LTC6945IUFDTRPBF Просмотр технического описания (PDF) - Linear Technology
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LTC6945IUFDTRPBF Datasheet PDF : 28 Pages
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TYPICAL PERFORMANCE CHARACTERISTICS
LTC6945
VCO Input Sensitivity
vs Frequency, Temperature
–10
Closed-Loop Phase Noise,
fRF = 914MHz
–90
Closed-Loop Phase Noise,
fRF = 2100MHz
–90
–100
–100
–15
–110
–110
–20
–120
–120
–130
–130
–25
–30
105°C
25°C
–40°C
–35
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
–140 RMS NOISE = 0.13°
–150
fPFD = 250kHz
BW = 7kHz
NOTES 7, 10
–160 VCO = CRYSTEK
CVCO55CL-0902-0928
–170
100 1k 10k 100k 1M
10M 40M
–140 RMS NOISE = 0.33°
–150
fPFD = 1MHz
BW = 40kHz
NOTE 7
–160 VCO = RFMD
UMX-586-D16-G
–170
100 1k 10k 100k 1M
FREQUENCY (GHz)
OFFSET FREQUENCY (Hz)
OFFSET FREQUENCY (Hz)
6945 G13
Spurious Response
fRF = 914MHz, fREF = 10MHz,
fPFD = 250kHz, Loop BW = 7kHz
6945 G14
Spurious Response
fRF = 2100MHz, fREF = 10MHz,
fPFD = 1MHz, Loop BW = 40kHz
0 RBW = 1Hz
–20
VBW = 1Hz
NOTES 7, 10, 11
0
RBW = 1Hz
–20
VBW = 1Hz
NOTES 7, 11
10M 40M
6945 G15
–40
–40
–60
–80
–100
–102dBc
–113dBc
–120
–102dBc
–111dBc
–60
–80
–100
–102dBc
–113dBc
–120
–102dBc
–112dBc
–140
–10 –0.75 –0.5 –0.25 0 0.25 0.5 0.75 10
FREQUENCY OFFSET (MHz, IN 10kHz SEGMENTS)
6945 G16
Spurious Response
fRF = 5725MHz, fREF = 10MHz,
fPFD = 5MHz, Loop BW = 21kHz
0
RBW = 1Hz
–20
VBW = 1Hz
NOTES 7, 11
–40
–60
–80
–100
–100dBc
–112dBc
–120
–101dBc
–112dBc
–140
–20 –15 –10 –5 0 5 10 15 20
FREQUENCY OFFSET (MHz, IN 10kHz SEGMENTS)
6945 G18
–140
–10 –3 –2 –1 0 1 2 3 10
FREQUENCY OFFSET (MHz, IN 10kHz SEGMENTS)
6945 G17
Supply Current vs Temperature
88
35.5
PDREFO = 1
87 O = 1
35.0
RFO = 3
86 MUTE = 0
34.5
ICP = 11.2mA
85
34.0
84
33.5
83
33.0
82
32.5
81
32.0
80
–40 –20
0 20 40 60
TEMPERATURE (°C)
31.5
80 100
6945 G19
6945f
7
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