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LM1205 データシート(PDF) 11 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
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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)

LM1205 データシート(HTML) 11 Page - National Semiconductor (TI)

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Functional Description (Continued)
TLH11881 – 14
FIGURE 6 Block Diagram of LM1205LM1207 Video Amplifier
TLH11881 – 15
FIGURE 7 Timing Diagram
Circuit Description
VIDEO AMPLIFIER INPUT STAGE
Figure 8 is a simplified schematic of one of the three video
amplifiers input stage along with the recommended external
components The IC pin numbers are circled and all external
components are shown outside the dashed line The video
input is applied to pin 6 via a 10 mF coupling capacitor and a
30X resistor The resistor is added to limit the current
through the input pin should an applied voltage surge rise
above VCC or drop below ground The performance of the
LM1205LM1207 is not degraded by the 30X resistor How-
ever if EMI is a concern this resistor can be increased to
well over 100X where the rise and fall times will start to
become longer DC bias to the input pin is provided by Q5
and its associated input circuitry Z1 is a 56V zener that
generates the input bias voltage Q1 is a buffer to the zener
reference voltage with 50V generated at its emitter Q3 and
Q4 are connected as diodes Q2 is close to being a diode in
this circuit This configuration will give about 20V at the
collector of Q2 R2 and R3 are a voltage divider setting the
base of Q5 to about 35V This sets the emitter of Q5 to
about 28V the bias voltage of the video input This bias
voltage is necessary to assure that the entire video signal
stays within the active operating region of the LM1205
LM1207 The bias voltage goes through R6 a 20k resistor
to the video input at pin 6 R4 and R6 are of the same value
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