LTC6908-1/LTC6908-2 Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation FEATURES DESCRIPTIO LTC6908-1: Complementary Outputs (0/180) The LTC 6908 is an easy-to-use precision oscillator that LTC6908-2: Quadrature Outputs (0/90) provides 2-outputs, shifted by either 180 or 90. The 50kHz to 10MHz Frequency Range oscillator frequency is programmed by a single external One External Resistor Sets the Frequency resistor (R ) and spread spectrum frequency modulation SET Optional Spread Spectrum Frequency Modulation (SSFM) can be activated for improved electromagnetic for Improved EMC Performance compatibility (EMC) performance. 10% Frequency Spreading The LTC6908 operates with a single 2.7V to 5.5V supply + 400A Supply Current Typical (V = 5V, 50kHz) and provides rail-to-rail, 50% duty cycle square wave + Frequency Error 1.5% Max (T = 25C, V = 3V) A outputs. A single resistor from 10k to 2M is used to select 40ppm/C Temperature Stability an oscillator frequency from 50kHz to 10MHz (5V supply). Fast Start-Up Time: 260s Typical (1MHz) The oscillator can be easily programmed using the simple Outputs Muted Until Stable formula outlined below: Operates from a Single 2.7V to 5.5V Supply f =10MHz 10k/R Available in Low Pro le (1mm) ThinSOT and DFN OUT SET (2mm 3mm) Packages The LTC6908s SSFM capability modulates the output frequency by a pseudorandom noise (PRN) signal to U decrease the peak electromagnetic radiation level and APPLICATIO S improve EMC performance. The amount of frequency Switching Power Supply Clock Reference spreading is xed at 10% of the center frequency. When Portable and Battery-Powered Equipment SSFM is enabled, the rate of modulation is selected by the Precision Programmable Oscillator user. The three possible modulation rates are f /16, OUT Charge Pump Driver f /32 and f /64. OUT OUT , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATIO 150kHz to 30MHz Output Frequency Spectrum 2.25MHz, 2.5V/8A Step-Down Regulator (9kHz Res BW) 0 V IN SSFM DISABLED 2.8V TO 5.5V C IN 10 100F SV TRACK PV IN IN 0.2H C V 20 OUT BYP + R SW 2.5V V OUT1 T 30 8A LTC3418 2.2M 41.2k LTC6908-1 0.1F PGOOD 40 C OUT GND OUT2 100F RUN/SS PGND 0 2 44.2k I SGND 1000pF TH SSFM ENABLED 10 4.99k SYNC/MODE V SET MOD FB 690812 TA01a 20 820pF 4.32k f = 10MHz 10k/R OUT SET 30 2k 40 150kHz 30MHz FREQUENCY (FUNDAMENTAL AND HARMONICS SHOWN) 690812 TA01b 690812fa 1 OUTPUT (dBc) OUTPUT (dBc) U ULTC6908-1/LTC6908-2 ABSOLUTE AXI U RATI GS (Note 1) + Total Supply Voltage (V to GND) ...............................6V Speci ed Temperature Range (Note 3) Maximum Voltage on any Pin LTC6908CS6-1/LTC6908CS6-2 ................ 0C to 70C + (GND 0.3V) V (V + 0.3V) LTC6908IS6-1/LTC6908IS6-2 .............. 40C to 85C PIN Output Short Circuit Duration .......................... Inde nite LTC6908HS6-1/LTC6908HS6-2 ......... 40C to 125C Operating Temperature Range (Note 2) LTC6908CDCB-1/LTC6908CDCB-2 .......... 0C to 70C LTC6908CS6-1/LTC6908CS6-2 ............ 40C to 85C LTC6908IDCB-1/LTC6908IDCB-2 ......... 40C to 85C LTC6908IS6-1/LTC6908IS6-2 .............. 40C to 85C Storage Temperature Range (S6) ........... 65C to 150C LTC6908HS6-1/LTC6908HS6-2 ......... 40C to 125C Storage Temperature Range (DCB) ........ 65C to 125C LTC6908CDCB-1/LTC6908CDCB-2 ...... 40C to 85C Lead Temperature (Soldering, 10sec) ................... 300C LTC6908IDCB-1/LTC6908IDCB-2 ......... 40C to 85C UUW PACKAGE/ORDER I FOR ATIO TOP VIEW 6 5 4 TOP VIEW + V 1 6 OUT1 7 GND 2 5 OUT2 SET 3 4 MOD S6 PACKAGE 1 2 3 6-LEAD PLASTIC TSOT-23 T = 150C, = 230C/W JMAX JA DCB PACKAGE 6-LEAD (2mm 3mm) PLASTIC DFN T = 125C, = 64C/W JMAX JA EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB ORDER PART NUMBER DCB PART MARKING* ORDER PART NUMBER S6 PART MARKING* LTC6908CDCB-1 LBXZ LTC6908CS6-1 LTBYC LTC6908IDCB-1 LBXZ LTC6908IS6-1 LTBYC LTC6908CDCB-2 LBYB LTC6908HS6-1 LTBYC LTC6908IDCB-2 LBYB LTC6908CS6-2 LTBYD LTC6908IS6-2 LTBYD LTC6908HS6-2 LTBYD Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: