Datasheet

LTC6945
6
6945f
Charge Pump Sink Current Error
vs Voltage, Output Current
Charge Pump Sink Current Error
vs Voltage, Temperature
Charge Pump Source Current
Error vs Voltage, Output Current
TYPICAL PERFORMANCE CHARACTERISTICS
Charge Pump Source Current
Error vs Voltage, Temperature
RF Output Power vs Frequency
(Single-Ended On RF
–
)
RF Output HD2 vs Output Divide
(Single-Ended On RF
–
)
RF Output HD3 vs Output Divide
(Single-Ended On RF
–
)
MUTE Output Power
vs f
VCO
and Output Divide
(Single-Ended On RF
–
) Frequency Step Transient
OUTPUT VOLTAGE (V)
0
ERROR (%)
1
3
5
4
6945 G05
–1
–3
0
2
4
–2
–4
–5
10.5
21.5
3 3.5 4.5
2.5
5
105°C
25°C
–40°C
I
CP
= 11.2mA
OUTPUT VOLTAGE (V)
0
ERROR (%)
1
3
5
4
6945 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
6945 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
6945 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
–3.5
P
OUT
(dBm)
–3.0
–2.0
–1.5
–1.0
3 3.5 4 54.5 5.5
1.0
6945 G08
–2.5
0.5 1 1.5 2 2.5 6
–0.5
0
0.5
105°C
25°C
–40°C
P
VCO
= 0dBm
L
C
= 180nH
C
S
= 270pF
TIME (μs)
0
1.85
FREQUENCY (GHz)
1.90
2.00
2.05
2.10
10
20
25 45
6945 G12
1.95
515
30
35
40
f
PFD
= 1MHz
BW = 40kHz
100MHz STEP
f
VCO
(GHz)
0
HD3 (dBc)
–15
–10
–5
4
6945 G10
–20
–25
–30
1
2
3
5
0.5 4.5
1.5
2.5
3.5
5.5
6
f
RF
= f
VCO
/O
P
VCO
= 0dBm
L
C
= 180nH
C
S
= 270pF
O = 6
O = 3
O = 2
O = 1
f
VCO
(GHz)
0
–120
P
OUT
AT f
VCO
/O (dBm)
–110
–90
–80
–70
3 3.5 4 54.5 5.5
–30
6945 G11
–100
0.5 1 1.5 2 2.5 6
–60
–50
–40
f
RF
= f
VCO
/O
P
VCO
= 0dBm
L
C
= 180nH
C
S
= 270pF
O = 1
O = 2
O = 3
O = 4
O = 5
O = 6
f
VCO
(GHz)
0
–55
HD2 (dBc)
–50
–40
–35
–30
3 3.5 4 54.5 5.5
–20
6945 G09
–45
0.5 1 1.5 2 2.5 6
–25
f
RF
= f
VCO
/O
P
VCO
= 0dBm
L
C
= 180nH
C
S
= 270pF
O = 3
O = 5
O = 1
O = 6
O = 2
O = 4