Analog Frequency Multiplier

VCXO Family of Products

47745 Fremont Blvd., Fremont, CA 94538 TEL (510) 492-0990, FAX (510) 492-0991

www.phaselink.com

Rev.:03-22-05 Page 5

VOLTAGE CONTROL SPECIFICATION

PARAMETERS

SYMBOL

CONDITIONS

MIN.

TYP.

MAX.

UNITS

VCXO Stabilization Time

From power valid

10

ms

VCXO Tuning Range

200

ppm

CLK output pullability

VCON= 1.65V

± 1.65V

±100

±120

ppm

Linearity

5

10

%

VCON input impedance

130

k

Ω

VCON modulation BW

0V < VCON < 3.3V, -3dB

25

kHz

EXTERNAL COMPONENT VALUES

INDUCTOR VALUE OPTIMIZATION

The required inductor value(s) for the best performance depends on the operating frequency, and the board

layout specifications. The listed values in this datasheet are based on the calculated parasitic values from

PhaseLink’s evaluation board design (Gerber file available upon request). These inductor values provide the user

with a starting point to determine the optimum inductor values. Additional fine-tuning may be required to

determine the optimal solution.

To assist with the inductor value optimization, PhaseLink has developed the “AFM Tuning Assistant” software.

You can download this software from PhaseLink’s web site (www.phaselink.com). The software consists of two

worksheets. The first worksheet (named L2) is used to fine-tune the ‘L2’ inductor value, and the second

worksheet (named L4) is used for fine tuning of the ‘L4’ (used in 4x AFMs only) inductor value.

For those designs using PhaseLink’s recommended board layout, you can use the “AFM Tuning Assistant” to

determine the optimum values for the required inductors. This software is developed based on the parasitic

information from PhaseLink’s board layout and can be used to determine the required inductor and parallel

capacitor (see LWB1 and Cstray parameters) values. For those employing a different board layout in their

design, we recommend to use the parasitic information of their board layout to calculate the optimized inductor

values. Please use the following fine tuning procedure: