ 51 VOH Output High Voltage Vcc - 0.98 VOL Output Low Voltage VP-P Peak to Peak Output Voltage2 IOUT Output Current FOUT, nFOUT Vcc - 0.75 V Vcc - 1.95 0.450 Vcc - 1.63 V 0.625 0.85 VP-P 20 mA Table 7: DC Characteristics for M685-02 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. 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 180Ω to ground Symbol Parameter Min Control Voltage VIN Modulation Bandwidth Output Output Center Frequency Range M685-02 FOUT VIN APR Absolute (Guaranteed) Pull-Range fSTAB Frequency Stability LIN Tuning Linearity KVCO VCO Gain Max 1 500 700 ±120 SSB (single sideband) Phase Noise, offset from carrier @622.08MHz J(t) Jitter (rms) @622.08MHz odc Output Duty Cycle 2 100Hz Offset 400 ppm/V VIN = 0.3 to 3.0V -77 dBc -42 55 dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz ps rms ps rms % 1kHz Offset -72 -102 100kHz Offset -127 1MHz Offset -146 0.22 50kHz to 80MHz 0.16 45 2 VIN = 0.3 to 3.0V Best fit straight line % 10kHz Offset 12kHz to 20MHz MHz ppm p-p At any givin VIN 6 -50 Notes ppm 100 @622.08MHz Unit kHz 600 Non-harmonic Spurious Φn Typ tR Output Rise Time for FOUT, nFOUT 275 400 ps 20% to 80% tF Output Fall Time 2 for FOUT, nFOUT 275 400 ps 20% to 80% Note 1: Also fully meets ±50 ppm minimum pull-range specification that is commonly required. Note 2: See Parameter Measurement Information on pg. 5. M685 Datasheet Rev 0.4 Integrated Circuit Systems, Inc. Table 8: AC Characteristics for M685-02 4 of 7 ● Networking & Communications Revised 16Nov2004 ● w w w. i c s t . c o m ● tel (508) 852-5400 M685 Integrated Circuit Systems, Inc. DUAL SAW, SELECTABLE FREQUENCY VCSO Preliminary Information PARAMETER MEASUREMENT INFORMATION Output Rise and Fall Time Output Duty Cycle nFOUT 80% 80% VP-P Clock Outputs 20% tF 20% tR FOUT tPW (Output Pulse Width) tPERIOD Figure 3: Output Rise and Fall Time odc = tPW tPERIOD 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. M685 Preliminary Information DUAL SAW, SELECTABLE FREQUENCY VCSO ORDERING INFORMATION M685-01 Standard Output Frequencies & Order Codes Part Numbering Scheme Part Number: M685 M680-01 -0y - xx -xx 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. Figure 6: Part Numbering Scheme 153.6000 BO 167.2820 BF 155.5200 BA 167.3280 BG 156.2500 BB 167.3316 BH 156.8324 BC 167.7097 BI 161.1328 BD 168.0400 BJ 164.3555 BM 172.6423 BK 166.6286 BE 173.3708 BL Table 10: M685-01 Standard Output Frequencies & Order Codes M685-02 Standard Output Frequencies & Order Codes Example Order Numbers For Output Frequencies (MHz) Frequency 1, Frequency 2 155.5200, 167.3316 Order Part Number M685-0y-xx-xx M685-01-BA-BH 614.4000 AO 669.1281 AF 622.0800 AA 669.3120 AG 625.0000 AB 669.3266 AH AC 670.8386 AI AJ 156.2500, 161.1328 M685-01-BB-BD 627.3296 622.0800, 669.3266 M685-02-AA-AH 644.5313 AD 672.1600 M685-02-AB-AD 657.4219 AM 690.5692 AK 666.5143 AE 693.4830 AL 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 Errata Integrated Circuit Systems, Inc. M685 DUAL SAW, SELECTABLE FREQUENCY VCSO PRODUCT APPLICATION CAUTION F_SEL Change During Power-Up Can Affect Output Frequency Accuracy M685E1 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. M685 Datasheet Rev 0.4 - Errata Integrated Circuit Systems, Inc. Revised 16Nov2004 ● Networking & Communications ● w w w. i c s t . c o m ● tel (508) 852-5400