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LTC6947 fiches techniques PDF

Linear Technology - Ultralow Noise 0.35GHz to 6GHz Fractional-N Synthesizer

Numéro de référence LTC6947
Description Ultralow Noise 0.35GHz to 6GHz Fractional-N Synthesizer
Fabricant Linear Technology 
Logo Linear Technology 





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LTC6947 fiche technique
LTC6947
Ultralow Noise 0.35GHz to
6GHz Fractional-N Synthesizer
Features
Description
n Low Noise Fractional-N PLL
n No ∆Σ Modulator Spurs
n 18-Bit Fractional Denominator
n 350MHz to 6GHz VCO Input Range
n –226dBc/Hz Normalized In-Band Phase Noise Floor
n –274dBc/Hz Normalized In-Band 1/f Noise
n –157dBc/Hz Wideband Output Phase Noise Floor
n Excellent Integer Boundary Spurious Performance
n Output Divider (1 to 6, 50% Duty Cycle)
n Output Buffer Muting
n Charge Pump Supply from 3.15V to 5.25V
n Charge Pump Current from 1mA to 11.2mA
n Reference Input Frequency Up to 425MHz
n Fast Frequency Switching
n FracNWizard™ Software Design Tool Support
Applications
n Wireless Basestations (LTE, WiMAX, W-CDMA, PCS)
n Broadband Wireless Access
n Microwave Data Links
n Military and Secure Radio
n Test and Measurement
The LTC®6947 is a high performance, low noise, 6GHz
phase-locked loop (PLL), including a reference divider,
phase-frequency detector (PFD), ultralow noise charge
pump, fractional feedback divider, and VCO output divider.
The fractional divider uses an advanced, 4th order Δ∑
modulator which provides exceptionally low spurious
levels. This allows wide loop bandwidths, producing
extremely low integrated phase noise values.
The programmable VCO output divider, with a range of 1
through 6, extends the output frequency range. The dif-
ferential, low-noise output buffer has user-programmable
output power ranging from –4.3dBm to +4.5dBm, and may
be muted through either a digital input pin or 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
FracNWizard is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Typical Application
11GHz Source for Satellite Communications
0.1µF
0.1µF
10nF
3.3V
1µF
60.4Ω 5V
5V
0.01µF
3.3V
1µF
100MHz
51.1Ω
SPI BUS
3.3V
3.3V
REF+
STAT
CS
SCLK
SDI
SDO
LDO
VD+
LTC6947IUFD
GND
GND
GND
GND
GND
GND
VCO+
VCO
4.99k
4.99k 0.1µF
0.01µF
+ 47µF
13V
+ LT1678IS8
OUT
10nF
0.1µF 5V
3.3nF
60.4Ω
220nF
100pF
fLO/2
100pF
VTUNE
MA-COM
MAOC-009266
47nF
0.1µF
75Ω
1nF
0.1µF
3.3V 68nH
3.3V 1µF
fLO = 10.2GHz TO 11.3GHz IN 381.4Hz STEPS
0.01µF
68nH 100pF
0.01µF
100pF
R = 2, fPFD = 50MHz
N = 102 TO 113
LBW = 33.6kHz
AUXILIARY OUTPUTS
fLO/2, /4, /6, /8, /10 OR /12
6947 TA01a
For more information www.linear.com/LTC6947
System Phase Noise,
fRF = 11.260GHz
–80
–90
–100
–110
–120
–130
–140
–150
RMS NOISE = 0.549°
RMS JITTER = 135fs
–160
fPFD = 50MHz
LOOP BW = 34kHz
–170 INTN = 0
–180 CPLE = 1
100 1k 10k 100k 1M 10M 100M
OFFSET FREQUENCY (Hz)
6946 TA01b
6947f
1

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