LM1203BN National Semiconductor, LM1203BN Datasheet - Page 13

• Manufacturer Part Number: LM1203BN
• Description: IC VIDEO AMP RGB 100MHZ 28DIP
• Manufacturer: National Semiconductor

Specifications of LM1203BN

• Applications: General Purpose
• Number Of Circuits: 3
• -3db Bandwidth: 70MHz
• Current - Supply: 73mA
• Current - Output / Channel: 28mA
• Voltage - Supply, Single/dual (±): 10.8 V ~ 13.2 V
• Mounting Type: Through Hole
• Package / Case: 28-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *LM1203BN

Figure 11 shows a complete RGB video preamplifier circuit
Additional Applications of the LM1203B
using
(MM74HC86) is used to generate the back porch clamp sig-
nal from the composite sync input signal The composite
H Sync input signal may have either polarity The back
porch clamp signal applied to LM1203B’s pin 14 allows
clamping the video output signals to the black reference
level thereby providing DC restoration The back porch
clamp pulse width is determined by the time constant due to
the product of R11 and C15 For fast horizontal scan rates
the
LM1203B
A
quad
Exclusive-OR
FIGURE 11 LM1203B Applications Circuit
gate
13
(Continued)
the back porch clamp pulse width can be made narrower by
decreasing the value of R11 or C15 or both Note that an
MM74C86 Exclusive-Or gate may also be used however
the pin out is different than that of the MM74HC86
For optimum performance and maximum bandwidth high
speed buffer transistors (Q1 Q2 and Q3 in Figure 11 ) are
recommended The 2N5770 NPN transistors maintain high
speed at high currents when driving the inputs of high volt-
age CRT drivers
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