LMX2531LQE1226E/NOPB National Semiconductor, LMX2531LQE1226E/NOPB Datasheet - Page 30

• Manufacturer Part Number: LMX2531LQE1226E/NOPB
• Description: IC PLL FREQ SYNTH W/VCO 36-LLP
• Manufacturer: National Semiconductor
• Series: PowerWise®r
• Type: Clock/Frequency Synthesizer (RF)r

Specifications of LMX2531LQE1226E/NOPB

• Pll: Yes
• Input: Clock
• Output: CMOS
• Number Of Circuits: 1
• Ratio - Input:output: 2:2
• Differential - Input:output: No/No
• Frequency - Max: 1.268GHz
• Divider/multiplier: Yes/No
• Voltage - Supply: 2.8 V ~ 3.2 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 36-LLP
• Frequency-max: 1.268GHz
• For Use With: LMX25311226EVAL - BOARD EVAL FOR LMX25311226
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LMX2531LQE1226ETR

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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