sy89538l Micrel Semiconductor, sy89538l Datasheet - Page 18

• Manufacturer Part Number: sy89538l
• Description: Sy89538l 3.3v Precision Lvpecl And Lvds Programmable Multiple Output Bank Clock
• Manufacturer: Micrel Semiconductor

PLL Loop Stability
For the loop filter configurations shown in Figure 4,
Table 10 below summarizes the PLL’s loop stability in
terms of damping factor, natural frequency, and
bandwidth, and illustrates the pole and zero cutoff
Note:
1. Feedback divider = 168 = 42 (6-bit programmable divider) x divide-by-2 x divide-by-2. Reference Frequency = 14, 16, and 18MHz.
January 2008
Parameter
Vcc
RM Temperature
Die Temperature
VCO Frequency
Charge Pump
Current
Loop Filter
Resistor
Zero Capacitor
Pole Capacitor
VCO Gain
(KVCO)
Feedback Divider
Phase Detector
Frequency
Damping Factor
Natural
Frequency
Ratio=Phase
Detector Freq / Fc
3.20E+09
13600.29
1.80E-04
4.70E-07
1.00E-10
2352
513
168
-40
-18
1.0
50
14
3
4.50E+09
16127.95
1.80E-04
4.70E-07
1.00E-09
2800
168
417
-40
-18
1.2
50
16
3
4.50E+09
1.80E-04
1.00E-09
16127.95
4.70E-07
3024
168
469
-40
-18
1.2
50
18
3
Table 10. PLL Loop Stability
2.80E+09
12721.90
1.80E-04
4.70E-07
1.00E-09
2352
168
586
3.3
0.9
25
55
50
14
18
3.30E+09
13811.16
1.80E-04
4.70E-07
1.00E-09
2800
168
568
3.3
1.0
25
55
50
16
frequencies determined by the loop filter when the
SY89538L is driven by a 14MHz to 18MHz crystal
when the feedback divider is effectively 168.
3.10E+09
1.80E-04
4.70E-07
1.00E-09
13386.09
3024
168
681
3.3
1.0
(1)
25
55
50
18
2.30E+09
11530.20
1.80E-04
4.70E-07
1.00E-09
[e-mail]
2352
125
168
714
3.6
0.9
85
50
14
1.70E+09
1.80E-04
4.70E-07
1.00E-09
9912.83
2800
1103
125
168
3.6
0.7
85
50
16
1.30E+09
4.70E-07
1.00E-09
1.80E-04
8668.52
or [phone]
M9999-010808-E
3024
1623
125
168
3.6
0.6
85
50
18
Integer
Ohms
Units
MHz
Hz/V
MHz
Hz
V
C
C
A
F
F