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LTC6946
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LTC6946

Ultralow Noise and Spurious 0.37GHz to 5.7GHz Integer-N Synthesizer with Integrated VCO

Manufacturer :
Linear Technology Corp. (ADI)
Product Categories :
Integrated Circuits (ICs)
Datasheet:
LTC6946 PDF
RoHs Status:
Lead free / RoHS Compliant
In-stock:
1988

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LTC6946 Product Details

The LTC�6946 is a high performance, low noise, 5.7GHz phase-locked loop (PLL) with a fully integrated VCO, including a reference divider, phase-frequency detector (PFD) with phase-lock indicator, ultralow noise charge pump, integer feedback divider, and VCO output divider. The charge pump contains selectable high and low voltage clamps useful for VCO monitoring. The integrated low noise VCO uses no external components. It is internally calibrated to the correct output frequency with no external system support. The part features a buffered, programmable VCO output divider with a range of 1 through 6, providing a wide frequency range.

FEATURES
LTC6946 Ultralow Noise and Spurious to 5.7GHz Integer-N Synthesizer with Integrated VCO DESCRIPTION

The is a high performance, low noise, 5.7GHz phase-locked loop (PLL) with a fully integrated VCO, including a reference divider, phase-frequency detector (PFD) with phase-lock indicator, ultralow noise charge pump, integer feedback divider, and VCO output divider. The charge pump contains selectable high and low voltage clamps useful for VCO monitoring. The integrated low noise VCO uses no external components. It is internally calibrated to the correct output frequency with no external system support. The part features a buffered, programmable VCO output divider with a range of 1 through 6, providing a wide frequency range.

Low Noise Integer-N PLL with Integrated VCO �226dBc/Hz Normalized In-Band Phase Noise Floor �274dBc/Hz Normalized In-Band 1/f Noise �157dBc/Hz Wideband Output Phase Noise Floor Excellent Spurious Performance Output Divider 6, 50% Duty Cycle) Output Buffer Muting Low Noise Reference Buffer Charge Pump Current Adjustable from to 11.2mA Configurable Status Output SPI Compatible Serial Port Control PLLWizardTM Software Design Tool Support

APPLICATIONS

Wireless Base Stations (LTE, WiMAX, W-CDMA, PCS) Broadband Wireless Access Military and Secure Radio Test and Measurement

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PLLWizard is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.

RMS NOISE 0.61� �140 RMS JITTER = 296fs fRF 5.7GHz �150 fPFD 10k 100k OFFSET FREQUENCY (Hz)

TOP VIEW VREF+ REF� REF+ VCP+ VRF+ GND 22 VVCO+ 21 GND 20 CMA 29 GND 19 CMB 18 CMC 17 GND TB 15 TUNE MUTE GND RF� RF+ BB CP

Supply Voltages V+ (VREF+, VREFO+, VRF+, VD+) to GND..................3.6V VCP+, V VCO+ to GND.............................................5.5V Voltage on CP Pin.................GND 0.3V to VCP+ + 0.3V Voltage on All Other Pins..........GND + 0.3V Operating Case Temperature Range (TC) (Note to 105�C Operating Junction Temperature........................... 125�C Storage Temperature Range.................. to 150�C

UFD PACKAGE s 5mm) PLASTIC QFN TJMAX = 7�C/W, EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB

LEAD FREE FINISH LTC6946IUFD-2#PBF LTC6946IUFD-3#PBF TAPE AND REEL LTC6946IUFD-2#TRPBF LTC6946IUFD-3#TRPBF PART MARKING 69462 69463 PACKAGE DESCRIPTION � 5mm) Plastic QFN � 5mm) Plastic QFN � 5mm) Plastic QFN CASE TEMPERATURE RANGE to 105�C

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: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/

SYMBOL PARAMETER Reference Inputs (REF+, REF�) Input Frequency fREF Input Signal Level VREF Input Slew Rate Input Duty Cycle Self-Bias Voltage Input Resistance Input Capacitance Reference Output (REFO) Output Frequency fREFO Output Power PREFO Output Impedance, Disabled VCO Frequency Range fVCO

The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are = 25�C. VREF+ VREF0+ = VD+ = VRF+ = 3.3V, VCP+ = VVCO+ = 5V unless otherwise specified (Note 2). All voltages are with respect to GND.

LTC6946-1 (Note 3) LTC6946-2 (Note 3) LTC6946-3 (Note 3) LTC6946-1 (Notes 4) LTC6946-2 (Notes 4) LTC6946-3 (Notes 3, 4)

RF Output (RF+, RF�) Output Frequency fRF O Output Divider Range Output Duty Cycle Output Resistance Output Common Mode Voltage Output Power, Single Ended, PRF(SE) fRF = 900MHz

All Integers Included Single Ended, Each Output to VRF+ 50, LC Match 50, LC Match 50, LC Match 50, LC Match = 50, Single Ended, fRF to 6

Output Power, Muted Mute Enable Time Mute Disable Time Phase/Frequency Detector Input Frequency fPFD Lock Indicator, Available on the STAT Pin and via the SPI-Accessible Status Register Lock Window Width = 0 tLWW = 3 tLWHYS Lock Window Hysteresis Increase in tLWW Moving from Locked State to Unlocked State Charge Pump Output Current Range 12 Settings (See Table 5) ICP Output Current Source/Sink Accuracy All Settings VCP = VCP+/2 Output Current Source/Sink Matching ICP to 1.4mA, VCP = VCP+/2 ICP to 11.2mA, VCP = VCP+/2


Technical Parameters

Manufacturer LINEAR RoHs Status Lead free / RoHS Compliant
Packing Tape & Reel (TR)/Cut Tape (CT)/Tray/Tube Package/Case

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Linear
Linear Technology designs, manufactures and markets a wide range of high performance standard integrated circuits. Product applications include telecommunications, cellular phones, networking products...
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