LMX2485E EVAL National Semiconductor, LMX2485E EVAL Datasheet - Page 7

• Manufacturer Part Number: LMX2485E EVAL
• Description: BOARD EVALUATION LMX2485E
• Manufacturer: National Semiconductor
• Series: PLLatinum™r

Specifications of LMX2485E EVAL

• Main Purpose: Timing, Frequency Synthesizer
• Utilized Ic / Part: LMX2485E
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -

RF PLL Phase Noise with different Dithering Settings
L M X 2 4 8 5 E
E V A L U A T I O N
7
DITH=0 (Disabled)
(DITH=0 is the recommended setting)
Phase Noise measured at 49.2 MHz
CP gain set to 0.76 mA (8X)
Fraction Compensation set to 1/5
FM=2 (2
In these three plots, you will note that PN does not
degrade very little with weak dithering, but does
with strong dithering.
DITH=1 (Weak Dithering)
Phase Noise measured at 49.2 MHz
CP gain set to 0.76 mA (8X)
Fraction Compensation set to 1/5
FM=2 (2
DITH=2 (Strong Dithering)
Phase Noise measured at 49.2 MHz
CP gain set to 0.76 mA (8X)
Fraction Compensation set to 1/5
FM=2 (2
B O A R D
nd
nd
nd
order delta sigma modulator).
order delta sigma modulator).
order delta sigma modulator).
O P E R A T I N G
I N S T R U C T I O N S