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LM1044N データシート(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM1044N
部品情報  Analog Video Switch
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1044N データシート(HTML) 5 Page - National Semiconductor (TI)

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Pin Description
Note
The pin designations CV R G B and Sync are as-
signed for the convenience of description and are not in-
tended to be a limitation For example RGB could be YUV
or they could all be independent signal sources
Pin 1
Composite video input 1 (CV1) biased internally
via 18 kX to
VS
2
a
1V
Pin 2
Composite video input 2 (CV2) biased as for pin
1 (CV1) above
Pin 3
Composite video input 3 (CV3) biased as for pin
1 (CV1) above
Pin 4
RGB input R1 This pin is internally biased via
a clamp circuit to
VS
2
a
1V and should be AC
coupled to a low impedance source
The input coupling capacitor also acts as a
clamp capacitor see application notes
Pin 5
RGB input G1 biased as for pin 4 (R1) above
Pin 6
RGB input B1 biased as for pin 4 (R1) above
Pin 7
Sync input S1 biased internally via 25k to
VS
2
a
1V
Pin 8
RGB input R2 biased as for pin 4 (R1) above
Pin 9
RGB input G2 biased as for pin 4 (R1) above
Pin 10
RGB input B2 biased as for pin 4 (R1) above
Pin 11
Sync input S2 biased as for pin 7 (S1) above
Pin 12
Negative supply (GND)
Pin 13
Connect a capacitor to GND to decouple the
internal bias of the RGB amplifiers
Pin 14
Internal bias for the CV and Sync Amplifiers
decouple with a capacitor to GND
Pin 15
B Output
Pin 16
G Output
Pin 17
R Output
Pin 18
This is the clamp pulse input pin A positive
going pulse activates the RGB input bias
clamps
See application notes
Pin 19
Channel select input control C
Pin 20
Channel select input control B
Pin 21
Channel select input control A
Pin 22
Enable input for control latches Channel
selection is locked while this input is low and is
updated when high The minimum enable pulse
width is 5 ms
Pin 23
CV output or Sync output when an RGB channel
is selected
Pin 24
Supply pin (VS) This pin should be well
decoupled at high frequencies a 100 nF
capacitor connected close to the supply pins is
normally adequate
Application Notes
DEVICE DESCRIPTION
The LM1044 video switch circuit has a configuration as illus-
trated in
Figure 1 and consists of a 3 input to 1 output 5
MHz switch with 6 dB gain three 2 input to 1 output 30
MHz 0 dB gain switches coupled together with a 2 input to
1 output switch sharing the 3 way switch output All switch
stages are current switched differential amplifers with feed-
back providing low impedance buffered outputs Latched
logic inputs with control decoding are provided for switch
control and a DC clamp facility is available on the 30 MHz
channels
The principle application of this device is the selection be-
tween various composite video (CV) or Red Green and
Blue (RGB) sources now found in video systems using vari-
ous signal sources eg
VCR’s satellite receivers home
computers and video games Other possible application ex-
amples for example security camera switching are shown
towards the end of these notes
The 5 MHz channels are ideally suited for the switching of
composite video sources and have a gain of 6 dB to allow
amplification from terminated inputs back up to internal sig-
nal levels The 30 MHz channels are suitable for direct RGB
inputs to display high quality graphics and will also handle
high quality linear signals The fourth switch channel shares
the CV output pin and is ideal for routing synchronization
signals from the RGBYUV sources into the path to the
sync separator and timebase circuits
CHANNEL SELECTION
The switch selections are made via the enable and 3 logic
control inputs according to the truth table shown on the
following page This gives a choice of 3 CV video signal
sources or 2 RGB plus Sync signals on the video display
TLH9252 – 3
FIGURE 1
5


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