PL560-37 Datasheet, PDF (5/15 Pages) Micrel Semiconductor – Analog Frequency Multiplier

Analog Frequency Multiplier
PL56X-XX VCXO Family
VOLTAGE CONTROL SPECIFICATION
PARAMETERS
SYMBOL
CONDITIONS
VCXO Stabilization Time
VCXO Tuning Range
CLK Output Pullability
Linearity
VCON Input Impedance
VCON Modulation BW
T_VCXOSTB
From power valid
XTAL C₀ /C₁ <300
VCON= 1.65V,  1.65V
XTAL C₀ /C₁ <300
0V < VCON < 3.3V, -3dB
MIN.
200
100
130
16
TYP.
120
5
MAX.
10
10
UNITS
ms
ppm
ppm
%
kΩ
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 v alues from
Micrel’s evaluation board design. 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.
The inductor is recommended to be a high Q small size 0402 or 0603 SMD component, and must be placed
between L2X / L4X and adjacent VDDOSC pin. Place inductor as close to the IC as possible to minimize parasitic
effects and to maintain inductor Q.
To assist with the inductor value optimization, Micrel has developed the “AFM Tuning Assistant” software. You
can download this software from Micrel’s web site (www.micrel.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 Micrel’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 Micrel’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:
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax [phone] • www.micrel.com Rev 11/04/11 Page 5