Datasheet

LTC6945
7
6945f
TYPICAL PERFORMANCE CHARACTERISTICS
Spurious Response
f
RF
= 914MHz, f
REF
= 10MHz,
f
PFD
= 250kHz, Loop BW = 7kHz
Spurious Response
f
RF
= 2100MHz, f
REF
= 10MHz,
f
PFD
= 1MHz, Loop BW = 40kHz
VCO Input Sensitivity
vs Frequency, Temperature
Closed-Loop Phase Noise,
f
RF
= 914MHz
Closed-Loop Phase Noise,
f
RF
= 2100MHz
FREQUENCY (GHz)
0
SENSITIVITY (dBm)
–15
–10
4
6945 G13
–20
–25
–30
–35
1
2
3
5
0.5 4.5
1.5
2.5
3.5
5.5
6
105°C
25°C
–40°C
Spurious Response
f
RF
= 5725MHz, f
REF
= 10MHz,
f
PFD
= 5MHz, Loop BW = 21kHz Supply Current vs Temperature
FREQUENCY OFFSET (MHz, IN 10kHz SEGMENTS)
–10 –3 –2 –1 0 21310
–140
P
OUT
(dBm)
–120
–80
–60
–113dBc –112dBc
–102dBc –102dBc
–40
0
6945 G17
–100
–20
RBW = 1Hz
VBW = 1Hz
NOTES 7, 11
FREQUENCY OFFSET (MHz, IN 10kHz SEGMENTS)
–20 –15 –10 –5 0 1051520
–140
P
OUT
(dBm)
–120
–80
–60
–112dBc –112dBc
–100dBc –101dBc
–40
0
6945 G18
–100
–20
RBW = 1Hz
VBW = 1Hz
NOTES 7, 11
FREQUENCY OFFSET (MHz, IN 10kHz SEGMENTS)
–10 –0.75 –0.5 –0.25 0 0.50.25 0.75 10
–140
P
OUT
(dBm)
–120
–80
–60
–113dBc –111dBc
–102dBc –102dBc
–40
0
6945 G16
–100
–20
RBW = 1Hz
VBW = 1Hz
NOTES 7, 10, 11
TEMPERATURE (°C)
–40
3.3V CURRENT (mA)
5V CURRENT (mA)
83
84
85
40 60
100
6945 G19
82
81
80
–20 0 20 80
86
87
88
33.0
33.5
34.0
32.5
32.0
31.5
34.5
35.0
35.5
PDREFO = 1
O = 1
RFO = 3
MUTE = 0
I
CP
= 11.2mA
OFFSET FREQUENCY (Hz)
–150
PHASE, NOISE (dBc/Hz)
–140
–120
–100
–90
100 10k 100k
6945 G14
–160
1k
1M 10M 40M
–110
–130
–170
RMS NOISE = 0.13°
f
PFD
= 250kHz
BW = 7kHz
NOTES 7, 10
VCO = CRYSTEK
CVCO55CL-0902-0928
OFFSET FREQUENCY (Hz)
–150
PHASE, NOISE (dBc/Hz)
–140
–120
–100
–90
100 10k 100k
6945 G15
–160
1k
1M 10M 40M
–110
–130
–170
RMS NOISE = 0.33°
f
PFD
= 1MHz
BW = 40kHz
NOTE 7
VCO = RFMD
UMX-586-D16-G