LTC6908CDCB-1#TRPBF Analog Devices

LTC6908-1/LTC6908-2 Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation FEATURES DESCRIPTION n LTC6908-1: Complementary Outputs (0/180) The LTC 6908 is an easy-to-use precision oscillator that n LTC6908-2: Quadrature Outputs (0/90) provides 2-outputs, shifted by either 180 or 90. The n 50kHz to 10MHz Frequency Range oscillator frequency is programmed by a single external n One External Resistor Sets the Frequency resistor (R ) and spread spectrum frequency modula- SET n Optional Spread Spectrum Frequency Modulation tion (SSFM) can be activated for improved electromag- for Improved EMC Performance netic compatibility (EMC) performance. n 10% Frequency Spreading The LTC6908 operates with a single 2.7V to 5.5V supply + n 400A Supply Current Typical (V = 5V, 50kHz) and provides rail-to-rail, 50% duty cycle square wave out- + n Frequency Error 1.5% Max (T = 25C, V = 3V) A puts. A single resistor from 10k to 2M is used to select an n 40ppm/C Temperature Stability oscillator frequency from 50kHz to 10MHz (5V supply). n Fast Start-Up Time: 260s Typical (1MHz) The oscillator can be easily programmed using the simple n Outputs Muted Until Stable formula outlined below: n Operates from a Single 2.7V to 5.5V Supply n f =10MHz 10k/R Available in Low Profile (1mm) ThinSOT and DFN OUT SET (2mm 3mm) Packages The LTC6908s SSFM capability modulates the output n AEC-Q100 Qualified for Automotive Applications frequency by a pseudorandom noise (PRN) signal to decrease the peak electromagnetic radiation level and improve EMC performance. The amount of frequency APPLICATIONS spreading is fixed at 10% of the center frequency. When n Switching Power Supply Clock Reference SSFM is enabled, the rate of modulation is selected by n Portable and Battery-Powered Equipment the user. The three possible modulation rates are f /16, OUT n Precision Programmable Oscillator f /32 and f /64. OUT OUT n Charge Pump Driver All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION 150kHz to 30MHz Output Frequency Spectrum 2.25MHz, 2.5V/8A Step-Down Regulator (9kHz Res BW) V IN 0 2.8V TO 5.5V C IN SSFM DISABLED 100F 10 SV TRACK PV IN IN 0.2H C V OUT BYP 20 + R SW 2.5V V OUT1 T 8A LTC3418 2.2M 30 41.2k 0.1F LTC6908-1 PGOOD C OUT 40 GND OUT2 PGND 100F RUN/SS 2 0 44.2k I SGND 1000pF TH SSFM ENABLED 4.99k SYNC/MODE V SET MOD 10 FB 690812 TA01a 820pF 20 4.32k f = 10MHz 10k/R OUT SET 30 2k 40 150kHz 30MHz FREQUENCY (FUNDAMENTAL AND HARMONICS SHOWN) 690812 TA01b Rev C 1 Document Feedback For more information www.analog.com OUTPUT (dBc) OUTPUT (dBc)LTC6908-1/LTC6908-2 (Note 1) ABSOLUTE MAXIMUM RATINGS + Total Supply Voltage (V to GND) ................................6V Specified 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 .......................... Indefinite 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 PIN CONFIGURATION 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 INFORMATION Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC6908CDCB-1 TRMPBF LTC6908CDCB-1 TRPBF LBXZ 6-Lead (2mm 3mm) Plastic DFN 0C to 70C LTC6908IDCB-1 TRMPBF LTC6908IDCB-1 TRPBF LBXZ 6-Lead (2mm 3mm) Plastic DFN 40C to 85C LTC6908CDCB-2 TRMPBF LTC6908CDCB-2 TRPBF LBYB 6-Lead (2mm 3mm) Plastic DFN 0C to 70C LTC6908IDCB-2 TRMPBF LTC6908IDCB-2 TRPBF LBYB 6-Lead (2mm 3mm) Plastic DFN 40C to 85C LTC6908CS6-1 TRMPBF LTC6908CS6-1 TRPBF LTBYC 6-Lead Plastic TSOT-23 0C to 70C LTC6908IS6-1 TRMPBF LTC6908IS6-1 TRPBF LTBYC 6-Lead Plastic TSOT-23 40C to 85C LTC6908HS6-1 TRMPBF LTC6908HS6-1 TRPBF LTBYC 6-Lead Plastic TSOT-23 40C to 125C LTC6908CS6-2 TRMPBF LTC6908CS6-2 TRPBF LTBYD 6-Lead Plastic TSOT-23 0C to 70C LTC6908IS6-2 TRMPBF LTC6908IS6-2 TRPBF LTBYD 6-Lead Plastic TSOT-23 40C to 85C LTC6908HS6-2 TRMPBF LTC6908HS6-2 TRPBF LTBYD 6-Lead Plastic TSOT-23 40C to 125C Rev C 2 For more information www.analog.com SET MOD + V OUT2 GND OUT1