LOW POWER SPREAD SPECTRUM OSCILLATOR
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1 LOW POWER SPREAD SPECTRUM OSCILLATOR SERIES LPSSO WITH SPREAD-OFF FUNCTION MHz FEATURES + 100% pin-to-pin drop-in replacement to quartz and MEMS based XO + Low Power Spread Spectrum Oscillator for Low Cost + Spread-off function on Pin1 up to 50 MHz + Excellent long time reliability - outperforms quartz-based XO + LVCMOS/LVTTL compatible output + Standby current as low as 0.4 µa + Fast resume time of 3 ms (typ) + <30 ps cycle-to-cycle jitter + Spread options (contact Petermann-Technik for other spread options) Center spread: ±0.50%, ±0.25% (standard) Down spread: -1%, -0.5% (standard) + Outstanding mechanical robustness for portable applications + Express samples within 1 day ex works + Pb-free, RoHS and REACH compliant / MSL1@260 C APPLICATIONS + Printers + Flat panel drivers + PCI + MCU + USB PCI or PCI Express + Low Power MCU + Industrial + Telecom + Commercial + Medical GENERAL DATA PARAMETER AND CONDITIONS SYMBOL MIN. TYP. MAX. UNIT CONDITION FREQUENCY RANGE Output Frequency Range f MHz FREQUENCY STABILITY AND AGING Frequency Tolerance F_tol PPM Inclusive of: Initial stability, operating temperature, rated power, supply voltage change, load change, shock & vibration PPM Spread Off Aging Ag -1 1 PPM 1st year at 25 C OPERATING TEMPERATURE RANGE Operating Temperature Range T_use C Extended Commercial C Industrial Storage Temperature Range T_stor C Storage SUPPLY VOLTAGE AND CURRENT CONSUMPTION Supply Voltage VDD V V V V Current Consumption IDD ma No load condition, f = 20 MHz, VDD= 2.5V, 2.8V, or 3.3V ma No load condition, f = 20 MHz, VDD = 1.8V Standby Current I_std µa ST = GND, VDD = 3.3V, output is pulled down LVCMOS OUTPUT CHARACTERISTICS µa ST = GND, VDD= 2.5V or 2.8V, output is pulled down µa ST = GND, VDD = 1.8V, output is pulled down Duty Cycle DC % All VDDs. f 70 MHz % All VDDs. f >70 MHz Rise/Fall Time Tr, Tf 1 2 ns 20% - 80% VDD = 2.5V, 2.8V or 3.3V, 15 pf load ns 20% - 80% VDD =1.8V, 15 pf load PAGE 1 OF 8 I SPEC 01 I REV.00 I OKTOBER 2014
2 GENERAL DATA (continued) PARAMETER AND CONDITIONS SYMBOL MIN. TYP. MAX. UNIT CONDITION LVCMOS OUTPUT CHARACTERISTICS Output High Voltage VOH 90% VDD IOH = -4 ma (VDD = 3.3V) IOH = -3 ma (VDD = 2.8V and VDD= 2.5V) IOH = -2 ma (VDD= 1.8V) Output Low Voltage VOL 10% VDD IOL = -4 ma (VDD = 3.3V) IOL = -3 ma (VDD= 2.8V and VDD = 2.5V) IOL = -2 ma (VDD = 1.8V) Output Load Ld 15 pf At maximum frequency and supply voltage. Contact Petermann-Technik for higher output load option. INPUT CHARACTERISTICS Input High Voltage VIH 70% VDD Pin 1, OE or ST or SD Input Low Voltage VIL 30% VDD Pin 1, OE or ST or SD STARTUP AND RESUME TIMING Startup Time T_start 10 ms Measured from the time VDD reaches its rated minimum value Resume Time T_resume ms Measured from the time ST pin crosses 50% threshold JITTER Cycle-to-Cycle Jitter T_cyc 26 ps f = 50 MHz, Spread = ON EXCELLENT RELIABILITY DATA 26 ps f = 50 MHz, Spread = OFF MTBF Shock Resistance Vibration Resistance 500 million hours g 70 g SPREAD SPECTRUM MODES [1] CENTER SPREAD DOWN SPREAD CODE A B C D PERCENTAGE ±0.25% ±0.50% [2] -0.5% -1.0% [3] Note: 1. In both center spread and down spread modes, triangle modulation is employed with a frequency of ~32 khz. 2.±0.5% and -1.0% are available ONLY for <75 MHz in extended commercial temperature range. PIN DESCRIPTION TOP VIEW PIN SYMBOL FUNCTIONALITY Standby (ST) H or Open [4] : specified frequency output. L: output is low (weak pull down). Oscillator stops. ST/OE/SD 1 4 VDD 1 ST/OE/SD Output Enable (OE) H or Open [4] : specified frequency output. L: output is high impedance. Spread Disable (SD) H or Open: Spread=ON L: Spread=OFF (DOWN SPREAD ONLY) GND 2 3 OUT 2 GND Ground Connect to ground 3 OUT Output Clock output 4 VDD Power Supply Note: 3. In 1.8 V mode, a resistor of <10 kω between OE pin and VDD is recommended. PAGE 2 OF 8 I SPEC 01 I REV.00 I OKTOBER 2014
3 Harmonic amplitude (db) PETERMANN-TECHNIK GmbH TIMING DIAGRAMS FIGURE 1. STARTUP TIMING (OE/ST MODE) FIGURE 2. STANDBY RESUME TIMING (ST MODE ONLY) 90%VDD, 2.5/2.8/3.3V parts 95%VDD, 1.8V parts VDD Pin 4 Voltage 50%VDD VDD ST Voltage T_start T_resume CLK Output CLK Output T_start: Time to start from power-off (ST/OE Mode) T_resume: Time to resume from ST (ST Mode only) PROGRAMMABLE DRIVE STRENGTH The LPSSO includes a programmable drive strength feature to provide a simple, flexible tool to optimize the clock rise/fall time for specific applications. Benefits from the programmable drive strength feature are: + Improves system radiated electromagnetic interference (EMI) by slowing down the clock rise/fall time + Improves the downstream clock receiver s (RX) jitter by decreasing (speeding up) the clock rise/fall time. + Ability to drive large capacitive loads while maintaining full swing with sharp edge rates. For more detailed information about rise/fall time control and drive strength selection, see the Petermann-Technik Applications Note section: EMI REDUCTION BY SLOWING RISE/FALL TIME FIGURE 3. HARMONIC EMI REDUCTION AS A FUNCTION OF SLOWER RISE/FALL TIME Harmonic number trise=0.05 trise=0.1 trise=0.15 trise=0.2 trise=0.25 trise=3 trise=0.35 trise=0.4 trise=0.45 Figure 3 shows the harmonic power reduction as the rise/fall times are increased (slowed down). The rise/fall times are expressed as a ratio of the clock period. For the ratio of 0.05, the signal is very close to a square wave. For the ratio of 0.45, the rise/fall times are very close to near-triangular waveform. These results, for example, show that the 11th clock harmonic can be reduced by 35 db if the rise/fall edge is increased from 5% of the period to 45% of the period. HIGH OUTPUT LOAD CAPABILITY The rise/fall time of the input clock varies as a function of the actual capacitive load the clock drives. At any given drive strength, the rise/ fall time becomes slower as the output load increases. As an example, for a 3.3V LPSSO device with default drive strength setting, the typical rise/fall time is 1ns for 15 pf output load. The typical rise/fall time slows down to 2.6ns when the output load increases to 45 pf. One can choose to speed up the rise/fall time to 1.68ns by then increasing the drive strength setting on the LPSSO. The LPSSO can support up to 60 pf or higher in maximum capacitive loads with up to 3 additional drive strength settings. Refer to the Rise/Tall Time Tables to determine the proper drive strength for the desired combination of output load vs. rise/fall time. LPSSO DRIVE STRENGTH SELECTION Tables 1 through 4 define the rise/fall time for a given capacitive load and supply voltage. 1. Select the table that matches the LPSSO nominal supply voltage (1.8V, 2.5V, 2.8V, 3.3V). 2. Select the capacitive load column that matches the application requirement (15 pf to 60 pf) 3. Under the capacitive load column, select the desired rise/fall times. 4. The left-most column represents the part number code for the corresponding drive strength. 5. Add the drive strength code to the part number for PAGE 3 OF 8 I SPEC 01 I REV.00 I OKTOBER 2014
4 PROGRAMMABLE DRIVE STRENGTH (continued) CALCULATING MAXIMUM FREQUENCY Based on the rise and fall time data given in Tables 1 through 4, the maximum frequency the oscillator can operate with guaranteed full swing of the output voltage over temperature as follows: Calculate fmax for the following condition: + VDD = 3.3V (Table 1) + Capacitive Load: 30pF + Desired Tr/f time = 1.6ns (rise/fall time part number code=z) EXAMPLE 1 Max. frequency = 1 5 x Trf_20/80 Part number for the above example: LPSSO E-50-M MHZ-T-S-A Drive strength code is inserted here. Standard setting is S RISE/FALL TIME (20% TO 80%) vs CLOAD [4] TABLE 1. RISE/FALL TIMES, VDD = 1.8V ±5%, T = 40 C TO 85 C TABLE 2. RISE/FALL TIMES, VDD = 2.5V ±10%, T = 40 C TO 85 C LOAD (pf) DRIVE STRENGTH UNIT U Max. ns Typ. ns X Max. ns Typ. ns Z Max. ns Typ. ns S = standard Max. ns Typ. ns LOAD (pf) DRIVE STRENGTH UNIT U Max. ns Typ. ns X Max. ns Typ. ns S = standard Max. ns Typ. ns H Max. ns Typ. ns TABLE 3. RISE/FALL TIMES, VDD = 2.8V ±10%, T = 40 C TO 85 C TABLE 4. RISE/FALL TIMES, VDD = 3.3V ±10%, T = 40 C TO 85 C LOAD (pf) DRIVE STRENGTH UNIT U Max. ns Typ. ns X Max. ns Typ. ns S = standard Max. ns Typ. ns H Max. ns Typ. ns LOAD (pf) DRIVE STRENGTH UNIT U Max. ns Typ. ns S = standard Max. ns Typ. ns Z Max. ns Typ. ns H Max. ns Typ. ns Note: 4. All rise/fall times are measured for the thresholds of 20% to 80% of VDD. PAGE 4 OF 8 I SPEC 01 I REV.00 I OKTOBER 2014
5 0.75± ± ± ± ± ± PETERMANN-TECHNIK GmbH DIMENSIONS AND PATTERNS 2.5 X 2.0 X 0.75 MM RECOMMENDED LAND PATTERN (UNIT:MM) [5] 2.5± X 2.5 X 0.75 MM RECOMMENDED LAND PATTERN (UNIT:MM) 3.2± X 3.2 X 0.75 MM RECOMMENDED LAND PATTERN (UNIT:MM) 5.0± Note: 5. A capacitor value of 0.1 µf between VDD and GND is recommended. PAGE 5 OF 8 I SPEC 01 I REV.00 I OKTOBER 2014
6 0.90± ± ± ± PETERMANN-TECHNIK GmbH DIMENSIONS AND PATTERNS 7.0 X 5.0 X 0.90 MM RECOMMENDED LAND PATTERN (UNIT:MM) 7.0± X 5.0 X 0.90 MM WITH CENTER-PAD RECOMMENDED LAND PATTERN (UNIT:MM) 7.0± Do not connect the center pad or Connect it to device s GND REFLOW SOLDER PROFILE PAGE 6 OF 8 I SPEC 01 I REV.00 I OKTOBER 2014
7 ORDERING INFORMATION OSCILLATOR FAMILY LPSSO SUPPLY VOLTAGE 18 for 1.8V 25 for 2.5V 28 for 2.8V 33 for 3.3V TEMPERATURE RANGE M for C W for C FREQUENCY to MHz SPREAD SPECTRUM PERCENTAGE LPSSO E-50-M MHz-T-S-A FREQUENCY STABILITY 50 for ±50 PPM 100 for ±100 PPM Please specify when Spread=OFF is required PACKING METHOD B for Bulks or Tubes T for Tape & ReeL PACKAGE SIZE 2520 for 2.5 X 2.0 mm 3225 for 3.2 X 2.5 mm 5032 for 5.0 X 3.2 mm 7050 for 7.0 X 5.0 mm (without center-pad) 7051 for 7.0 X 5.0 mm (with center-pad) FEATURE PIN E for OUTPUT ENABLE S for STANDBY SD for SPREAD DISABLE (DOWN SPREAD ONLY) OUTPUT DRIVE STRENGTH S Standard (datasheet limits) See Tables 1 to 4 for rise/fall times U Z X H EXAMPLE: LPSSO E-50-M MHZ-T-S-A PLEASE INDICATE YOUR REQUIRED PARAMETERS EXPRESS SAMPLES ARE DELIVERABLE ON THE SAME DAY IF ORDERED UNTIL 02:00 PM! PAGE 7 OF 8 I SPEC 01 I REV.00 I OKTOBER 2014
8 PREMIUM QUALITY BY PETERMANN-TECHNIK OUR COMPANY IS CERTIFIED ACCORDING TO ISO 9001:2008 IN OC- TOBER 2013 BY THE DMSZ CERTIFIKATION GMBH. THIS IS FOR YOU TO ENSURE THAT THE PRINCIPLES OF QUALITY MANAGEMENT ARE FULLY IMPLEMENTED IN OUR QUALITY MA- NAGEMENT SYSTEM AND QUALITY CONTROL METHODS ALSO DO- MINATE OUR QUALITY STANDARDS. PETERMANN-TECHNIK GmbH The information contained herein is subject to change at any time without notice. PETERMANN-TECHNIK owns all rights, title and interest to the intellectual property related to PETERMANN-TECHNIK's products, including any software, firmware, copyright, patent, or trademark. The sale of PETERMANN-TECHNIK products does not convey or imply any license under patent or other rights. PETERMANN- TECHNIK retains the copyright and trademark rights in all documents, catalogs and plans supplied pursuant to or ancillary to the sale of products or services by PETERMANN-TECHNIK. Unless otherwise agreed to in writing by PETERMANN-TECHNIK, any reproduction, modification, translation, compilation, or representation of this material shall be strictly prohibited. PAGE 8 OF 8 I SPEC 01 I REV.00 I OKTOBER 2014
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