Datasheet

LTC6957-1/LTC6957-2/
LTC6957-3/LTC6957-4
36
6957f
For more information www.linear.com/LTC6957-1
 LINEAR TECHNOLOGY CORPORATION 2013
LT 0313 • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
●
www.linear.com/LTC6957-1
Typical applicaTion
relaTeD parTs
PART NUMBER DESCRIPTION COMMENTS
LT1715 4ns, 150MHz Dual Comparator General Purpose Comparator with Flexible Supply Voltages
LTC2209 16-Bit, 160Msps ADC High Speed and High Resolution Requires Low Phase Noise Clocks
LTC5517 40MHz to 900MHz Quadrature Demodulator 24dBm IIP3 at 240MHz, 9dB NF, 4dB Conversion Gain
LTC5598 5MHz to 1600MHz Direct I/Q Modulator 27.7dBm OIP3 at 140MHz, –160dBm/Hz, –50.4dBc Image Rejection, –55dBm
Carrier Suppression
LTC6945 350MHz to 6GHz PLL Synthesizer Integer-N PLL, –226dBc/Hz Normalized In-Band Phase Noise Floor
LTC6946-1 373MHz to 3.74GHz PLL + VCO Integer-N PLL, –157dBc/Hz Wideband Output Phase Noise Floor, –226dBc/Hz
Normalized In-Band Phase Noise Floor, < –100dBc Spurious Output
LTC6946-2 513MHz to 4.91GHz PLL + VCO
LTC6946-3 640MHz to 5.79GHz PLL + VCO
10MHz Frequency Reference Input Stage with Dual CMOS Outputs
10MHz REFERENCE INPUT POWER
WITH REFERENCE TO 50Ω (dBm)
–10
–170
PHASE NOISE AT 100kHz OFFSET (dBc/Hz)
–165
–160
–155
–140
–8 –6 –4 –2 0 2 4 6 8
69571234 TA03b
–145
–150
10
FILTA = L, FILTB = L
FILTA = H, FILTB = L
FILTA = L, FILTB = H
FILTA = H, FILTB = H
OPTIMUM FILT SETTINGS
6957 TA03a
LTC6957-3
12
11
10
9
8
7
FILTA
V
+
IN
+
IN
–
GND
FILTB
SD1OUT
V
DD
OUT1
OUT2
GNDOUT
SD2
1
2
3
4
5
6
R1
100Ω
R1
100Ω
HSMS-281C
COILCRAFT
WBC16-1T
3.3V 3.3V
••
0.1µF0.1µF
0.1µF
0.1µF
R2
604k
10MHz
REF IN
–10dBm to
24dBm
0.1µF
CMOS OUT1,
10MHz
CMOS OUT2,
10MHz
TO PHASE NOISE MEASUREMENT
0.1µF
FILTB
FILTA
100Ω
0.1µF
100Ω
Additive Phase Noise
vs Input Amplitude