LTC6945 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC6945' PDF : 28 Pages View PDF
LTC6945
TYPICAL APPLICATION
LTC6945 Wideband Point-to-Point Radio Local Oscillator
5V
4.99k
4.99k
0.1μF
3.3V
0.1μF
47μF
100MHz 51.1Ω
REF
470pF
470pF
5V 0.1μF
11V 0.1μF
LT1678IS8 +
–
18.3nF
LOOP BANDWIDTH = ~21.4kHz
230nF
113Ω
0.1μF 3.3V
REF– REF+
VREFO+
VREF+
CP VCP+VGVNCOD+
REFO
GND
LTC6945
STAT
GND
CS
GND
GND
SPI BUS
SCLK
GND
SDI
GND
SDO
O_DIV = 2
VCO+
3.3V
VD+
VCO–
0.1μF
MUTE GND RF– RF+ VRF+ BB
3.3V 0.01μF
100pF
100pF
100Ω
VTUNE
4.7nF
5V RFMD
UMZ-T2-227-O16-G
6945 TA03a
1.0μF
Radio Local Oscillator
Phase Noise, fRF = 5725MHz
–80
–90
–100
–110
–120
–130
–140 RMS NOISE = 0.47°
RMS JITTER = 230fs
–150 fPFD = 5MHz
BW = 21kHz
–160
100 1k 10k 100k 1M
OFFSET FREQUENCY (Hz)
10M 40M
6945 TA03b
68nH
3.3V
100pF
50Ω
3.3V 0.01μF
68nH
3.3V
100pF
LO OUT
4900MHz TO 5900MHz
IN STEPS OF 5MHz
RELATED PARTS
PART NUMBER
LTC6946-x
LTC5540/LTC5541
LTC5542/LTC5543
LTC5590/LTC5591
LTC5592/LTC5593
LTC5569
LTC5588-1
LT®5575
DESCRIPTION
Ultralow Noise and Spurious Integer-N PLL with
Integrated VCO
High Dynamic Range Down Mixers
High Linearity Dual Mixers
Broadband Dual Mixer
Ultrahigh OIP3 I/Q Modulator
Direct Conversion I/Q Demodulator
COMMENTS
VCO LM(OUT) = –141dBc/Hz at fRF = 900MHz, fOFFSET = 1MHz
8dB Conversion Gain, 26.4dBm IIP3, 9.6dB NF, 600MHz to 4GHz
600MHz to 4.5GHz, 8.5dB Gain, 26.2dBm IIP3, 9.9dB NF
300MHz to 4GHz, 26.8dBm IIP3, 2dB Gain, 11.7dB NF, 600mW Power
200MHz to 6GHz, 31dBm OIP3, –160.6dBm/Hz Noise Floor
800MHz to 2.7GHz, 22.6dBm IIP3, 60dBm IIP2, 12.7dB NF
28 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
6945f
LT 1211 • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2011
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