Moteur de recherche de fiches techniques de composants électroniques
  French  ▼
ALLDATASHEET.FR

X  

ML13175-5P Fiches technique(PDF) 9 Page - LANSDALE Semiconductor Inc.

No de pièce ML13175-5P
Description  UHF FM/AM Transmitter
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  LANSDALE [LANSDALE Semiconductor Inc.]
Site Internet  http://www.lansdale.com
Logo LANSDALE - LANSDALE Semiconductor Inc.

ML13175-5P Fiches technique(HTML) 9 Page - LANSDALE Semiconductor Inc.

Back Button ML13175-5P Datasheet HTML 5Page - LANSDALE Semiconductor Inc. ML13175-5P Datasheet HTML 6Page - LANSDALE Semiconductor Inc. ML13175-5P Datasheet HTML 7Page - LANSDALE Semiconductor Inc. ML13175-5P Datasheet HTML 8Page - LANSDALE Semiconductor Inc. ML13175-5P Datasheet HTML 9Page - LANSDALE Semiconductor Inc. ML13175-5P Datasheet HTML 10Page - LANSDALE Semiconductor Inc. ML13175-5P Datasheet HTML 11Page - LANSDALE Semiconductor Inc. ML13175-5P Datasheet HTML 12Page - LANSDALE Semiconductor Inc. ML13175-5P Datasheet HTML 13Page - LANSDALE Semiconductor Inc. Next Button
Zoom Inzoom in Zoom Outzoom out
 9 / 16 page
background image
LANSDALE Semiconductor, Inc.
ML13175/ML13176
Figure 16 Shows the improved hold–in range of the loop. The
∆fref
is moved 950 kHz with over 200
µA swing of control current for an
improved hold–in range of ±15.2 MHz or ±95.46 Mrad/sec.
LOCK–IN RANGE/CAPTURE RANGE
If a signal is applied to the loop not equal to free running frequency,
ff, then the loop will capture or lock–in the signal by making fs = fo
(i.e. if the initial frequency difference is not too great). The lock–in
range can be expressed as
∆ωL ~ ± 2L ωn
FM MODULATION
Noise external to the loop (phase detector input) is minimized by nar-
rowing the bandwidth. This noise if minimal in a PLL system since the
reference frequency is usually derived from a crystal oscillator. FM can
be achieved by applying a modulation current superimposed on the
control current of the CCO. The loop bandwidth must be narrow
enough to prevent the loop from responding to the modulation frequen-
cy components, thus, allowing the CCO to deviate in frequency. The
loop bandwidth is related to the natural frequency wn. In the lag–lead
design example where the natural frequency,
ωn = 5.0 krad/sec and a
damping factor, L = 0.707, the loop bandwidth = 1.64 kHz.
Characterization data of the closed loop responses for both the
ML13175 and ML13176 at 320 MHz (Figures 7 and 8, respectively)
show satisfactory performance using only a simple low–pass loop filter
network. The loop filter response is strongly influenced by the high
output impedance of the push–pull current output of the phase detector.
fc = 0.159/RC;
For R = 1.0 k + R7 (R7 = 53 k) and C = 390 pF
fc = 7.55 kHz or ωc = 47 krad/sec
The application example in Figure 17a of a 320 MHz FM transmitter
demonstrates the FM capabilities of the IC. A high value series resistor
(100 k) to Pin 6 sets up the current source to drive the modulation sec-
tion of the chip. Its value is dependent on the peak to peak level of the
encoding data and the maximum desired frequency deviation. The data
input is AC coupled with a large coupling capacitor which is selected
for the modulating frequency. The component placements on the circuit
side and ground side of the PC board are shown in Figures 28 and 29
respectively.
For voice application using a dynamic or an electret microphone, an op
amp is used to amplify the microphone’s low level output . The micro-
phone amplifier circuit is shown in Figure 19. Figure 17b shows an
application example for NBFM audio or direct FSK in which the refer-
ence crystal oscillator is modulated.
LOCAL OSCILLATOR APPLICATION
To reduce internal loop noise, a relatively wide loop bandwidth is
needed so that the loop tracks out or cancels the noise. This is empha-
sized to reduce inherent CCO and divider noise or noise produced by
mechanical shock and environmental vibrations. In a local oscillator
application the CCO and divider noise should be reduced by proper
selection of the natural frequency of the loop. Additional low pass fil-
tering of the output will likely be necessary to reduce the crystal side-
band spurs to a minimal level.
Legacy Applications Information
Figure 16. ML13176 Reference Oscillator
Frequency versus Oscillator Control Current
–150
I6, OSCILLATOR CONTROL CURRENT (µA)
–100
– 50
50
100
0
Closed Loop Response:
fo = 32 x fref
VCC = 3.0 Vdc
ICC = 38 mA
Pout = 4.8 dB
Imod = 2.0 mA
Vref = 500 mVp–p
10.6
10.4
10.2
9.6
9.4
10
9.8
120k
100k
VCC
MC33171
1.0
10k
Electret
Microphone
10k
3.9k
Data
Input
Data or
Audio
Output
Voice
Input
VCC
1.0k
3.3k
Figure 19. Microphone Amplifier
www.lansdale.com
Page 9 of 16
Issue c


Numéro de pièce similaire - ML13175-5P

FabricantNo de pièceFiches techniqueDescription
logo
LANSDALE Semiconductor ...
ML13175-5P LANSDALE-ML13175-5P Datasheet
304Kb / 16P
   UHF FM/AM Transmitter
More results

Description similaire - ML13175-5P

FabricantNo de pièceFiches techniqueDescription
logo
TEMIC Semiconductors
U2740B TEMIC-U2740B Datasheet
264Kb / 10P
   UHF AM/FM Transmitter
logo
Motorola, Inc
MC13176 MOTOROLA-MC13176 Datasheet
748Kb / 18P
   UHF FM/AM Transmitter
logo
LANSDALE Semiconductor ...
ML13175 LANSDALE-ML13175_08 Datasheet
304Kb / 16P
   UHF FM/AM Transmitter
logo
Motorola, Inc
MC13175 MOTOROLA-MC13175 Datasheet
269Kb / 17P
   UHF FM/AM TRANSMITTER
logo
CML Microcircuits
CMX017 CMLMICRO-CMX017 Datasheet
1Mb / 14P
   UHF FM/FSK Transmitter
logo
rfsolutions.ltd
120T1-433F RFSOLUTIONS-120T1-433F_14 Datasheet
1Mb / 5P
   AM / FM RADIO TRANSMITTER KEYFOBS
logo
List of Unclassifed Man...
CMX017 ETC-CMX017 Datasheet
372Kb / 12P
   UHF FM/FSK Transmitter
logo
rfsolutions.ltd
120T1-433F RFSOLUTIONS-120T1-433F Datasheet
81Kb / 3P
   AM / FM RADIO TRANSMITTER KEYFOBS
logo
Radiometrix Ltd
TX2H-433-64-5V RADIOMETRIX-TX2H-433-64-5V Datasheet
226Kb / 5P
   UHF High Power FM Transmitter
TX2H-4XX-64 RADIOMETRIX-TX2H-4XX-64 Datasheet
228Kb / 5P
   UHF High Power FM Transmitter
More results


Html Pages

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


Fiches technique Télécharger

Go To PDF Page


Lien URL




Politique de confidentialité
ALLDATASHEET.FR
ALLDATASHEET vous a-t-il été utile ?  [ DONATE ] 

À propos de Alldatasheet   |   Publicité   |   Contactez-nous   |   Politique de confidentialité   |   Echange de liens   |   Fabricants
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