データシートサーチシステム
  Japanese  ▼
ALLDATASHEET.JP

X  

LM1205 データシート(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM1205
部品情報  130 MHz/85 MHz RGB Video Amplifier System with Blanking
Download  24 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1205 データシート(HTML) 10 Page - National Semiconductor (TI)

Back Button LM1205 Datasheet HTML 6Page - National Semiconductor (TI) LM1205 Datasheet HTML 7Page - National Semiconductor (TI) LM1205 Datasheet HTML 8Page - National Semiconductor (TI) LM1205 Datasheet HTML 9Page - National Semiconductor (TI) LM1205 Datasheet HTML 10Page - National Semiconductor (TI) LM1205 Datasheet HTML 11Page - National Semiconductor (TI) LM1205 Datasheet HTML 12Page - National Semiconductor (TI) LM1205 Datasheet HTML 13Page - National Semiconductor (TI) LM1205 Datasheet HTML 14Page - National Semiconductor (TI) Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 24 page
background image
Functional Description (Continued)
The 0V to 4V drive control signal comes in on pin 18 Each
channel has its own drive section therefore the crosstalk
compensation needed for the contrast control voltages is
not required for the drive control thus no external pins for
the drive control The drive attenuator gives an attenuation
range from 0 dB to b6 dB A small gain adjustment range
for the drive attenuator is desirable and intentionally de-
signed because the drive is used only to balance the overall
gain of each color channel giving the correct color tempera-
ture on the CRT
The output of the drive attenuator stage goes to A2 the
amplifier in the DC restoration section The video signal
goes to the non-inverting input of A2 The inverting side of
A2 goes to the output of gm1 the clamp comparator and
the clamp capacitor at pin 8
During the back porch period of the video signal a negative
going clamp pulse from pin 14 is applied to the clamp com-
parator turning on the comparator This period is where the
black level of the video signal at the output of the LM1205
LM1207 is compared to the desired black level which is set
at pin 19
Figure 7 shows the timing of the clamp pulse
relative to the video signal The clamp capacitor is charged
or discharged by gm1 generating the correction voltage
needed at the inverting input of A2 to set the video output to
the correct DC level Removing the clamp pulse turns off
gm1 with the correction voltage being maintained by the
clamp capacitor during active video Both the clamp pulse
and the blank pulse at pin 13 are TTL voltage levels
There are actually two output sections bA3 and bA4 Both
sections have been designed to be identical except bA4
has more current drive capability The output transistor
shown is part of bA4 but has been shown separately so
the user knows the configuration of the output stage bA3
does not go to the outside world it is used for feeding back
the video signal for DC restoration Its output goes directly
to the inverting input of the clamp comparator via the volt-
age divider formed by the 500X and 4k resistors bA4 will
be close to the same output as bA3 and will temperature
track due to the similar design of the two output stages
However the current at the output of bA4 will be ten times
the current at the output of bA3 To balance both outputs a
load resistance of 390X needs to be connected from pin 20
the green video output pin to ground Another input to bA4
is the blank pulse When a negative going blank pulse is
applied to pin 13 the output of the LM1205LM1207 is driv-
en to less than 01V above ground Using the timing shown
in
Figure 7 for the blank pulse the output of the LM1205
LM1207 will be less than 01V during the inactive portion of
the video signal This is a ‘‘blacker than black’’ condition
blanking the CRT at the cathodes By using the blank func-
tion of the LM1205LM1207 no grid blanking is necessary
Note that the DC restoration is done by feeding back the
video signal from bA3 but blanking is done at bA4 By
using the two output stages blanking can be done at the
CRT cathodes and at the same time activate the DC resto-
ration loop
VCC1 goes to pins 3 11 and 25 (see Figure 1 ) These three
pins are all internally connected For proper operation of the
LM1205LM1207 it is necessary to connect all the VCC1
pins to the input power to the PCB and bypass each pin with
a 01 mF capacitor VCC2 is the input power at pins 22 and
23 for the three output stages This is a separate power
input from VCC1 there are no internal connections between
the two different power inputs There must be a connection
on the PCB between VCC1 and VCC2 Pins 22 and 23 must
be bypassed by a parallel connection of a 10 mF and 01 mF
capacitors
The ground connections for the LM1205
LM1207 are at pins 7 21 and 24 All three ground pins are
internally connected and these pins must also be connect-
ed externally to a good ground plane for proper operation of
the LM1205LM1207
http
www nationalcom
10


同様の部品番号 - LM1205

メーカー部品番号データシート部品情報
logo
Shanghai Leiditech Elec...
LM1205 LEIDITECH-LM1205 Datasheet
1Mb / 9P
   LCE P-Channel Enhancement Mode Power MOSFET
logo
LightKey Optoelectronic...
LM12057AB LIGHTKEY-LM12057AB Datasheet
117Kb / 3P
   LM12057A/B Series ??1.20 inch 5x7 Dot Matrix LED Display
LM12057AD LIGHTKEY-LM12057AD Datasheet
117Kb / 3P
   LM12057A/B Series ??1.20 inch 5x7 Dot Matrix LED Display
LM12057AG LIGHTKEY-LM12057AG Datasheet
117Kb / 3P
   LM12057A/B Series ??1.20 inch 5x7 Dot Matrix LED Display
LM12057AO LIGHTKEY-LM12057AO Datasheet
117Kb / 3P
   LM12057A/B Series ??1.20 inch 5x7 Dot Matrix LED Display
More results

同様の説明 - LM1205

メーカー部品番号データシート部品情報
logo
National Semiconductor ...
LM1208 NSC-LM1208 Datasheet
917Kb / 23P
   130 MHz/85 MHz RGB Video Amplifier System with Blanking
logo
Texas Instruments
LM1205A TI1-LM1205A Datasheet
1Mb / 26P
[Old version datasheet]   130 MHz/85 MHz RGB Video Amplifier System with Blanking
logo
National Semiconductor ...
LM1209 NSC-LM1209 Datasheet
391Kb / 24P
   130 MHz/100 MHz RGB Video Amplifier System with Blanking
January 1996
LM1212 NSC-LM1212 Datasheet
299Kb / 18P
   230 MHz Video Amplifier System with OSD Blanking
LM1281 NSC-LM1281 Datasheet
391Kb / 14P
   85 MHz RGB Video Amplifier System with On Screen Display (OSD)
LM1204 NSC-LM1204 Datasheet
399Kb / 20P
   150 MHz RGB Video Amplifier System
LM1203A NSC-LM1203A Datasheet
305Kb / 18P
   150 MHz RGB Video Amplifier System
LM1203B NSC-LM1203B Datasheet
291Kb / 16P
   100 MHz RGB Video Amplifier System
logo
Texas Instruments
LM1279 TI1-LM1279 Datasheet
798Kb / 20P
[Old version datasheet]   110 MHz RGB Video Amplifier System with OSD
logo
National Semiconductor ...
LM1279 NSC-LM1279 Datasheet
533Kb / 14P
   110 MHz RGB Video Amplifier System with OSD
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24


データシート ダウンロード

Go To PDF Page


リンク URL




プライバシーポリシー
ALLDATASHEET.JP
ALLDATASHEETはお客様のビジネスに役立ちますか?  [ DONATE ] 

Alldatasheetは   |   広告   |   お問い合わせ   |   プライバシーポリシー   |   リンク交換   |   メーカーリスト
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