LM6310IM NSC [National Semiconductor], LM6310IM Datasheet - Page 13

• Manufacturer Part Number: LM6310IM
• Description: High Speed Low Power Operational Amplifier with TRI-STATE Output
• Manufacturer: NSC [National Semiconductor]

Figure 2 shows a video multiplexer made from two LM6310
Figure 3 shows a four input video multiplexer With careful
Application Information
VIDEO GAIN OF
The design of the LM6310 has been optimized for gain of
formance of the LM6310 can be improved by adding a 1 k
pull down to
Typical values for differential gain and phase are 0 5% dif-
ferential gain and 0 1 degree differential phase
VIDEO MULTIPLEXING
and a logic device which can supply TTL equivalent level to
the DISABLE pins of the LM6310s Only one DISABLE line
should be high at any one time
Note that since a floating value on the DISABLE input is the
same as a high input if all of the logic device’s output go to
a TRI-STATE or high impedance mode all the LM6310’s
will turn on This should be avoided
Use adequate decoupling on the logic device to reduce
noise feedthrough of digital system and power noise to the
video signals If it is not possible to adequately decouple the
logic device consider using a small digital buffer such as a
hex schmidt trigger inverter which can be decoupled with
multiple capacitors and or ferrite beads to reduce digital
noise
layout differential gain and phase performance almost as
good as a single LM6310 can be achieved
A single 1 k
gain of about 0 05% and differential phase of about 0 3 de-
gree are possible with the 4 1 multiplexer
a
2 video applications The differential gain and phase per-
b
pull down to
5V to the output See Figure 1
a
FIGURE 1 Improving Video Differential Gain and Phase with 1 k
2
b
5V should be used Differential
(Continued)
A
V
e a
13
OTHER AMPLIFIERS WITH OUTPUT
DISABLE FUNCTIONS
The LMC6681 LMC6682 and LMC6684 are 1 MHz amplifi-
ers with TRI-STATE outputs which can be used for audio
and low frequency multiplexing like the LM6310 is used for
video multiplexing
OTHER HIGH SPEED AND VIDEO AMPLIFIERS
National Semiconductor has an extensive line of high speed
amplifiers with a range of operating voltage from 3V single
supply to
space saving SOT23-5 TinyPaK
1 43 mm about the size of a grain of rice) and the wide
S0-8 for better power dissipation
This op amp line includes
LM6171
LM7131
LM7171
Information on these parts is available from your National
Semiconductor representative
SPICE MACROMODEL
A SPICE macromodel of the LM6310 and many other Na-
tional Semiconductor op amps is available at no charge
from your National Semiconductor representative
2
g
100 MHz Low Distortion Amplifier with
3000 V
draws only 2 5 mA Specified at
supplies
TinyPaK (SOT23-5) Video amplifier with 70 MHz
gain bandwidth Specified at 3V 5V and
supplies
200 MHz Voltage Feedback amplifier with
100 mA output current and 4000 V
Supply current of 6 5 mA Specified at
g
15 and a range of package types such as the
5V
s slew rate Voltage Feedback design
pull down to
TL H 12545– 29
TM
b
(3 05 mm x 3 00 mm x
5V
http
g
15V and
www national com
s slew rate
g
15V and
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g
5V
5V
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