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LM1212 データシート(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM1212
部品情報  230 MHz Video Amplifier System with OSD 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)

LM1212 データシート(HTML) 6 Page - National Semiconductor (TI)

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Circuit Description (Continued)
Transistor Q7 buffers the video signal VIN and Q8 converts
the voltage to current The AC collector current through Q8
is IC8 e VIN R9 Under maximum gain condition transistors
Q9 and Q11 are off and all of IC8 flows through the load
resistors R10 and R11 The maximum signal gain at the
base of Q13 is AV1 eb(R10 a R11)R9 eb2 Signal
attenuation is achieved by varying the base drive to the dif-
ferential pairs Q9 Q10 and Q11 Q12 thereby unbalancing
the collector currents through the transistor pairs Base of
Q10 is biased at 53V by its connection to the emitter of Q41
(see
Figure 5 ) Pin 2 is connected to pin 3 through a 10X
resistor Adjusting the contrast voltage at 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 resistors 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
TLH12354 – 9
FIGURE 3 Simplified Schematic of the LM1212 Video Amplifier Input Stage
http
www nationalcom
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