LTC6948IUFD-2 Просмотр технического описания (PDF) - Linear Technology
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LTC6948IUFD-2
Linear Technology
LTC6948IUFD-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.
LTC6948-3 VCO Phase Noise vs
fVCO, Output Divide
(fOFFSET = 10kHz)
–70
fRF = fVCO/O
–75
O=1
–80
O=2
–85
O=3
O=4
–90
–95
3.8
O=6 O=5
4.2 4.6 5.0
fVCO (GHz)
5.4 5.8
6948 G25
LTC6948-2 VCO Phase Noise vs
fVCO, Output Divide
(fOFFSET = 1MHz)
–125 fRF = fVCO/O
O=1
–130
–135
–140
O=2
O=3
O=4
O=6 O=5
–145
3.0 3.3 3.6 3.9 4.2 4.5 4.8
fVCO (GHz)
6948 G28
LTC6948-4 VCO Phase Noise vs
fVCO, Output Divide
(fOFFSET = 10kHz)
–70
fRF = fVCO/O
O=1
–75
O=2
–80
O=3
O=4
–85
O=5
–90
O=6
–95
4.3 4.7 5.1 5.5 5.9 6.3 6.7
fVCO (GHz)
6948 G26
LTC6948-3 VCO Phase Noise vs
fVCO, Output Divide
(fOFFSET = 1MHz)
–120
fRF = fVCO/O
–125
O=1
–130
O=2
–135 O = 3
O=4
–140
–145
3.8
O=6
4.2 4.6 5.0
fVCO (GHz)
O=5
5.4 5.8
6948 G29
LTC6948-1 VCO Phase Noise vs
fVCO, Output Divide
(fOFFSET = 1MHz)
–125
fRF = fVCO/O
–130
O=1
–135
O=2
–140
O=3
O=4
–145
O=6
O=5
–150
2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8
fVCO (GHz)
6948 G27
LTC6948-4 VCO Phase Noise vs
fVCO, Output Divide
(fOFFSET = 1MHz)
–120
fRF = fVCO/O
O=1
–125
–130
–135
O=2
O=3
O=4
–140
O=6
O=5
–145
4.3 4.7 5.1 5.5 5.9 6.3 6.7
fVCO (GHz)
6948 G30
Closed-Loop Phase Noise,
LTC6948-1 fRF = 891.857MHz
–90
–100
–110
–120
–130
RMS NOISE = 0.074°
fPFD = 25MHz
O=3
–140 INTN = 0
CPLE = 1
–150 fIB-SPUR = 572kHz
LOOP BW = 73kHz
NOTES 8, 13
–160
100 1k 10k 100k 1M
OFFSET FREQUENCY (Hz)
10M 40M
6948 G31
Closed-Loop Phase Noise,
LTC6948-3 fRF = 2377.728MHz
–90
–100
–110
–120
–130 RMS NOISE = 0.141°
fPFD = 61.44MHz
–140 O = 2
INTN = 0
–150 CPLE = 1
LOOP BW = 180kHz
NOTES 9, 12
–160
100 1k 10k 100k 1M
OFFSET FREQUENCY (Hz)
10M 40M
6948 G32
For more information www.linear.com/LTC6948
Closed-Loop Phase Noise,
LTC6948-2 fRF = 3646.464MHz
–90
–100
–110
–120
–130 RMS NOISE = 0.224°
fPFD = 61.44MHz
–140 O = 1
INTN = 0
–150 CPLE = 1
LOOP BW = 178kHz
NOTE 9
–160
100 1k
10k 100k 1M
OFFSET FREQUENCY (Hz)
10M 40M
6948 G33
6948f
9
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