LTC6948IUFD-3 查看數據表（PDF） - Linear Technology
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LTC6948IUFD-3
Linear Technology
LTC6948IUFD-3 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.
LTC6948-1 Spurious Response
fRF = 891.85MHz, fREF = 100MHz,
fPFD = 25MHz, Loop BW = 74kHz
0
RBW = 10Hz
–20
VBW = 10Hz
INTN = 0
CPLE = 1
–40 O = 3
NOTES 8, 14
–60
–80
–100
–103dBc
–100dBc
LTC6948-3 Spurious Response
fRF = 2377.73MHz, fREF = 61.44MHz,
fPFD = 61.44MHz, Loop BW = 180k
0
RBW = 100Hz
–20
VBW = 100Hz
INTN = 0
CPLE = 1
–40 O = 2
NOTES 9, 14
–60
–80 –91dBc –78dBc
–78dBc –96dBc
–100
LTC6948-4 Spurious Response
fRF = 6236MHz, fREF = 100MHz,
fPFD = 50MHz, Loop BW = 152kHz
0
RBW = 100Hz
–20
VBW = 100Hz
INTN = 0
CPLE = 1
–40 O = 1
NOTES 8, 14
–60
–72dBc
–80
–70dBc
–100
–120
–120
–120
–140
–100 –75 –50 –25 0 25 50 75 100
FREQUENCY OFFSET (MHz IN 10kHz SEGMENTS)
6948 G34
–140
–246 –184 –123–61.4 0 61.4 123 184 246
FREQUENCY OFFSET (MHz IN 10kHz SEGMENTS)
6948 G35
–140
–200 –150 –100 –50 0 50 100 150 200
FREQUENCY OFFSET (MHz IN 10kHz SEGMENTS)
6948 G36
Integer Boundary Spur Power vs
Output Frequency, LTC6948-3
–40
SPUR IN BAND
–45 fPFD = 50MHz
CPLE = 1
O=1
–50
O=2
–55
O=3
O=4
–60 O =5
O=6
–65
–70
–75
–80
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
OUTPUT FREQUENCY (GHz)
6948 G37
VD+ Supply Current vs LDOV, fPFD
(INTN = 0, PDFN = 0)
20
TC = 25°C
18
16
LDOV = 3
14
12
LDOV = 2
10
8
LDOV = 1
6
LDOV = 0
4
2 LDOEN = 0
0
5 15 25 35 45 55 65 75
fPFD (MHz)
6948 G39
LTC6948-4 Supply Current
92
39
91
EXCLUDES VD+
38
90
37
89
36
88
35
87
34
86
33
85
32
84
83
–40 –20 0
O = 1, MUTE = 0
31
RFO = 3, ICP = 5.6mA 30
20 40 60 80 100
TJ (°C)
6948 G38
VD+ Supply Current vs LDOV,
Temperature
(INTN = 0, PDFN = 0, fPFD Noted)
20
LDOEN = 0, 75MHz
18
16
LDOV = 3, 65MHz
14
12
LDOV = 2, 55MHz
10
8
LDOV = 1, 45MHz
6
4
–40 –20 0
LDOV = 0, 30MHz
20 40 60 80 100
TJ (°C)
6948 G40
6948f
10
For more information www.linear.com/LTC6948
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