LMK03002 Datasheet, PDF (19/39 Pages) National Semiconductor (TI) – Precision Clock Conditioner with Integrated VCO

LMK03002
www.ti.com
REGISTER R13
SNAS414E – AUGUST 2007 – REVISED APRIL 2013
VCO_C3_C4_LF[3:0] – Value for Internal Loop Filter Capacitors C3 and C4
These bits control the capacitor values for C3 and C4 in the internal loop filter.
VCO_C3_C4_LF[3:0]
0
1
2
3
4
5
6
7
8
9
10
11
12 to 15
C3 (pF)
0 (default)
0
50
0
50
100
0
50
100
100
150
150
Loop Filter Capacitors
Invalid
C4 (pF)
10 (default)
60
10
110
110
110
160
160
10
60
110
60
VCO_R3_LF[2:0] – Value for Internal Loop Filter Resistor R3
These bits control the R3 resistor value in the internal loop filter. The recommended setting for VCO_R3_LF[2:0]
= 0 for optimum phase noise and jitter.
VCO_R3_LF[2:0]
0
1
2
3
4
5 to 7
R3 Value (kΩ)
Low (~600 Ω) (default)
10
20
30
40
Invalid
VCO_R4_LF[2:0] – Value for Internal Loop Filter Resistor R4
These bits control the R4 resistor value in the internal loop filter. The recommended setting for VCO_R4_LF[2:0]
= 0 for optimum phase noise and jitter.
VCO_R4_LF[2:0]
0
1
2
3
4
5 to 7
R4 Value (kΩ)
Low (~200 Ω) (default)
10
20
30
40
Invalid
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