Datasheet

LTC6946
6
6946fa
TYPICAL PERFORMANCE CHARACTERISTICS
Charge Pump Sink Current Error
vs Voltage, Output Current
Charge Pump Source Current
Error vs Voltage, Temperature
Charge Pump Sink Current Error
vs Voltage, Temperature
RF Output Power vs Frequency
(Single Ended on RF
–
)
Charge Pump Source Current
Error vs Voltage, Output Current
RF Output HD2 vs Output Divide
(Single Ended on RF
–
)
REF Input Sensitivity
vs Frequency REF0 Output Power vs Frequency
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.
REFO Phase Noise
FREQUENCY (MHz)
0
SENSITIVITY (dBm)
–15
–20
–25
–30
–35
–40
–45
–50
–55
200
6946 G01
50 100 150 25017525 75 125 225
BST = 1
FILT = 0
105°C
25°C
–40°C
FREQUENCY (MHz)
0
P
OUT
(dBm)
4
3
2
1
0
–1
–2
–3
–4
200
6946 G02
50 100 150 25017525 75 125 225
105°C
25°C
–40°C
OFFSET FREQUENCY (Hz)
–155
PHASE NOISE (dBc/Hz)
–150
–145
–140
100 10k 100k 1M
6946 G03
–160
1k
P
OUT
= 1.45dBm
f
REF
= 10MHz
BST = 1
FILT = 3
NOTE 8
OUTPUT VOLTAGE (V)
0
ERROR (%)
1
3
5
4
6946 G04
–1
–3
0
2
4
–2
–4
–5
10.5
21.5
3 3.5 4.5
2.5
5
250μA
1mA
11.2mA
OUTPUT VOLTAGE (V)
0
ERROR (%)
1
3
5
4
6946 G05
–1
–3
0
2
4
–2
–4
–5
10.5
21.5
3 3.5 4.5
2.5
5
–40°C
25°C
105°C
I
CP
= 11.2mA
OUTPUT VOLTAGE (V)
0
ERROR (%)
1
3
5
4
6946 G06
–1
–3
0
2
4
–2
–4
–5
10.5
21.5
3 3.5 4.5
2.5
5
250μA
1mA
11.2mA
OUTPUT VOLTAGE (V)
0
ERROR (%)
1
3
5
4
6946 G07
–1
–3
0
2
4
–2
–4
–5
10.5
21.5
3 3.5 4.5
2.5
5
–40°C
25°C
105°C
I
CP
= 11.2mA
FREQUENCY (GHz)
0.5
P
OUT
(dBm)
–2.5
0.5
1.0
1.5
1.5
3.53
4 4.5
6946 G08
–3.5
–0.5
–1.5
–3.0
0
–4.0
–1.0
–2.0
1
2 2.5
5 5.5
6
–40°C
25°C
105°C
LTC6946-3
L
C
= 68nH
C
S
= 100pF
f
VCO
(GHz)
3.75
–50
HD2 (dBc)
–45
–40
–35
–30
4.25 4.75
5.25
5.75
6946 G09
–25
–20
4.00 4.50
5.00
5.50
LTC6946-3, f
RF
= f
VCO
/O
L
C
= 68nH, C
S
= 100pF
O = 3
O = 2
O = 1
O = 6
O = 4
O = 5