LTC6946 Ultralow Noise and Spurious 0.37GHz to 6.39GHz Integer-N Synthesizer with Integrated VCO Fea T Descrip T n Low Noise Integer-N PLL with Integrated VCO The LTC 6946 is a high performance, low noise, 6.39GHz n 226dBc/Hz Normalized In-Band Phase Noise Floor phase-locked loop (PLL) with a fully integrated VCO, n 274dBc/Hz Normalized In-Band 1/f Noise including a reference divider, phase-frequency detector n (PFD) with phase-lock indicator, ultralow noise charge 157dBc/Hz Wideband Output Phase Noise Floor n pump, integer feedback divider, and VCO output divider. Excellent Spurious Performance n The charge pump contains selectable high and low voltage Output Divider (1 to 6, 50% Duty Cycle) n clamps useful for VCO monitoring. Output Buffer Muting n Low Noise Reference Buffer The integrated low noise VCO uses no external components. n Charge Pump Current Adjustable from 250A to It is internally calibrated to the correct output frequency 11.2mA with no external system support. n Configurable Status Output The part features a buffered, programmable VCO output n SPI Compatible Serial Port Control divider with a range of 1 through 6, providing a wide n PLLWizard Software Design Tool Support frequency range. Frequency Coverage Options a T LTC6946-1 LTC6946-2 LTC6946-3 LTC6946-4 n Wireless Base Stations (LTE, WiMAX, W-CDMA, PCS) O DIV=1 2.240 to 3.740 3.080 to 4.910 3.840 to 5.790 4.200 to 6.390 n Broadband Wireless Access O DIV=2 1.120 to 1.870 1.540 to 2.455 1.920 to 2.895 2.100 to 3.195 n Military and Secure Radio 0 DIV=3 0.747 to 1.247 1.027 to 1.637 1.280 to 1.930 1.400 to 2.130 n Test and Measurement O DIV=4 0.560 to 0.935 0.770 to 1.228 0.960 to 1.448 1.050 to 1.598 L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and O DIV=5 0.448 to 0.748 0.616 to 0.982 0.768 to 1.158 0.840 to 1.278 PLLWizard is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. O DIV=6 0.373 to 0.623 0.513 to 0.818 0.640 to 0.965 0.700 to 1.065 Typical a T 5.7GHz Wideband Receiver LTC6946-3 PLL Phase Noise 4.7nF 80 0.01F 5V 57nF 97.6 15 0.01F 2.2F 3.3V 90 100 RF INPUT 1F 68nH 68nH SIGNAL 110 0.01F GND BB 0.01F + + 100pF V V 3.3V 120 CP RF RF TO IF + CP RF LO IF 130 PROCESSING LTC6946-3 + 3.3V V RF REF RMS NOISE = 0.61 0.01F + 100pF 140 REF GND RMS JITTER = 296fs 1F f = 5.7GHz RF REF MUTE 150 50 f = 10MHz PFD + 1F BW = 85kHz 160 10MHz 51.1 6946 TA01a 100 1k 10k 100k 1M 10M 40M UNUSED OUTPUT OFFSET FREQUENCY (Hz) 3.3V 3.3V IS AVAILABLE 0.1F 0.1F 6946 TA01b FOR OTHER USE SPI BUS 6946fb 1 For more information www.linear.com/LTC6946 + + V V REFO VCO REFO GND STAT CM A CS CM B SCLK CM C SDI GND SDO TB + V TUNE D PHASE NOISE (dBc/Hz) ion pplica ions pplica ion uresLTC6946 a Te Maxi Mu M r a T p c F T (Note 1) TOP VIEW Supply Voltages + + + + + V (V , V , V , V ) to GND ..................3.6V REF REFO RF D + + V , V to GND .............................................5.5V 28 27 26 25 24 23 CP VCO + + + V 1 22 V REFO Voltage on CP Pin .................GND 0.3V to V + 0.3V VCO CP + REFO 2 21 GND Voltage on All Other Pins ..........GND 0.3V to V + 0.3V STAT 3 20 CM A Operating Junction Temperature Range, T (Note 2) J CS 4 19 CM 29 B LTC6946I ............................................... 40C to 105C GND SCLK 5 18 CM C Junction Temperature, T ................................ 125C JMAX SDI 6 17 GND Storage Temperature Range .................. 65C to 150C SDO 7 16 TB + V 8 15 TUNE D 9 10 11 12 13 14 UFD PACKAGE 28-LEAD (4mm 5mm) PLASTIC QFN T = 125C, = 3C/W, = 26C/W JMAX JCbottom JCtop EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION JUNCTION TEMPERATURE RANGE LTC6946IUFD-1 PBF LTC6946IUFD-1 TRPBF 69461 28-Lead (4mm 5mm) Plastic QFN 40C to 105C LTC6946IUFD-2 PBF LTC6946IUFD-2 TRPBF 69462 28-Lead (4mm 5mm) Plastic QFN 40C to 105C LTC6946IUFD-3 PBF LTC6946IUFD-3 TRPBF 69463 28-Lead (4mm 5mm) Plastic QFN 40C to 105C LTC6946IUFD-4 PBF LTC6946IUFD-4 TRPBF 69464 28-Lead (4mm 5mm) Plastic QFN 40C to 105C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: