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LMX2531LQ1500E Datasheet(PDF) 21 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) 21 Page - National Semiconductor (TI)

 
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2.0 General Programming Information (Continued)
2.7.7 VCO_ACI_SEL
This bit is used to optimize the VCO phase noise. The recommended values are what are used for all testing purposes, and this
bit should be set as the table below instructs.
Part
VCO_ACI_SEL
LMX2531LQ1500E
8
2.7.8 XTLSEL[2:0] -- Crystal Select
XTLSEL
Crystal Frequency
0
<25 MHz
1
25-50MHz
2
50-70MHz
3
>70 MHz
4
Manual Mode
5
Reserved
6
Reserved
7
Reserved
The value of this word needs to be changed based on the frequency presented to the OSCin pin in accordance to the table above.
2.8 REGISTER R7
2.8.1 XTLDIV[1:0] -- Division Ratio for the Crystal Frequency
The frequency provided to the VCO frequency calibration circuitry is based on the OSCin frequency divided down by a factor,
determined by the XTLDIV word. Note that this division ratio is independent of the R counter value or the comparison frequency.
The necessary division ratio depends on the OSCin frequency and is shown in the table below:
XTLDIV
Crystal Division Ratio
Crystal Range
0
Reserved
Reserved
1
Divide by 2
< 20 MHz
2
Divide by 4
20-40 MHz
3
Divide by 8
> 40 MHz
2.8.2 XTLMAN[11:0] -- Manual Crystal Mode
Program all these bits to zero.
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