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LM1202M データシート(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM1202M
部品情報  LM1202 230 MHz Video Amplifier System
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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)

LM1202M データシート(HTML) 6 Page - National Semiconductor (TI)

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Circuit Description (Continued)
pin 8 produces a control voltage at pin 3 which drives the
base of Q9 By varying the voltage at the base of Q9 Q8’s
collector current (IC8) is diverted away from the load resis-
tors R10 and R11 thereby providing signal attenuation
Maximum attenuation is achieved when all of IC8 flows
through Q9 and no current flows through the load resistors
The differential pair Q11 and Q12 provide drive control
Q12’s base is internally biased at 73V Adjusting the volt-
age at the drive control input (pin 9) produces a control
voltage at the base of Q11 With Q9 off and Q12 off all of
IC8 flows through R10 thus providing a gain of AV1 e
b
(R10R9) c VIN eb1 Drive control thus provides a
6 dB attenuation range
TLH11440 – 4
FIGURE 3 Simplified Schematic of the LM1202 Video Amplifier Input Stage
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