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LTC6945 Datasheet(PDF) 25 Page - Linear Technology

Part # LTC6945
Description  Ultralow Noise and Spurious 0.35GHz to 6GHz Integer-N Synthesizer
PDF  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC6945 Datasheet(HTML) 25 Page - Linear Technology

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LTC6945
25
6945fa
For more information www.linear.com/LTC6945
LTC6945 Wideband Frequency Hopping Local Oscillator
Typical applicaTions
Frequency Hopping
LOOUT Frequency,
LO1 = 450MHz, LO2 = 700MHz
TIME (µs)
–0.6
3
450
0
0.4
6945 TA02b
2
1
0
–0.4
–0.2
0.2
550
650
750
0.6
MUTE1
MUTE2
Frequency Hopping
LOOUT Power,
LO1 = 450MHz, LO2 = 700MHz
Frequency Hopping
LOOUT Spectrum,
LO1 = 450MHz Muted,
LO2 = 700MHz
FREQUENCY (MHz)
400
–80
–20
–10
0
500
600 650
6945 TA02d
–100
–40
–60
–90
–30
–110
–50
–70
450
550
700 750
fPFD = 1MHz
OD = 2
–95dBc
VVCO+
GND
GND
GND
GND
GND
VCO+
VCO–
VREFO+
REFO
STAT
CS
SCLK
SDI
SDO
VD+
MUTE GND RF–
GND
LTC6945
O_DIV = 2
RF+ VRF+ BB
REF–
3.3V
0.1µF
100MHz
REF
REF+ VREF+ CP VCP+ GND
0.01µF
100pF
700MHz TO 1400MHz
1.0µF
22nF
LT1678IS8
274
4.99k
4.99k
267nF
1µF
0.1µF
0.1µF
47µF
1µF
3.3V
3.3V
SPI BUS
MUTE1
0.1µF
0.01µF
180nH
180nH
3.3V
3.3V
3.3V
0V
3.3V
MUTE1
MUTE2
0V
3.3V
270pF
50
270pF
13.3nF
12V RFMD
UMS-1400-A16-G
100pF
5V
0.1µF
0.1µF
LOOP BANDWIDTH = ~7.6kHz
14V
5V
3.3V
100
VTUNE
+
–
VVCO+
GND
GND
GND
GND
GND
VCO+
VCO–
VREFO+
REFO
STAT
CS
SCLK
SDI
SDO
VD+
MUTE GND RF–
GND
LTC6945
O_DIV = 2
RF+ VRF+ BB
REF–
3.3V
0.1µF
51.1
REF+ VREF+ CP VCP+ GND
0.01µF
100pF
700MHz TO 1400MHz
1.0µF
22nF
LT1678IS8
274
4.99k
4.99k
267nF
1µF
0.1µF
0.1µF
47µF
1µF
3.3V
3.3V
SPI BUS
MUTE2
0.1µF
0.01µF
180nH
180nH
3.3V
3.3V
POWER
COMBINER
3.3V
100ns
270pF
50
270pF
1
2
S
LO OUT
6945 TA02a
LO2 = 350MHz TO 700MHz
LO1 = 350MHz TO 700MHz
13.3nF
12V RFMD
UMS-1400-A16-G
100pF
5V
0.1µF
0.1µF
LOOP BANDWIDTH = ~7.6kHz
14V
5V
3.3V
100
VTUNE
+
–
TIME (µs)
–0.6
3
–5.0
0
0.4
6945 TA02c
2
1
0
–0.4
–0.2
0.2
–4.5
–4.0
–3.5
0.6
MUTE1
MUTE2



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