LTC6948-2 查看數據表（PDF） - Linear Technology
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LTC6948-2
Linear Technology
LTC6948-2 Datasheet PDF : 36 Pages
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LTC6948
Typical Performance Characteristics TA = 25°C. VREF+ = VD+ = VRF+ = 3.3V, VCP+ = VVCO+ =
5V, INTN = 0, DITHEN = 1, CPLE = 1, RFO[1:0] = 3, unless otherwise noted.
LTC6948-4 VCO Tuning Sensitivity
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
4.3 4.7 5.1 5.5 5.9 6.3 6.7
FREQUENCY (GHz)
6948 G16
Normalized In-Band Phase Noise
Floor vs fVCO
–222
ICP = 5.6mA
CPLE = 1
–223
–224
–225
–226
FRACTIONAL-N
INTEGER-N
–227
2
3
4
5
fVCO (GHz)
6
6948 G17
Normalized In-Band Phase Noise
Floor vs CP Current
–222
fVCO = 5GHz
CPLE = 1
–223
–224
–225
FRACTIONAL-N
–226
–227
1
INTEGER-N
3
5
7
ICP (mA)
9
11
6948 G18
LTC6948-1 VCO Phase Noise
–40
–50
fRF = fVCO = 3GHz
–60
–70
–80
–90
–100
–110
–120
–130
–140
–150
–160
1k
10k
100k
1M
10M 40M
OFFSET FREQUENCY (Hz)
6948 G19
LTC6948-4 VCO Phase Noise
–40
–50
fRF = fVCO = 6GHz
–60
–70
–80
–90
–100
–110
–120
–130
–140
–150
–160
1k
10k
100k
1M
10M 40M
OFFSET FREQUENCY (Hz)
6948 G22
8
LTC6948-2 VCO Phase Noise
–40
–50
fRF = fVCO = 4GHz
–60
–70
–80
–90
–100
–110
–120
–130
–140
–150
–160
1k
10k
100k
1M
10M 40M
OFFSET FREQUENCY (Hz)
6948 G20
LTC6948-1 VCO Phase Noise vs
fVCO, Output Divide
(fOFFSET = 10kHz)
–75
fRF = fVCO/O
O=1
–80
O=2
–85
O=3
–90
–95
O=6
–100
O=4
O=5
–105
2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8
fVCO (GHz)
6948 G23
For more information www.linear.com/LTC6948
LTC6948-3 VCO Phase Noise
–40
–50
fRF = fVCO = 5GHz
–60
–70
–80
–90
–100
–110
–120
–130
–140
–150
–160
1k
10k
100k
1M
10M 40M
OFFSET FREQUENCY (Hz)
6948 G21
LTC6948-2 VCO Phase Noise vs
fVCO, Output Divide
(fOFFSET = 10kHz)
–70
fRF = fVCO/O
–75
O=1
–80
O=2
–85
O=3
–90
O=4
–95
O=6
O=5
–100
3.0 3.3 3.6 3.9 4.2 4.5 4.8
fVCO (GHz)
6948 G24
6948f
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