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參數(shù)資料
| 型號： | LM7131BMDC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 CHANNEL, VIDEO AMPLIFIER, UUC |
| 封裝： | DIE |
| 文件頁數(shù)： | 2/26頁 |
| 文件大?。?/td> | 591K |
| 代理商： | LM7131BMDC |
Application Information (Continued)
The LM7131 is available in two package types: SO-8 surface
mount package and the SOT23-5 Tiny package for space
and weight savings.
The LM7131 has been designed to meet some of the most
demanding
requirements
for
single
supply
amplifiers — driving analog to digital converters and video
cable driving. The output stage of the LM7131 has been spe-
cially designed for the dynamic load presented by analog to
digital converters. The LM7131 is capable of a 4V output
range with a +5V single supply. The LM7131’s drive capabil-
ity and good differential gain and phase make quality video
possible from a small package with only a +5V supply.
BENEFITS OF THE LM7131
The LM7131 can make it possible to amplify high speed sig-
nals with a single +5V or +3V supply, saving the cost of split
power supplies.
EASY DESIGN PATH FROM ±5V to +5V SYSTEMS
The SO-8 package and similar ±5V and single supply speci-
fications means the LM7131 may be able to replace many
more expensive or slower op amps, and then be used for an
easy transition to 5V single supply systems. This could pro-
vide a migration path to lower voltages for the amplifiers in
system designs, reducing the effort and expense of testing
and re-qualifying different op amps for each new design.
In addition to providing a design migration path, the
SOT23-5 Tiny surface mount package can save valuable
board space.
SPECIFIC ADVANTAGES OF SOT23-5 (TINY PACKAGE)
The SOT23-5 (Tiny) package can save board space and al-
low tighter layouts. The low profile can help height limited de-
signs, such as sub-notebook computers, consumer video
equipment, personal digital assistants, and some of the
thicker PCMCIA cards. The small size can improve signal in-
tegrity in noisy environments by placing the amplifier closer
to the signal source. The tiny amp can fit into tight spaces
and weighs little. This makes it possible to design the
LM7131 into places where amplifiers could not previously fit.
The LM7131 can be used to drive coils and transformers ref-
erenced to virtual ground, such as magnetic tape heads and
disk drive write heads. The small size of the SOT23-5 pack-
age can allow it to be placed with a pre-amp inside of some
rotating helical scan video head (VCR) assemblies. This
avoids long cable runs for low level video signals, and can
result in higher signal fidelity.
Additional space savings parts are available in tiny packages
from National Semiconductor, including low power amplifi-
ers, precision voltage references, and voltage regulators.
Notes on Performance Curves and
Datasheet Limits
Important:
Performance curves represent an average of parts, and are
not limits.
SUPPLY CURRENT vs SUPPLY VOLTAGE
Note that this curve is nearly straight, and rises slowly as the
supply voltage increases.
INPUT CURRENT vs INPUT VOLTAGE
This curve is relatively flat in the 200 mV to 4V input range,
where the LM7131 also has good common mode rejection.
COMMON MODE VOLTAGE REJECTION
Note that there are two parts to the CMRR specification of
the datasheet for 3V and 5V. The common mode rejection
ratio of the LM7131 has been maximized for signals near
ground (typical of the active part of video signals, such as
those which meet the RS-170 levels). This can help provide
rejection of unwanted noise pick-up by cables when a bal-
anced input is used with good input resistor matching. The
mid-level CMRR is similar to that of other single supply op
amps.
BODE PLOTS (GAIN vs FREQUENCY FOR A
V = +1)
The gain vs. frequency plots for a non-inverting gain of 1
show the three voltages with the 150
load connected in two
ways. For the single supply graphs, the load is connected to
the most negative rail, which is ground. For the split supply
graphs, the load is connected to a voltage halfway between
the two supply rails.
DRIVING CABLES
Pulse response curves for driving 75
back terminate cables
are shown for both 3V and 5V supplies. Note the good pulse
fidelity with straight 150 loads, five foot (1.5 meter) and 75
foot (22 meter) cable runs. The bandwidth is reduced when
used in a gain of ten (A
V = +10). Even in a gain of ten con-
figuration, the output settles to < 1% in about 100 ns, mak-
ing this useful for amplifying small signals at a sensor or sig-
nal source and driving a cable to the main electronics section
which may be located away from the signal source. This will
reduce noise pickup.
Please refer to
Figures 1, 2, 3, 4, 5 for schematics of test set-
ups for cable driving.
www.national.com
10
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