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Philips Semiconductors
1.3GHz low voltage fractional-N synthesizer
1500
1000
500
0
I
= 51.67 A
SET
–500
I
= 103.33 A
SET
I
= 165.33 A
SET
–1000
I
= 206.67 A
SET
–1500
0
0.25 0.5 0.75
1
1.25
COMPLIANCE VOLTAGE (V)
Figure 15. Php–su Charge Pump Output vs. I
(CP = 1; TEMP = 25 C)
0
V
= 5.50 V
–5
DD
V
= 3.75 V
–10
DD
V
= 3.00 V
–15
DD
–20
V
= 2.70 V
DD
–25
–30
–35
–40
–45
–50
–55
–60
0
200
400
600
800
FREQUENCY (MHz)
Figure 17. Main Divider Input Sensitivity vs. Frequency and
Supply Voltage (TEMP = 25 C)
0
–5
–10
–15
–20
–25
–30
–35
–40
–45
–50
–55
0
5
10
15
20
25
30
FREQUENCY (MHz)
Figure 19. Reference Divider Input Sensitivity vs. Frequency
and Supply Voltage (TEMP = 25 C)
1999 Nov 04
I
= 206.67 A
SET
I
= 165.33 A
SET
I
= 103.33 A
SET
I
= 51.67 A
SET
1.5
1.75
2
2.25 2.5 2.75
3
SR01917
SET
1000 1200 1400 1600
1800 2000
SR01929
V
= 5.00 V
DD
V
= 3.75 V
DD
V
= 3.00 V
DD
V
= 2.70 V
DD
35
40
45
50
55
60
65
70
SR01921
1000
800
600
400
200
0
–200
–400
–600
–800
–1000
0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5 2.75 3 3.25 3.5
COMPLIANCE VOLTAGE (V)
Figure 16. Php–su Charge Pump Output vs. Temperature
(CP = 1; V
= 3.0 V; I
DD
0
–5
–10
–15
–20
–25
–30
–35
–40
–45
–50
0
200
400
600
Figure 18. Main Divider Input Sensitivity vs. Frequency and
Temperature (V
0
–5
–10
–15
–20
–25
–30
–35
–40
–45
–50
–55
0
5
10
15
20
25
FREQUENCY (MHz)
Figure 20. Reference Divider Input Sensitivity vs. Frequency
and Temperature (V
14
Product specification
SA7016
TEMP = 85 C
TEMP = 25 C
TEMP = –40 C
SR01918
= 165.33 A)
SET
+85 C
+25 C
–40 C
800
1000
1200
1400
1600
1800
FREQUENCY (MHz)
SR01930
= 3.00 V)
DD
TEMP = +85 C
TEMP = +25 C
TEMP = –40 C
30
35
40
45
50
55
60
65
SR01922
= 3.00 V)
DD
2000
70
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