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Linear Technology Electronic Components Datasheet

LTC6945 Datasheet

Ultralow Noise and Spurious 0.35GHz to 6GHz Integer-N Synthesizer

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LTC6945
Features
Ultralow Noise and Spurious
0.35GHz to 6GHz Integer-N
Synthesizer
Description
nn Low Noise Integer-N PLL
nn 350MHz to 6GHz VCO Input Range
nn –226dBc/Hz Normalized In-Band Phase Noise Floor
nn –274dBc/Hz Normalized In-Band 1/f Noise
nn –157dBc/Hz Wideband Output Phase Noise Floor
nn Excellent Spurious Performance
nn Output Divider (1 to 6, 50% Duty Cycle)
nn Low Noise Reference Buffer
nn Output Buffer Muting
nn Charge Pump Supply from 3.15V to 5.25V
nn Charge Pump Current from 250µA to 11.2mA
nn Configurable Status Output
nn SPI Compatible Serial Port Control
nn PLLWizard™ Software Design Tool Support
Applications
nn Wireless Base Stations (LTE, WiMAX, W-CDMA, PCS)
nn Broadband Wireless Access
nn Microwave Data Links
nn Military and Secure Radio
nn Test and Measurement
The LTC®6945 is a high performance, low noise, 6GHz phase-
locked loop (PLL), including a reference divider, phase-
frequency detector (PFD) with phase-lock indicator, charge
pump, integer feedback divider and VCO output divider.
The part features a buffered, programmable VCO output
divider with a range of 1 through 6. The differential, low
noise output buffer has user-programmable output power
ranging from –6dBm to 3dBm, and may be muted through
either a digital input pin or software.
The low noise reference buffer outputs a typical 0dBm
square wave directly into a 50Ω impedance from 10MHz
to 250MHz, or may be disabled through software.
The ultralow noise charge pump contains selectable high
and low voltage clamps useful for VCO monitoring, and
also may be set to provide a V+/2 bias.
All device settings are controlled through a SPI-compatible
serial port.
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.
Typical Application
LTC6945 Data Converter Sample Clock
3.3V LOOP
0.1µF
BANDWIDTH
~2.3kHz
VTUNE
5V CRYSTEK
CVCSO-914-1000
100MHz
REF 1µF
51.1Ω
1µF
5V
0.1µF
432Ω
570nF
47nF
3.3V
0.1µF
SPI BUS
3.3V
0.1µF
REFREF+
VREFO+
VREF+ CP VCP+VGVNCOD+
REFO
STAT
LTC6945
GND
GND
CS
SCLK
GND
GND
GND
SDI GND
SDO
VD+
MUTE
fPFD = 25MHz
GND RFRF+ VRF+
VCO+
VCO–
BB
3.3V 0.01µF
16.5Ω
100pF
1.0µF
100pF
16.5Ω
16.5Ω
100pF
68nH
3.3V
100pF
50Ω
3.3V 0.01µF
68nH
3.3V
100pF
ALT SAMPLE CLOCK
500MHz OR 1GHz
SAMPLE CLOCK
1GHz, 7dBm
6945 TA01b
1GHz Sample Clock Phase Noise
–100
–110
–120
–130
–140
–150
–160
–170
–180
100
DSB INTEGRATION
(100Hz TO 1GHz)
RMS NOISE = 0.014°
RMS JITTER = 39fs
fPFD = 25MHz
BW = 2.3kHz
1k 10k 100k 1M
OFFSET FREQUENCY (Hz)
10M 40M
6945 TA01b
For more information www.linear.com/LTC6945
6945fa
1


Linear Technology Electronic Components Datasheet

LTC6945 Datasheet

Ultralow Noise and Spurious 0.35GHz to 6GHz Integer-N Synthesizer

No Preview Available !

LTC6945
Absolute Maximum Ratings
(Note 1)
Supply Voltages
V VoollVVttaa+CggP(+eeVtRoooEnnFG+CAN,PllVDOPR...tiE.nh.F..eO....r+....,P....Vi..n..R..s..F...+......,......V......V..G..C..N..O.G.D+.N,..–DV...D0.–.+..3).0.Vt...o3.t.Vo.G..tNV.o.D.C.VP....++......++....5003....5633VVVV
Operating Junction Temperature Range, TJ (Note 2)
LTC6945I................................................ –40°C to 105°C
Junction Temperature, TJMAX................................. 125°C
Storage Temperature Range................... –65°C to 150°C
Pin Configuration
TOP VIEW
28 27 26 25 24 23
VREFO+ 1
22 VVCO+
REFO 2
21 GND
STAT 3
20 GND
CS 4
SCLK 5
29 19 GND
GND 18 GND
SDI 6
SDO 7
VD+ 8
9
17 GND
16 VCO+
15 VCO
10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJCbottom = 3°C/W, θJCtop = 26°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING PACKAGE DESCRIPTION
LTC6945IUFD#PBF
LTC6945IUFD#TRPBF 6945
28-Lead (4mm × 5mm) Plastic QFN
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/
JUNCTION TEMPERATURE RANGE
–40°C to 105°C
E lectrical Characteristics The l denotes the specifications which apply over the full operating
junction temperature
otherwise specified.
range, otherwise specifications are at
All voltages are with respect to GND.
TA
=
25°C.
VREF+
=
VREF0+
=
VD+
=
VRF+
=
VVCO+
=
3.3V,
VCP+
=
5V
unless
SYMBOL PARAMETER
Reference Inputs (REF+, REF)
fREF Input Frequency
VREF Input Signal Level
Input Slew Rate
Input Duty Cycle
Self-Bias Voltage
Input Resistance
Input Capacitance
Reference Output (REFO)
fREFO
PREFO
Output Frequency
Output Power
Output Impedance, Disabled
CONDITIONS
Single-Ended, 1µF AC-Coupling Capacitors
Differential
Differential
fREFO = 10MHz, RLOAD = 50Ω
MIN TYP MAX
l 10
250
l 0.5 2 2.7
l 20
50
l 1.65 1.85 2.25
l 6.2
8.4 11.6
3
l 10
250
l –0.2
3.2
800
UNITS
MHz
VP-P
V/µs
%
V
pF
MHz
dBm
Ω
6945fa
2 For more information www.linear.com/LTC6945


Part Number LTC6945
Description Ultralow Noise and Spurious 0.35GHz to 6GHz Integer-N Synthesizer
Maker Linear
Total Page 28 Pages
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