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LTC6947

更新时间： 2024-09-28 14:57:19
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
32页 422K
描述
超低噪声 0.35GHz 至 6GHz 分数 N 合成器

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LTC6947 数据手册

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LTC6947  
Ultralow Noise 0.35GHz to  
6GHz Fractional-N Synthesizer  
FeaTures  
DescripTion  
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,fractionalfeedbackdivider,andVCOoutputdivider.  
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  
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.  
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)  
Output Buffer Muting  
n
n
n
n
n
n
The programmable VCO output divider, with a range of 1  
through 6, extends the output frequency range. The dif-  
ferential, low-noise outputbuffer has user-programmable  
outputpowerrangingfrom–4.3dBmto+4.5dBm,andmay  
be muted through either a digital input pin or software.  
Charge Pump Supply from 3.15V to 5.25V  
Charge Pump Current from 1mA to 11.2mA  
Reference Input Frequency Up to 425MHz  
Fast Frequency Switching  
FracNWizard™ Software Design Tool Support  
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.  
+
applicaTions  
n
AlldevicesettingsarecontrolledthroughaSPI-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.  
Wireless Basestations (LTE, WiMAX, W-CDMA, PCS)  
n
Broadband Wireless Access  
n
Microwave Data Links  
n
Military and Secure Radio  
n
Test and Measurement  
Typical applicaTion  
11GHz Source for Satellite Communications  
13V  
4.99k  
System Phase Noise,  
fRF = 11.260GHz  
10nF  
5V  
60.4Ω  
47µF  
+
4.99k  
0.1µF  
+
–
LT1678IS8  
OUT  
3.3V  
5V  
0.1µF  
0.1µF  
–80  
–90  
0.01µF  
1µF  
3.3V  
–100  
–110  
–120  
–130  
–140  
–150  
–160  
10nF  
0.01µF  
1µF  
100MHz  
51.1Ω  
+
3.3nF  
REF  
GND  
GND  
GND  
220nF  
STAT  
CS  
SCLK  
SDI  
SDO  
LDO  
+
60.4Ω  
5V  
0.1µF  
GND  
GND  
GND  
RMS NOISE = 0.549°  
RMS JITTER = 135fs  
PFD  
LOOP BW = 34kHz  
SPI BUS  
LTC6947IUFD  
100pF  
75Ω  
1nF  
f
= 50MHz  
47nF  
f
/2  
VTUNE  
MA-COM  
LO  
+
0.1µF  
VCO  
–170 INTN = 0  
3.3V  
–
V
D
VCO  
CPLE = 1  
3.3V  
–180  
MAOC-009266  
100pF  
100  
1k  
10k 100k  
1M  
10M 100M  
0.1µF  
OFFSET FREQUENCY (Hz)  
3.3V  
1µF  
3.3V  
6946 TA01b  
68nH  
f
= 10.2GHz TO 11.3GHz IN 381.4Hz STEPS  
LO  
0.01µF  
R = 2, f  
N = 102 TO 113  
LBW = 33.6kHz  
= 50MHz  
68nH  
PFD  
0.01µF  
100pF  
100pF  
AUXILIARY OUTPUTS  
f
LO  
/2, /4, /6, /8, /10 OR /12  
6947 TA01a  
6947f  
1
For more information www.linear.com/LTC6947  
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