LMX25121065EVAL/NOPB National Semiconductor, LMX25121065EVAL/NOPB Datasheet - Page 12

• Manufacturer Part Number: LMX25121065EVAL/NOPB
• Description: EVALUATION BOARD FOR LMX25121065
• Manufacturer: National Semiconductor
• Series: PLLatinum™r

Specifications of LMX25121065EVAL/NOPB

• Main Purpose: Timing, Frequency Synthesizer
• Embedded: No
• Utilized Ic / Part: LMX2512
• Primary Attributes: Single Fractional-N and Integer-N PLL with VCO
• Secondary Attributes: 1.065GHz, CodeLoader Graphical User Interface
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *LMX25121065EVAL; *LMX25121065EVAL/NOPB; LMX25121065EVAL

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Programming Description
RF N Counter Setting:
Pulse Swallow Function:
f
where
f
Prescaler Values:
RF_B: Preset divide ratio of binary 4-bit programmable counter (2 ≤ RF_B ≤ 15)
RF_A: Preset divide ratio of binary 3-bit swallow counter (0 ≤ RF_A ≤ 7 for LMX2502, 0 ≤ RF_A ≤ 5 for LMX2512)
RF_FN: Preset numerator of binary 11-bit modulus counter (0 ≤ RF_FN
= 19.68 MHz).
f
NOTE: For the use of reference frequencies other than those specified, please contact National Semiconductor.
VCO
VCO
OSC
: Output frequency of voltage controlled oscillator (VCO)
: Reference oscillator frequency
= {Prescaler x RF_B + RF_A + (RF_FN / f
Counter Name
Modulus Counter
Programmable
Counter
Swallow Counter
Device Type
LMX2502
LMX2512
Symbol
RF_FN
RF_B
RF_A
(Continued)
OSC
) x 10
4
} x f
OSC
12
Function
RF N Divider
N = Prescaler x RF_B + RF_A + (RF_FN / f
where (RF_A
<
1920 for f
<
OSC
RF_B)
= 19.20 MHz; 0 ≤ RF_FN
RF Prescaler
8
6
OSC
<
) x 10
1968 for f
4
OSC