LTC6946
3
6946fa
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TC = 25°C. VREF+ = VREF0+ = VD+ = VRF+ = 3.3V, VCP+ = VVCO+ = 5V unless otherwise
specified (Note 2). All voltages are with respect to GND.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Reference Inputs (REF+, REF–)
fREF
Input Frequency
l
10
250
MHz
VREF
Input Signal Level
Single Ended
l
0.5
2
3.3
VP-P
Input Slew Rate
l
20
V/μs
Input Duty Cycle
50
%
Self-Bias Voltage
l
1.65
1.85
2.25
V
Input Resistance
Differential
l
6.2
8.4
11.6
kΩ
Input Capacitance
Differential
3
pF
Reference Output (REFO)
fREFO
Output Frequency
l
10
250
MHz
PREFO
Output Power
fREFO = 10MHz, RLOAD = 50Ω
l
–0.2
3.2
dBm
Output Impedance, Disabled
800
Ω
VCO
fVCO
Frequency Range
LTC6946-1 (Note 3)
LTC6946-2 (Note 3)
LTC6946-3 (Note 3)
l
2.240
3.080
3.840
3.740
4.910
5.790
GHz
KVCO
Tuning Sensitivity
LTC6946-1 (Notes 3, 4)
LTC6946-2 (Notes 3, 4)
LTC6946-3 (Notes 3, 4)
4.7 to 7.2
4.7 to 7.0
4.0 to 6.0
%Hz/V
RF Output (RF+, RF–)
fRF
Output Frequency
l
0.373
5.790
GHz
O
Output Divider Range
All Integers Included
l
16
Output Duty Cycle
50
%
Output Resistance
Single Ended, Each Output to VRF+
l
111
136
159
Ω
Output Common Mode Voltage
l
2.4
VRF+
V
PRF(SE)
Output Power, Single Ended,
fRF = 900MHz
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
l
–9.7
–6.8
–3.9
–1.2
–6.0
–3.6
–0.4
2.3
dBm
Output Power, Muted
RZ = 50Ω, Single Ended, fRF = 900MHz, O = 2 to 6 l
–60
dBm
Mute Enable Time
l
110
ns
Mute Disable Time
l
170
ns
Phase/Frequency Detector
fPFD
Input Frequency
l
100
MHz
Lock Indicator, Available on the STAT Pin and via the SPI-Accessible Status Register
tLWW
Lock Window Width
LKWIN[1:0] = 0
LKWIN[1:0] = 1
LKWIN[1:0] = 2
LKWIN[1:0] = 3
3.0
10.0
30.0
90.0
ns
tLWHYS
Lock Window Hysteresis
Increase in tLWW Moving from Locked State to
Unlocked State
22
%
Charge Pump
ICP
Output Current Range
12 Settings (See Table 5)
0.25
11.2
mA
Output Current Source/Sink Accuracy
All Settings VCP = VCP+/2
±6
%
Output Current Source/Sink Matching
ICP = 250μA to 1.4mA, VCP = VCP+/2
ICP = 2.0mA to 11.2mA, VCP = VCP+/2
±3.5
±2
%