LM1202M National Semiconductor, LM1202M Datasheet - Page 6

• Manufacturer Part Number: LM1202M
• Description: IC VIDEO AMP SYST 230MHZ 20SOIC
• Manufacturer: National Semiconductor

Specifications of LM1202M

• Applications: General Purpose
• Number Of Circuits: 1
• -3db Bandwidth: 230MHz
• Current - Supply: 48mA
• Current - Output / Channel: 28mA
• Voltage - Supply, Single/dual (±): 8 V ~ 13.2 V
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (0.300", 7.50mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *LM1202M

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Circuit Description
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 (I
tors R10 and R11 thereby providing signal attenuation
Maximum attenuation is achieved when all of I
through Q9 and no current flows through the load resistors
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C8
) is diverted away from the load resis-
FIGURE 3 Simplified Schematic of the LM1202 Video Amplifier Input Stage
(Continued)
C8
flows
6
The differential pair Q11 and Q12 provide drive control
Q12’s base is internally biased at 7 3V 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
I
b
6 dB attenuation range
C8
(R10 R9)
flows through R10 thus providing a gain of A
c
V
IN
e b
1 Drive control thus provides a
TL H 11440 – 4
V1
e