Preliminary Information Integrated Circuit Systems, Inc. M672 VCSO WITH SELECTABLE OUTPUT FREQUENCY DIVIDER FEATURES ◆ Selectable divider chooses one of two output frequencies; the Fvcso or its divided output frequency FOUT 4 5 VCC 6 M672 M672 3 GND 2 P_SEL (Top View) 1 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). nFOUT PIN ASSIGNMENT (5 x 7.5mm SMT) VIN GENERAL DESCRIPTION Figure 1: Pin Assignment Sample of Available Output Frequencies VCSO Center Corresponding Fundamental P Divider1 1 Frequency (MHz) Output Frequency Selections (MHz) 622.0800 4 622.0800, 155.5200 ◆ Differential 3.3V LVPECL output 622.0800 8 622.0800, 77.7600 ◆ Single 3.3V power supply 311.0400 2 311.0400, 155.5200 ◆ Small 5 x 7.5mm SMT (surface mount) package 155.5200 2 155.5200, 77.7600 ◆ Low phase jitter 0.2ps rms typical (50kHz to 80MHz) 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 Revised 07Apr2004 M672 VCSO with Selectable Output Frequency Divider Integrated Circuit Systems, Inc. ● Communications Modules ● w w w. i c s t . c o m ● tel (508) 852-5400 M672 Integrated Circuit Systems, Inc. VCSO WITH SELECTABLE OUTPUT FREQUENCY DIVIDER Preliminary Information PIN DESCRIPTIONS Name VIN I/O P_SEL Input 3 GND Ground 4 5 6 FOUT nFOUT VCC Number 1 2 Configuration Description Input 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 Internal pull-up resistor1 Power supply ground connection. Output No internal terminator Clock output pair. Differential LVPECL. Power 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 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 o +85 C Table 4: Recommended Conditions of Operation PARAMETER MEASUREMENT INFORMATION Output Rise and Fall Time 80% Output Duty Cycle nFOUT 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 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 M672 Integrated Circuit Systems, Inc. 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 180Ω to ground Symbol Parameter Power Supply VCC Pin Positive Supply Voltage VCC Min Typ Max Unit 2.97 3.3 3.63 V 85 125 mA 3.3 V ICC Power Supply Current Control Voltage VIN Input Control Voltage Range P Select Pull-up1 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 Rpullup Internal Pull-up Resistor VOH Output High Voltage VOL Output Low Voltage VP-P Peak to Peak Output Voltage2 IOUT Output Current Differential Outputs 0 VIN VIN Input Impedence kΩ 100 P_SEL µA -150 kΩ 51 Vcc - 0.98 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 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 180Ω to ground Symbol Parameter Min Control Voltage VIN Modulation Bandwidth Output Output Frequency Range FOUT VIN Absolute (Guaranteed) Pull-Range fSTAB Frequency Stability LIN Tuning Linearity KVCO VCO Gain @622.08MHz Max 1 700 ±100 odc Output Duty Cycle 2 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 % -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 tF Output Fall Time 2 for FOUT, nFOUT 275 425 ps Integrated Circuit Systems, Inc. 3 of 4 ● Communications Modules 20% to 80% 20% to 80% Table 6: AC Characteristics 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 VIN = 0.3 to 3.0V Best fit straight line % 400 Non-harmonic Spurious Jitter (rms) @622.08MHz MHz ppm p-p At any givin VIN 6 J(t) Notes ppm 100 SSB (single sideband) Phase Noise, offset from carrier @622.08MHz Unit kHz 500 60 APR Φn Typ Revised 07Apr2004 ● w w w. i c s t . c o m ● tel (508) 852-5400 Integrated Circuit Systems, Inc. M672 Preliminary Information 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: M680-d0 xx M672 Device Number P Divider Value See Table 7 at right for valid “d “ values for particular frequency order codes. Standard Output Frequencies & Order Codes VCSO Center Divided P Order Part # Fundamental Frequency Divider Frequency (MHz) VCSO Output Frequency Order Code See Table 7 at right for valid frequency order codes. Consult ICS for other frequencies and order codes. Figure 6: Part Numbering Scheme 622.0800 155.5200 4 M672-4-AA 622.0800 77.7600 8 M672-8-AA 311.0400 155.5200 2 M672-2-AZ 155.5200 77.7600 2 M672-2-BA 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