LMX25311146EVAL National Semiconductor, LMX25311146EVAL Datasheet - Page 30

• Manufacturer Part Number: LMX25311146EVAL
• Description: BOARD EVAL FOR LMX25311146
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LMX25311146EVAL

• Main Purpose: Timing, Frequency Synthesizer
• Utilized Ic / Part: LMX2531LQ1146E
• Silicon Manufacturer: National
• Silicon Core Number: LMX2531
• Kit Application Type: Clock & Timing
• Application Sub Type: Frequency Synthesizer
• Kit Contents: Board, Cable, CD
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Supplier Unconfirmed

www.national.com
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.
2.7.8 XTLSEL[2:0] -- Crystal Select
The XTLSEL bit is used to select between manual crystal mode and one of the automatic modes. The user may choose manual
crystal mode (XTLSEL=4) and program the XTLMAN (R7[21:10]) and XTLMAN2 (R7[4]) bits for a specific OSCin frequency, or
one of the automatic modes (XTLSEL = 0,1,2,3). For the LMX2531LQ2080E/2570E options or when the OSCin frequency is less
than 8 MHz, manual crystal mode must always be selected. The automatic modes can be used for the other frequency options.
When using one of the automatic modes, XTLSEL should be set based on the OSCin frequency.
XTLSEL
5,6,7
0
1
2
3
4
LMX2531LQ2265E
LMX2531LQ2570E
LMX2531LQ2820E
LMX2531LQ3010E
All Other Options
Must use this for LMX2531LQ2080E/2570E/2820E/3010E
Programming of XTLMAN2 (R7[4]) may be required.
Programming of XTLMAN (R7[21:10]) not required.
Part
Programming of XTLMAN2 (R7[4]) not required.
Programming of XTLMAN (R7[21:10]) required.
Must use this if f
Manual Crystal Mode
Automatic Modes
Mode
30
OSCin
< 8 MHz
VCO_ACI_SEL
Reserved
8
6
OSCin Frequency
25 - 50 MHz
50 - 70 MHz
70 - 80 MHz
8 - 25 MHz
5 - 80 MHz