LTC6945 - Ultralow Noise and Spurious 0.35GHz to 6GHz Integer-N ...

TYPICAL PERFORMANCE CHARACTERISTICS
SENSITIVITY (dBm)
–10
–15
–20
–25
VCO Input Sensitivity
vs Frequency, Temperature
–30
105°C
25°C
–35
–40°C
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
FREQUENCY (GHz)
P OUT (dBm)
P OUT (dBm)
0
–20
–40
–60
–80
–100
–120
0
–20
–40
–60
–80
–100
–120
6945 G13
Spurious Response
f RF = 914MHz, f REF = 10MHz,
f PFD = 250kHz, Loop BW = 7kHz
RBW = 1Hz
VBW = 1Hz
NOTES 7, 10, 11
–113dBc –111dBc
–140
–10 –0.75 –0.5 –0.25 0 0.25 0.5 0.75 10
FREQUENCY OFFSET (MHz, IN 10kHz SEGMENTS)
Closed-Loop Phase Noise,
f RF = 914MHz
Spurious Response
f RF = 2100MHz, f REF = 10MHz,
f PFD = 1MHz, Loop BW = 40kHz
Spurious Response
f RF = 5725MHz, f REF = 10MHz,
f PFD = 5MHz, Loop BW = 21kHz Supply Current vs Temperature
RBW = 1Hz
VBW = 1Hz
NOTES 7, 11
PHASE, NOISE (dBc/Hz)
–102dBc –102dBc
–100dBc –101dBc
–90
–100
–110
–120
–130
6945 G16
–112dBc –112dBc
–140
–20 –15 –10 –5 0 5 10 15 20
FREQUENCY OFFSET (MHz, IN 10kHz SEGMENTS)
–140
RMS NOISE = 0.13°
–150
fPFD = 250kHz
BW = 7kHz
–160
NOTES 7, 10
VCO = CRYSTEK
CVCO55CL-0902-0928
–170
100 1k 10k 100k 1M 10M 40M
OFFSET FREQUENCY (Hz)
6945 G18
P OUT (dBm)
3.3V CURRENT (mA)
0
–20
–40
–60
–80
–100
–120
RBW = 1Hz
VBW = 1Hz
NOTES 7, 11
–102dBc –102dBc
LTC6945
Closed-Loop Phase Noise,
f RF = 2100MHz
–113dBc –112dBc
–140
–10 –3 –2 –1 0 1 2 3 10
FREQUENCY OFFSET (MHz, IN 10kHz SEGMENTS)
88
87
86
85
84
83
82
81
80
–40
6945 G14
PDREFO = 1
O = 1
RFO = 3
MUTE = 0
ICP = 11.2mA
PHASE, NOISE (dBc/Hz)
–90
–100
–110
–120
–130
–140
RMS NOISE = 0.33°
–150
fPFD = 1MHz
BW = 40kHz
–160
NOTE 7
VCO = RFMD
UMX-586-D16-G
–170
100 1k 10k 100k 1M 10M 40M
OFFSET FREQUENCY (Hz)
6945 G17
31.5
–20 0 20 40 60 80 100
TEMPERATURE (°C)
6945 G19
35.5
35.0
34.5
34.0
33.5
33.0
32.5
32.0
5V CURRENT (mA)
6945 G15
6945f
7