LMX2486 datasheet(39/48 Pages) TI2

Part #	LMX2486

Description	LMX2486 1-GHz to 4.5-GHz High-Performance Delta-Sigma Low-Power Dual PLLatinum™ Frequency Synthesizers With 3-GHz Integer PLL

PDF	48 Pages

Scroll/Zoom	100%

Manufacturer	TI2 [Texas Instruments]

Direct Link	https://www.ti.com

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39 / 48 page

LMX2486

www.ti.com

SNAS324B – JANUARY 2006 – REVISED JANUARY 2016

Typical Application (continued)

9.2.1 Design Requirements

Table 50 lists the design parameters of the LMX2486.

Table 50. Design Parameters

PARAMETER

VALUE

Phase Margin

46.5 degrees

Loop Bandwidth

9.8 KHz

T3/T1

4.50%

Pole Ratio

T4/T3

57.70%

KPD

Charge Pump Gain

8X (760 µA)

fPD

Phase Detector Frequency

20 MHz

fVCO

VCO Frequency

3200 – 3250

Vcc

Supply

3 V

KVCO

VCO Gain

90 MHz/V

CVCO

VCO Input Capacitance

22 pF

C1_LF

6.8 nF

C2_LF

220 nF

C3_LF

4.7 nF

C4_LF

Loop Filter Components

15 nF

R2_LF

150

R3_LF

R4_LF

9.2.2 Detailed Design Procedure

The design of the loop filter involves balancing requirements of lock time, spurs, and phase noise. This design is

fairly involved, but the TI website has references, design tools, and simulation tools cover the loop filter design

and simulation in depth.

9.2.3 Application Curves

Figure 26. Fractional Spurs at 200-kHz Offset

Figure 25. Phase Noise

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