Datasheet

LTC6946
7
6946fa
TYPICAL PERFORMANCE CHARACTERISTICS
T
C
= 25°C, V
REF
+
= V
REFO
+
= V
D
+
= V
RF
+
= 3.3V, V
CP
+
= V
VCO
+
= 5V, RFO[1:0] = 3,unless otherwise noted.
LTC6946-1 VCO Tuning Sensitivity LTC6946-2 VCO Tuning Sensitivity LTC6946-3 VCO Tuning Sensitivity
RF Output HD3 vs Output Divide
(Single Ended on RF
–
)
MUTE Output Power vs f
VCO
and
Output Divide (Single Ended on RF
–
)
LTC6946-3 Frequency Step
Transient vs CPCHI/LO
LTC6946-1 VCO Phase Noise LTC6946-2 VCO Phase Noise LTC6946-3 VCO Phase Noise
f
VCO
(GHz)
3.75
–40
HD3 (dBc)
–35
–30
–25
–20
4.25 4.75
5.25
5.75
6946 G10
–15
–10
–5
4.00 4.50
5.00
5.50
LTC6946-3
L
C
= 68nH
C
S
= 100pF
f
RF
= f
VCO
/O
O = 6
O = 3
O = 2
O = 1
O = 5O = 4
f
VCO
(MHz)
3800 4050
P
OUT
AT f
VCO
/O (dBm)
–70
–60
–50
5300 5550
6946 G11
–80
–90
4300 4550 4800 5050 5800
–100
–110
–40
LTC6946-3, L
C
= 68nH
C
S
= 100pF, f
RF
= f
VCO
/O
O = 1
O = 4
O = 6
O = 5
O = 2
O = 3
TIME (μs)
0
2.55
FREQUENCY (GHz)
2.60
2.65
2.70
2.75
2.80
2.85
50 100 150 200
6946 G12
250
CALIBRATIION
TIME
CPCHI,
CPCLO = 0
CPCHI,
CPCLO = 1
f
PFD
= 1MHz
f
CAL
= 125kHz
BW = 40kHz
100MHz STEP
FREQUENCY (MHz)
2100
3.0
K
VCO
(%Hz/V)
3.5
4.5
5.0
5.5
8.0
6.5
2600
3100
6946 G13
4.0
7.0
7.5
6.0
3600
4100
FREQUENCY (MHz)
2800
3.0
K
VCO
(%Hz/V)
3.5
4.5
5.0
5.5
8.0
6.5
3300
3800 4300
6946 G14
4.0
7.0
7.5
6.0
4800
5300
FREQUENCY (MHz)
3500
2.5
K
VCO
(%Hz/V)
3.0
4.0
4.5
5.0
5500
7.0
6946 G15
3.5
4500
4000
6000
5000 6500
5.5
6.0
6.5
OFFSET FREQUENCY (Hz)
1k
–100
PHASE NOISE (dBc/Hz)
–90
–80
–70
–60
100k10k 1M
10M 40M
6946 G16
–110
–130
–150
–120
–140
–160
–50
–40
f
VCO
= f
RF
= 3GHz
OFFSET FREQUENCY (Hz)
1k
–100
PHASE NOISE (dBc/Hz)
–90
–80
–70
–60
100k10k 1M
10M 40M
6946 G17
–110
–130
–150
–120
–140
–160
–50
–40
f
VCO
= f
RF
= 4GHz
OFFSET FREQUENCY (Hz)
1k
–100
PHASE NOISE (dBc/Hz)
–90
–80
–70
–60
100k10k 1M
10M 40M
6946 G18
–110
–130
–150
–120
–140
–160
–50
–40
f
VCO
= f
RF
= 5GHz