LMK03000 National Semiconductor Corporation, LMK03000 Datasheet - Page 16

• Manufacturer Part Number: LMK03000
• Manufacturer: National Semiconductor Corporation

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2.4 REGISTER R13
2.4.1 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.
2.4.2 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.
2.4.3 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_C3_C4_LF[3:0]
VCO_R3_LF[2:0]
VCO_R4_LF[2:0]
12 to 15
5 to 7
5 to 7
10
11
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
0
1
2
3
4
16
C3 (pF)
100
100
100
150
150
50
50
50
0
0
0
0
Loop Filter Capacitors
R3 Value (kΩ)
R4 Value (kΩ)
Low (< 100 Ω)
Low (< 100 Ω)
Invalid
Invalid
Invalid
10
20
30
40
10
20
30
40
C4 (pF)
110
110
110
160
160
110
10
60
10
10
60
60