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LM1270NA データシート(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM1270NA
部品情報  Hi-Brite 200 MHz I2C Compatible RGB Image Enhancer with Video Auto Sizing
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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)

LM1270NA データシート(HTML) 9 Page - National Semiconductor (TI)

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Functional Description (Continued)
Using the data encoded on the video eliminates one stage of
communicating with the LM1270, allowing for a faster re-
sponse time for changes in the Hi-Brite window.
V
REF
Proper operation of the LM1270 does require a very accu-
rate reference voltage. This voltage is generated in the V
REF
block. To insure an accurate voltage over temperature, an
external resistor is used to set the current in the V
REF stage.
The external resistor is connected to pin 23. This resistor
should be 1% and have a temperature coefficient under
100 ppm/˚C. ALL VIDEO SIGNALS MUST BE KEPT AWAY
FROM PIN 23. This pin has a very high input impedance and
will pick up any high frequency signals routed near it. The
board layout shown in Figure 12 is a good example of trace
routing near pin 23. The output of the V
REF stage goes to a
number of blocks in the video section and also to pin 22. This
pin allows capacitor filtering on the V
REF output and offers an
accurate external reference. A buffer must be used with this
reference, the maximum current loading should be only
100 µA. Pin 22 is bi-directional, allowing the LM1270 to be
referenced to a pre-amp V
REF. This configuration makes it
possible to DC couple to the pre-amp, but for accurate DC
level, it is recommended that AC coupling be used between
the LM1270 and the pre-amp. It is also recommended that
the internal V
REF be used for best performance. Note: Any
noise injected into pin 22 will appear on the video. The
voltage reference must be kept very clean for best perfor-
mance of the LM1270.
H FLYBACK
H Flyback is an analog signal input from the monitor hori-
zontal scan. This flyback signal goes to the internal horizon-
tal flyback pulse generation circuit. An optional capacitor
and/or resistor to ground may be needed if noise interferes
with the H Flyback signal or if there is ringing on the H
Flyback signal. Note: there is no blanking pedestal on the
output video. If horizontal blanking is to be added to the
video signal it must be done at the pre-amp.
R
LIMIT is used to limit the input current into the IC to a
maximum value of +1 mA during flyback and −100 µA during
normal forward scan. For example if an H flyback with a peak
of 100V is used, R
LIMIT = 100 k
Ω. The internal input imped-
ance of pin 16 is low to limit the maximum voltage swing at
the input to be within the supply rail and ground. Figure 2
shows the H flyback waveforms and the location of R
LIMIT.A
56 pF capacitor has been added to the H Flyback pin for
filtering noise on the H Flyback signal.
VERTICAL BLANKING
A similar vertical pulse generation circuit to the LM1238 is
included internal to the LM1270. The leading edge of the
vertical sync is used to start the programmable vertical
blanking signal directly. The Vertical Blank Duration Control
Register sets the width of the pulse. When vertical blanking
is enabled its polarity is programmable.
CLAMPING
Pin 24, the clamp pin, can be set for either an input or and
output. If used as an input, then this pin functions just like the
clamp input pins to the video pre-amps. One should use a
series 1 k
Ω resistor to pin 24 and a small capacitor may also
be needed between pin 24 and ground to filter high fre-
quency noise.
20063519
FIGURE 2. H Flyback Input Pulse
www.national.com
9


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