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LMX2531LQ1500E Datasheet(PDF) 20 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LMX2531LQ1500E
Description  High Performance Frequency Synthesizer System with Integrated VCO
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LMX2531LQ1500E Datasheet(HTML) 20 Page - National Semiconductor (TI)

 
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2.0 General Programming Information (Continued)
2.7 REGISTER R6
2.7.1 C3_C4_ADJ[2:0] -- VALUE FOR C3 AND C4 IN THE INTERNAL LOOP FILTER
C3_C4_ADJ
C3 (pF)
C4 (pF)
050
50
1
50
100
2
50
150
3
100
50
4
150
50
5
100
100
6
50
150
7
50
150
2.7.2 R3_ADJ_FL[1:0] -- Value for Internal Loop Filter Resistor R3 During Fastlock
R3_ADJ_FL Value
R3 Resistor During Fastlock (k
Ω)
010
120
230
340
2.7.3 R3_ADJ[1:0] -- Value for Internal Loop Filter Resistor R3
R3_ADJ
R3 Value (k
Ω)
010
120
230
340
2.7.4 R4_ADJ_FL[1:0] -- Value for Internal Loop Filter Resistor R4 During Fastlock
R4_ADJ_FL
R4 Value during Fast Lock (k
Ω)
010
120
230
340
2.7.5 R4_ADJ[1:0] -- Value for Internal Loop Filter Resistor R4
R4_ADJ
R4 Value (k
Ω)
010
120
230
340
2.7.6 EN_LPFLTR-- Enable for Partially Integrated Internal Loop Filter
The Enable Loop Filter bit is used to enable/disable the 3rd and 4th pole on-chip loop filters.
EN_LPFLTR
3rd and 4th Poles of Loop Filter
0
disabled
(R3 = R4 = 0 ohms and C3 + C4 = 200pF)
1
enabled
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