LTC6957-1/LTC6957-2/ LTC6957-3/LTC6957-4 Low Phase Noise, Dual Output Buffer/Driver/ Logic Converter FEATURES DESCRIPTION n Low Phase Noise Buffer/Driver The LTC 6957-1/LTC6957-2/LTC6957-3/LTC6957-4 is a n family of very low phase noise, dual output AC signal Optimized Conversion of Sine Wave Signals to buffer/driver/logic level translators. The input signal can Logic Levels n be a sine wave or any logic level (2V ). There are four Three Logic Output Types Available P-P n members of the family that differ in their output logic LVPECL n signal type as follows: LVDS n CMOS LTC6957-1: LVPECL Logic Outputs n Additive Jitter 45fs (LTC6957-1) RMS LTC6957-2: LVDS Logic Outputs n Frequency Range Up to 300MHz n 3.15V to 3.45V Supply Operation LTC6957-3: CMOS Logic, In-Phase Outputs n Low Skew 3ps Typical LTC6957-4: CMOS Logic, Complementary Outputs n Fully Specified from 40C to 125C n The LTC6957 will buffer and distribute any logic signal 12-Lead MSOP and 3mm 3mm DFN Packages with minimal additive noise, however, the part really APPLICATIONS excels at translating sine wave signals to logic levels. The early amplifier stages have selectable lowpass filtering n System Reference Frequency Distribution to minimize the noise while still amplifying the signal to n High Speed ADC, DAC, DDS Clock Driver increase its slew rate. This input stage filtering/noise limit- n Military and Secure Radio ing is especially helpful in delivering the lowest possible n Low Noise Timing Trigger phase noise signal with slow slewing input signals such n Broadband Wireless Transceiver as a typical 10MHz sine wave system reference. n High Speed Data Acquisition All registered trademarks and trademarks are the property of their respective owners. Protected n Medical Imaging by U.S. Patents 7969189 and 8319551. n Test and Measurement TYPICAL APPLICATION 3.3V Additive Phase Noise at 100MHz 0.1F 140 SINGLE-ENDED SINE WAVE INPUT AT +7dBm (500mV ) RMS FILTA = FILTB = GND + V SD1 145 FILTA FILTB TO PLL CHIPS LTC6957-2 (LVDS) 100MHz OUT1 150 OR SYSTEM +7dBm 10nF SAMPLING CLOCKS LTC6957-4 (CMOS) SINE WAVE + IN OCXO 155 IN 50 10nF OUT2 LTC6957-3 160 (CMOS) LTC6957-1 (LVPECL) GND SD2 165 6957 TA01a 100 1k 10k 100k 1M OFFSET FREQUENCY (Hz) 69571234 TA01b 6957fb 1 For more information www.linear.com/LTC6957-1 PHASE NOISE (dBc/Hz)LTC6957-1/LTC6957-2/ LTC6957-3/LTC6957-4 ABSOLUTE MAXIMUM RATINGS (Note 1) + Supply Voltage (V or V ) to GND ..........................3.6V Specified Temperature Range DD + Input Current (IN , IN , FILTA, FILTB, SD1, SD2) LTC6957I .............................................40C to 85C (Note 2) .......................................................... 10mA LTC6957H .......................................... 40C to 125C LTC6957-1 Output Current ........................ 1mA, 30mA Junction Temperature .......................................... 150C LTC6957-2 Output Current ................................. 10mA Storage Temperature Range ................. 65C to 150C LTC6957-3, LTC6957-4 Output Current (Note 3) .. 30mA Lead Temperature (for MSOP Soldering, 10sec) ...300C PIN CONFIGURATION LTC6957-1, LTC6957-2 LTC6957-3, LTC6957-4 TOP VIEW TOP VIEW 1 SD1 1 SD1 FILTA 12 FILTA 12 + + + V 2 11 OUT1 V 2 11 V DD + + 3 3 IN 10 OUT1 IN 10 OUT1 13 13 GND GND 4 4 9 OUT2 9 OUT2 IN IN + 5 8 5 8 GND OUT2 GND GNDOUT 6 7 6 7 FILTB SD2 FILTB SD2 DD PACKAGE DD PACKAGE 12-LEAD (3mm 3mm) PLASTIC DFN 12-LEAD (3mm 3mm) PLASTIC DFN T = 150C, = 58C/W, = 10C/W T = 150C, = 58C/W, = 10C/W JMAX JA JC JMAX JA JC EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB LTC6957-1, LTC6957-2 LTC6957-3, LTC6957-4 TOP VIEW TOP VIEW FILTA 1 12 SD1 FILTA 1 12 SD1 + + + V 2 11 OUT1 V 2 11 V DD + + IN 3 10 OUT1 IN 3 10 OUT1 IN 4 9 OUT2 IN 4 9 OUT2 + GND 5 8 OUT2 GND 5 8 GNDOUT FILTB 6 7 SD2 FILTB 6 7 SD2 MS PACKAGE MS PACKAGE 12-LEAD PLASTIC MSOP 12-LEAD PLASTIC MSOP T = 150C, = 145C/W T = 150C, = 145C/W JMAX JA JMAX JA 6957fb 2 For more information www.linear.com/LTC6957-1