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LTC6948 View Datasheet(PDF) - Linear Technology

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Description
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LTC6948 Datasheet PDF : 36 Pages
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LTC6948
Electrical Characteristics The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C. VREF+ = VD+ = VRF+ = 3.3V, VCP+ = VVCO+ = 5V unless otherwise
specified (Note 2). All voltages are with respect to GND.
SYMBOL
PARAMETER
Reference Inputs (REF+, REF)
fREF
Input Frequency
VREF
Input Signal Level
Input Slew Rate
Input Duty Cycle
Self-Bias Voltage
Input Resistance
Input Capacitance
VCO
fVCO
Frequency Range
KVCO
Tuning Sensitivity
RF Output (RF+, RF)
fRF
Output Frequency
O
Output Divider Range
CONDITIONS
MIN
TYP
MAX UNITS
l 10
425
MHz
Single-Ended, 1µF AC-Coupling Capacitors l 0.5
2
2.7
VP-P
l 20
V/µs
50
%
l 1.65
1.85
2.25
V
Differential
l 5.8
8.4
11.6
Differential
14
pF
LTC6948-1 (Note 3)
LTC6948-2 (Note 3)
LTC6948-3 (Note 3)
LTC6948-4 (Note 3)
LTC6948-1 (Notes 3, 4)
LTC6948-2 (Notes 3, 4)
LTC6948-3 (Notes 3, 4)
LTC6948-4 (Notes 3, 4)
l 2.24
3.74
l 3.08
4.91
l 3.84
5.79
l 4.20
6.39
l
4.7 to 7.2
l
4.7 to 7.0
l
4.0 to 6.0
l
4.5 to 6.5
GHz
GHz
GHz
GHz
%Hz/V
%Hz/V
%Hz/V
%Hz/V
All Integers Included
l 0.373
l1
6.39
GHz
6
PRF-SE
Output Duty Cycle
Output Resistance
Output Power, Single-Ended, fRF = 900MHz
Output Power, Muted, fRF = 900MHz
Mute Enable Time
Single-Ended, Each Output to VRF+
RFO[1:0] = 0, RZ = 50Ω, LC Match
RFO[1:0] = 1, RZ = 50Ω, LC Match
RFO[1:0] = 2, RZ = 50Ω, LC Match
RFO[1:0] = 3, RZ = 50Ω, LC Match
RZ = 50Ω, Single-Ended, O = 2 to 6
50
%
l 100
136
175
Ω
l –9
–7.3
–5.5
dBm
l –6.1
–4.5
–2.8
dBm
l –2.9
–1.4
0.2
dBm
l 0.1
1.5
3
dBm
l
–80
dBm
l
110
ns
Mute Disable Time
Phase/Frequency Detector
fPFD
Input Frequency
Charge Pump
l
Integer mode
l
Fractional mode
LDOEN = 0
l
LDOV = 3, LDOEN = 1
l
LDOV = 2, LDOEN = 1
l
LDOV = 1, LDOEN = 1
l
LDOV = 0, LDOEN = 1
l
170
ns
100
MHz
76.1
MHz
66.3
MHz
56.1
MHz
45.9
MHz
34.3
MHz
ICP
Output Current Range
8 Settings (See Table 6)
1
Output Current Source/Sink Accuracy
All Settings, V(CP) = VCP+/2
Output Current Source/Sink Matching
ICP
ICP
=
=
1.0mA
4.0mA
to
to
21.18.m2mAA, V, V(C(CPP) )==VVCPC+P/+2/2
11.2
mA
±6
%
±3.5
%
±2
%
Output Current vs Output Voltage Sensitivity (Note 5)
l
0.2
1
%/V
Output Current vs Temperature
V(CP) = VCP+/2
l
170
ppm/°C
Output Hi-Z Leakage Current
ICP = 11.2mA, CPCLO = CPCHI = 0 (Note 5)
0.03
nA
6948f
For more information www.linear.com/LTC6948
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