Datasheet
LTC6946
8
6946fa
LTC6946-1 VCO Phase Noise vs f
VCO
,
Output Divide (f
OFFSET
= 1MHz)
Closed-Loop Phase Noise, Loop
Bandwidth = 40kHz, LTC6946-1
LTC6946-1 VCO Phase Noise vs f
VCO
,
Output Divide (f
OFFSET
= 10kHz)
LTC6946-2 VCO Phase Noise vs f
VCO
,
Output Divide (f
OFFSET
= 10kHz)
LTC6946-2 VCO Phase Noise vs f
VCO
,
Output Divide (f
OFFSET
= 1MHz)
Closed-Loop Phase Noise, Loop
Bandwidth = 25kHz, LTC6946-3
LTC6946-3 VCO Phase Noise vs f
VCO
,
Output Divide (f
OFFSET
= 10kHz)
LTC6946-3 VCO Phase Noise vs f
VCO
,
Output Divide (f
OFFSET
= 1MHz)
LTC6946-2 Supply Current
vs Temperature
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.
f
VCO
(MHz)
2200
–105
PHASE NOISE (dBc/Hz)
–100
–95
–90
–85
–75
2450
2700 2950 3200
6946 G19
3450 3700
–80
f
RF
= f
VCO
/O
O = 1
O = 2
O = 3
O = 6O = 5O = 4
f
VCO
(MHz)
3000
–100
PHASE NOISE (dBc/Hz)
–95
–90
–85
–80
–70
3250
3500 3750 4000 4250
6946 G20
4500 4750
–75
f
RF
= f
VCO
/O
O = 1
O = 2
O = 3
O = 6
O = 5
O = 4
f
VCO
(MHz)
3800
PHASE NOISE (dBc/Hz)
–80
–75
–70
4550 5050 5800
6946 G21
–85
–90
–95
4050 4300
4800
5300 5550
f
RF
= f
VCO
/O
O = 1
O = 2
O = 3
O = 4
O = 6 O = 5
f
VCO
(MHz)
2200
–150
PHASE NOISE (dBc/Hz)
–145
–140
–135
–125
2450
2700 2950 3200
6946 G22
3450 3700
–130
f
RF
= f
VCO
/O
O = 1
O = 2
O = 3
O = 6
O = 4
O = 5
f
VCO
(MHz)
3000
–150
PHASE NOISE (dBc/Hz)
–145
–140
–135
–125
3250
3500 3750 4000 4250
6946 G23
4500 4750
–130
f
RF
= f
VCO
/O
f
OFFSET
= 1MHz
O = 1
O = 2
O = 3
O = 6
O = 5
O = 4
f
VCO
(MHz)
3800
PHASE NOISE (dBc/Hz)
–130
–125
–120
4550 5050 5800
6946 G24
–135
–140
–145
4050 4300
4800
5300 5550
f
RF
= f
VCO
/O
O = 1
O = 2
O = 3
O = 4
O = 6
O = 5
OFFSET FREQUENCY (Hz)
–140
PHASE NOISE (dBc/Hz)
–130
–110
–90
100 10k 100k 10M 40M
6946 G25
–150
1k
1M
–100
–120
–160
RMS NOISE = 0.169°
f
RF
= 900MHz
f
PFD
= 1MHz
OD = 3
f
STEP
= 333.3kHz
NOTE 12
OFFSET FREQUENCY (Hz)
–140
PHASE NOISE (dBc/Hz)
–130
–110
–90
100 10k 100k 10M 40M
6946 G26
–150
1k
1M
–100
–120
–160
RMS NOISE = 0.276°
f
RF
= 900MHz
f
PFD
= 250kHz
OD = 5
f
STEP
= 50kHz
NOTE 11
T
C
(°C)
–40
80
3.3V CURRENT (mA)
5V CURRENT (mA)
82
84
86
–20
0
20 40
6946 G27
60
88
90
81
83
85
87
89
45
47
49
51
53
55
46
48
50
52
54
80 100
PDREFO = 1
O = 1
RFO = 3
MUTE = 0
I
CP
= 11.2mA