Zakładka z wyszukiwarką danych komponentów
  Polish  ▼
ALLDATASHEET.PL

X  

SL1714C Arkusz danych(PDF) 11 Page - Mitel Networks Corporation

Numer części SL1714C
Szczegółowy opis  Quadrature Downconverter
Download  20 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Producent  MITEL [Mitel Networks Corporation]
Strona internetowa  http://www.mitel.com
Logo MITEL - Mitel Networks Corporation

SL1714C Arkusz danych(HTML) 11 Page - Mitel Networks Corporation

Back Button SL1714C Datasheet HTML 7Page - Mitel Networks Corporation SL1714C Datasheet HTML 8Page - Mitel Networks Corporation SL1714C Datasheet HTML 9Page - Mitel Networks Corporation SL1714C Datasheet HTML 10Page - Mitel Networks Corporation SL1714C Datasheet HTML 11Page - Mitel Networks Corporation SL1714C Datasheet HTML 12Page - Mitel Networks Corporation SL1714C Datasheet HTML 13Page - Mitel Networks Corporation SL1714C Datasheet HTML 14Page - Mitel Networks Corporation SL1714C Datasheet HTML 15Page - Mitel Networks Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 20 page
background image
11
SL1714
APPLICATION NOTES
These application notes should be read in conjunction with
circuit diagrams contained in Fig. 7 and 10, and a
recommended front end tuner solution contained in Fig. 12.
These boards have been designed to demonstrate
performance and to allow for initial evaluation of the SL1714.
Varator Tuned Oscillator
Refer to Fig. 7 circuit diagram and Figs. 8 and 9PCB layout.
This application uses a synthesised VCO with a tuning
range of 460 MHz to 500 MHz. The surface mount inductor L1
is 12 nH. The VCO frequency is controlled by the SP5611
synthesiser which is programmed via an I2C bus. The RF input
to the synthesiser is from the SL1714 prescaler outputs
coupled via RF inductors L3 and L4.
For functional checking the VCO can be tuned by
physically shorting the base of transistor T3 to ground and
then adjusting the +30 volt supply to tune the VCO. Under
these conditions, due to the unlocked state of the LO, the
board WILL NOT BE representative of locked gain and phase
match or phase noise performance.
In real applications the VCO control voltage will be
provided by the QPSK demodulator circuit, such as the
VP305. This circuit provides a line voltage to align the
reference LO in the SL1714 in both frequency and phase to the
centre of the modulation bandwidth, normally 402.75 or 479.5
MHz.
As in all feedback loops the bandwidth of the varactor line
must be optimised for the symbol rate of the received
modulation.
It is recommended for optimum performance that the VCO
application is implemented symmetrically, in presented drive
and impedance to the VCO ports, as demonstrated in the
evaluation schematic and PCB.
In the recommended application the varactor diodes are
referenced to the VCO port DC bias voltages. This limits the
minimum tuning voltage on the varactor line to 3V. If lower
tuning voltage is required the tank can be AC coupled to the
VCO ports by 390pF capacitor and a DC reference voltage for
the varactor diodes applied by centre tapping the tank
inductors. NB the varactor diodes require a minimum of 1V
reverse bias for correct operation.
In real applications the maximum tuning range required for
the VCO will be determined by the required lock range of the
tuner and the manufacturing tolerance of the tank, assuming
the quadrature downconverter section will be alignment free.
This tuning range will typically be much smaller than the
demonstration board, which will consequently improve the
VCO phase noise performance.
This application can be ported direct to real system
implementations. Normal good RF practice must be applied to
the layout implementation.
Prescaler Outputs (varactor tuned VCO)
The VCO frequency divided by 32 is available at the
differential prescaler outputs, pins 10 and 11.
These enable the VCO frequency to be synthesised by a PLL
frequency synthesiser; on the demo board an SP5611 is used
for this function however in a real application this function will
be provided by the QPSK demodulator function contained in
for example the VP305.
It is recommended that the prescaler outputs are loaded
symmetrically to balance radiation effects.
Saw Resonator Oscillator
Refer to Fig. 10 circuit diagram and Figs 11 and 12 PCB
layout.
In the standard application the oscillator uses a varactor
diode tuned tank circuit which allows
fine tuning of the
oscillator frequency via a voltage control line. This control
voltage is usually derived from the QPSK/FEC decoder
VP305/VP306.
Certain applications do not require this fine tune facility so
a fixed frequency application using a SAW resonator has been
developed. In this application the frequency of the oscillator is
determined by the SAW resonator. The SAW is AC coupled
into the VCO pins of the device pins 13 and 14 via 100pF
coupling capacitors.
The SAW resonator used in this application is a ;
Murata Part No SAR479.45MB10X200
Prescaler Outputs (SAWR tuned VCO)
The VCO frequency divided by 32 is available at the
differential prescaler outputs, pins 10 and 11. Normally these
outputs will not be required since the derotation and fine tuning
required will be processed by the QPSK demodulator.
However these frequencies could be used if required for other
system reference frequencies or clocks.
If used it is recommended that the prescaler outputs are
loaded symmetrically to balance radiation effects.
VCO Disable
The on-chip oscillator can be disabled by connecting
VCODIS, pin 15, to ground and enabled by connecting to Vcc
via a 4K7 pull up resistor.
AGC
The AGC facility can be used to control the conversion gain
of the SL1714.
On the demonstration boards the conversion gain is
adjusted by means of a potentiometer, which is set to 2.5V so
giving a conversion gain of 40 dB. The voltage adjustment
range for the AGC is approximately 0.5 to 4.5 V.
It is important that the AGC voltage minimum does not give
a conversion gain of greater than 44dBs otherwise the
channel amplitude match may be degraded. In real
applications the AGC can be either set at a fixed control
voltage or controlled by means of the AGC control signal from
the QPSK demodulator dependant on the overall dynamic
range requirement of the tuner and it’s gain distribution.


Podobny numer części - SL1714C

ProducentNumer częściArkusz danychSzczegółowy opis
logo
Mitel Networks Corporat...
SL1710 MITEL-SL1710 Datasheet
508Kb / 12P
   Quadrature Downconverter
SL1711 MITEL-SL1711 Datasheet
566Kb / 20P
   Quadrature Downconverter
SL1711B MITEL-SL1711B Datasheet
566Kb / 20P
   Quadrature Downconverter
logo
Laird Tech Smart Techno...
SL17182P LSTD-SL17182P Datasheet
908Kb / 1P
   Neutral color and low silhouette
More results

Podobny opis - SL1714C

ProducentNumer częściArkusz danychSzczegółowy opis
logo
Mitel Networks Corporat...
SL1710 MITEL-SL1710 Datasheet
508Kb / 12P
   Quadrature Downconverter
SL1711 MITEL-SL1711 Datasheet
566Kb / 20P
   Quadrature Downconverter
logo
Intersil Corporation
HSP50214BVC INTERSIL-HSP50214BVC Datasheet
2Mb / 62P
   Programmable Downconverter
May 1, 2007
HSP50214B INTERSIL-HSP50214B_07 Datasheet
1Mb / 62P
   Programmable Downconverter
logo
Renesas Technology Corp
HSP50214B RENESAS-HSP50214B Datasheet
2Mb / 62P
   Programmable Downconverter
logo
Intersil Corporation
HSP50214A INTERSIL-HSP50214A Datasheet
467Kb / 60P
   Programmable Downconverter
HSP50214B INTERSIL-HSP50214B Datasheet
573Kb / 60P
   Programmable Downconverter
logo
Texas Instruments
TRF1015 TI-TRF1015 Datasheet
292Kb / 21P
[Old version datasheet]   RF DOWNCONVERTER
logo
Intersil Corporation
HSP50214 INTERSIL-HSP50214 Datasheet
395Kb / 54P
   Programmable Downconverter
logo
NXP Semiconductors
MRFIC1505A NXP-MRFIC1505A Datasheet
272Kb / 8P
   MRFIC1505A Integrated GPS Downconverter 1.575 GHz GPS DOWNCONVERTER
Rev. 1, 01/2005
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20


Arkusz danych Pobierz

Go To PDF Page


Link URL




Polityka prywatności
ALLDATASHEET.PL
Czy Alldatasheet okazała się pomocna?  [ DONATE ] 

O Alldatasheet   |   Reklama   |   Kontakt   |   Polityka prywatności   |   Linki   |   Lista producentów
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