Datenblatt-Suchmaschine für elektronische Bauteile
  German  ▼
ALLDATASHEETDE.COM

X  

MC12149D Datenblatt(PDF) 4 Page - LANSDALE Semiconductor Inc.

Teilenummer MC12149D
Bauteilbeschribung  Low Power Voltage Controlled Oscillator Buffer
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Hersteller  LANSDALE [LANSDALE Semiconductor Inc.]
Direct Link  http://www.lansdale.com
Logo LANSDALE - LANSDALE Semiconductor Inc.

MC12149D Datenblatt(HTML) 4 Page - LANSDALE Semiconductor Inc.

  MC12149D Datasheet HTML 1Page - LANSDALE Semiconductor Inc. MC12149D Datasheet HTML 2Page - LANSDALE Semiconductor Inc. MC12149D Datasheet HTML 3Page - LANSDALE Semiconductor Inc. MC12149D Datasheet HTML 4Page - LANSDALE Semiconductor Inc. MC12149D Datasheet HTML 5Page - LANSDALE Semiconductor Inc. MC12149D Datasheet HTML 6Page - LANSDALE Semiconductor Inc. MC12149D Datasheet HTML 7Page - LANSDALE Semiconductor Inc. MC12149D Datasheet HTML 8Page - LANSDALE Semiconductor Inc. MC12149D Datasheet HTML 9Page - LANSDALE Semiconductor Inc. Next Button
Zoom Inzoom in Zoom Outzoom out
 4 / 12 page
background image
www.lansdale.com
Page 4 of 12
Figure 2. ML12149 Typical External Component Connections
8
7
6
5
1
2
3
4
VCO
1. This input can be left open, tied to ground, or tied with a resistor to ground, depending
on the desired output amplitude needed at the Q and QB output pair.
2. Typical values for R1 range from 5.0 k
Ω to 10 kΩ.
Q2
Q
GND
QB
VCC
CNTL
TANK
VREF
C2a
C3a
Note 1
Cb
LT
CV
R1
Vin
C2a
C3a
VCC Supply
C7
C6a
C6b
L2b
L2a
To Prescaler
VCO Output
VCO Output
C1
ML12149
LANSDALE Semiconductor, Inc.
A simplified linear approximation of the device, package, and
typical board parasitics has been developed to aid the designer in
selecting the proper tank circuit values. All the parasitic contribu-
tions have been lumped into a parasitic capacitive component and a
parasitic inductive component. While this is not entirely accurate, it
gives the designer a solid starting point for selecting the tank com-
ponents. Below are the parameters used in the model.
Cp Parasitic Capacitance
Lp Parasitic Inductance
LT Inductance of Coil
C1 Coupling Capacitor Value
Cb Capacitor for decoupling the Bias Pin
CV Varactor Diode Capacitance (Variable)
The values for these components are substituted into the follow-
ing equations:
From Figure 2, it can be seen that the varactor capacitance (CV) is
in series with the coupling capacitor (C1). This is calculated in
Equation 2. For analysis purposes, the parasitic capacitances (CP) are
treated as a lumped element and placed in parallel with the series
combination of C1 and CV. This compound capacitance (Ci) is in
series with the bias capacitor (Cb) which is calculated in Equation 3.
The influences of the various capacitances; C1, CP, and Cb, impact
the design by reducing the variable capacitance effects of the varac-
tor which controls the tank resonant frequency and tuning range.
Now the results calculated from Equation 2, Equation 3 and
Equation 4 can be substituted into Equation 1 to calculate the actu-
al frequency of the tank.
To aid in analysis, it is recommended that the designer use a sim-
ple spreadsheet based on Equation 1 through Equation 4 to calcu-
late the frequency of operation for various varactor/inductor selec-
tions before determining the initial starting condition for the tank.
The two main components at the heart of the tank are the induc-
tor (LT) and the varactor diode (CV). The capacitance of a varactor
diode junction changes with the amount of reverse bias voltage
applied across the two terminals. This is the element which actually
“tunes” the VCO. One characteristic of the varactor is the tuning
ratio which is the ratio of the capacitance at specified minimum
and maximum voltage points. For characterizing the ML12149, a
Matsushita (Panasonic) varactor – MA393 was selected. This
device has a typical capacitance of 11 pF at 1.0 V and 3.7 pF at 4.0
V and the C–V characteristic is fairly linear over that range.
Similar performance was also acheived with Loral varactors. A
multi–layer chip inductor was used to realize the LT component.
These inductors had typical Q values in the 35 to 50 range for fre-
quencies between 500 and 1000 MHz.
Note: There are many suppliers of high performance varactors
and inductors and Motorola can not recommend one vendor over
another.
The Q (quality factor) of the components in the tank circuit has a
direct impact on the resulting phase noise of the oscillator. In gen-
eral, the higher the Q, the lower the phase noise of the resulting
oscillator. In addition to the LT and CV components, only high
quality surface–mount RF chip capacitors should be used in the
tank circuit. These capacitors should have very low dielectric loss
(high–Q). At a minimum, the capacitors selected should be operat-
ing 100 MHz below their series resonance point. As the desired fre-
quency of operation increases, the values of the C1 and Cb capaci-
tors will decrease since the series resonance point is a function of
Legacy Applications Information
Equation 2
Ci =
x
+
x
+
C1
CV
C1
CV
Cp
Equation 3
C=
Ci
Cb
Ci
Cb
L =
Lp + LT
Equation 4
Issue B


Ähnliche Teilenummer - MC12149D

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Motorola, Inc
MC12149D MOTOROLA-MC12149D Datasheet
169Kb / 12P
   LOW POWER VOLTAGE CONTROLLED OSCILLATOR BUFFER
logo
Freescale Semiconductor...
MC12149D FREESCALE-MC12149D Datasheet
362Kb / 12P
   LOW POWER VOLTAGE CONTROLLED OSCILLATOR BUFFER
logo
LANSDALE Semiconductor ...
MC12149D LANSDALE-MC12149D Datasheet
344Kb / 12P
   Low Power Voltage Controlled Oscillator Buffer
More results

Ähnliche Beschreibung - MC12149D

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
LANSDALE Semiconductor ...
ML12149 LANSDALE-ML12149_08 Datasheet
344Kb / 12P
   Low Power Voltage Controlled Oscillator Buffer
logo
Motorola, Inc
MC12147 MOTOROLA-MC12147 Datasheet
391Kb / 12P
   Low Power Voltage Controlled Oscillator Buffer
MC12149 MOTOROLA-MC12149 Datasheet
169Kb / 12P
   LOW POWER VOLTAGE CONTROLLED OSCILLATOR BUFFER
logo
Freescale Semiconductor...
MC12149 FREESCALE-MC12149 Datasheet
362Kb / 12P
   LOW POWER VOLTAGE CONTROLLED OSCILLATOR BUFFER
logo
Motorola, Inc
MC12148 MOTOROLA-MC12148 Datasheet
82Kb / 5P
   LOW POWER VOLTAGE CONTROLLED OSCILLATOR
logo
Z-Communications, Inc
V950ME17-LF ZCOMM-V950ME17-LF Datasheet
85Kb / 2P
   Voltage-Controlled Oscillator Voltage-Controlled Oscillator
ZRO0743B2LF ZCOMM-ZRO0743B2LF Datasheet
85Kb / 2P
   Voltage-Controlled Oscillator Voltage-Controlled Oscillator
V800ME10 ZCOMM-V800ME10_10 Datasheet
82Kb / 2P
   Voltage-Controlled Oscillator Voltage-Controlled Oscillator
logo
SYNERGY MICROWAVE CORPO...
DCYS300600-5 SYNERGY-DCYS300600-5 Datasheet
357Kb / 3P
   VOLTAGE CONTROLLED OSCILLATOR VOLTAGE CONTROLLED OSCILLATOR
DCSO1000-12 SYNERGY-DCSO1000-12 Datasheet
358Kb / 3P
   VOLTAGE CONTROLLED OSCILLATOR
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12


Datenblatt Download

Go To PDF Page


Link URL




Privatsphäre und Datenschutz
ALLDATASHEETDE.COM
War ALLDATASHEET hilfreich?  [ DONATE ] 

Über Alldatasheet   |   Werbung   |   Kontakt   |   Privatsphäre und Datenschutz   |   Linktausch   |   Hersteller
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com