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參數(shù)資料
| 型號(hào)： | LM6310 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | High Speed Low Power Operational Amplifier with TRI-STATE Output |
| 中文描述： | 高速低功耗運(yùn)算放大器具有三態(tài)輸出 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 279K |
| 代理商： | LM6310 |
Application Information
GENERAL INFORMATION
The LM6310 is a high speed complementary bipolar amplifi-
er with good video performance. The output of the LM6310
can be turned off with a logic level signal on the DISABLE
pin. The output then goes to a high impedance state
(TRI-STATE) which makes it easy to multiplex signals with
the LM6310. The LM6310 responds very quickly to the DIS-
ABLE input, (under 25 ns) making it useful for video effects
and adding or selecting data from video streams, such as
TELTEXT.
Note:
The LM6310 will operate normally when there is no connection to the
DISABLE pin.
The LM6310 has low power consumption for a high speed
part, typically
k
4.0 mA. When the output is disabled the
typical current consumption drops below 1.0 mA. This
makes the LM6310 ideal for portable video equipment.
The LM6310 is available in two package types: DIPs for
through hole designs, and SO-8 surface mount packages.
The LM6310 uses a current feedback design to achieve
good video performance at low current and low cost.
Benefits of the LM6310
The LM6310 provides good video performance for consum-
er and portable applications at low current and low cost.
The disable option can reduce power consumption in porta-
ble applications.
The video multiplexing capability of the disable function can
also be used to improve the testability of systems by provid-
ing an easy means to open the analog signal path and insert
test or reference signals.
Since the multiplexing configuration is a function of the out-
put and disable signal wiring, using multiple LM6310’s has
some strong advantages over a one chip video multiplexer.
First, larger multiplexers are possibleDwith careful layout,
up to 8 video inputs can be multiplexed.
Frequently in multiplexer designs, one or more of the input
signals will need to be buffered with an amplifier, and the
output may also need a buffer or driver amplifier. Wiring up
LM6310s to do multiplexing lets the LM6310 act as both the
input buffer and the output driver. This can reduce parts and
save money. In addition to reducing cost, the signals will go
through fewer amplifiers. This can mean improved signal
quality in addition to lower cost.
DESIGN ADAPTABILITY AND SYSTEM
DESIGN FLEXIBILITY
Using the LM6310 allows more adaptable, cost effective de-
sign. If you need a 3 input multiplexer, you can make one,
avoiding the extra cost of unused devices of quad multiplex-
er. If you need a 5 input multiplexer, you can design this with
5 LM6310s, saving the space and cost of two video multi-
plexer chips.
Using the LM6310 on a distributed multiplexer can improve
manufacturing flexibility. You can design a low cost system
with the minimal number functions needed for the low end
of the market. Additional functions (close captioning,
TELETEXT, digital video, information services, etc.) can be
designed on to add-in cards. Since the LM6310 will operate
normally when the DISABLE input is floating (no con-
nection), the additional functions can be built on the add-in
cards. By using LM6310s on both the basic board and the
add-in cards, video and other signals can be digitally
switched to implement the new add-in functions. Using
LM6310s avoids adding the cost of a dedicated multiplexer
in the low cost system, and increases design flexibility.
EASY TO USE, COST-EFFECTIVE CURRENT FEEDBACK
When used with good high speed layout in a circuit like
those shown in the section on typical performance curves,
the LM6310 will provide wide bandwidth, high slew and
good video performance. Modern current feedback devices
can provide higher bandwidth at lower current and at lower
cost than conventional voltage feedback devices.
Note on Performance Curves and
Datasheet Limits
Important:
Performance curves represent an average of parts, and are not
limits.
COMMON MODE REJECTION RATIO
The CMRR of 50 dB is valid for inputs which are within 1V of
ground for
g
5V supplies. In other words, the input should
be within 1V of the center of the V
a
and V
b
power supply
rails. Moving the inputs away from the center of the supplies
will result in reduced performance and non-linearities.
NON-INVERTING (
a
) INPUT
CURRENT vs TEMPERATURE
This curve is relatively flat over temperature (typically under
1
m
A), that even an input source impedance of 2 k
X
will
result in only a millivolt shift on the input voltage.
OUTPUT VOLTAGE SWING vs LOAD
This curve shows that almost all of the output swing is avail-
able for the 150
X
loads usually used in back-terminated
75
X
video systems.
OUTPUT SIGNAL ISOLATION IN DISABLE MODE
The top graph shows the spectrum analyzer output of an
LM6310 in normal operaiton. The 4 MHz peak has an ampli-
tude of 69 mV. Note that the reference level is 100 millivolts
(100 mV), second and third harmonics are present, and the
noise floor is towards the bottom of the graph.
With the LM6310 disabled, we need to greatly increase the
gain of the spectrum analyzer to see the feedthrough of the
4 MHz signal. Note that the reference level is now 50 micro-
volts (50
m
V) and the noise floor is towards the middle of
the graph. The 4 MHz signal now has an amplitude of
28.9
m
V, less than one-thousandth the normal signal.
Note that the LM6310 will function normally (output on) with
the DISABLE input (pin 8) left floating (not connected).
PULSE RESPONSE AND GAIN vs FREQUENCY
FOR A
V
e a
1
The feedback resistor (R
F
) value for the pulse response
photo is 1 k
X
. A value of 1 k
X
to 2 k
X
is recommended for
all voltage follower (A
V
e a
1) circuits using the LM6310.
The gain and phase plot for A
V
e a
1 was done with the
usual value of R
F
e
348
X
for comparison with the other
gain and phase plots.
http://www.national.com
11
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| LM6310IMX | High Speed Low Power Operational Amplifier with TRI-STATE Output |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM6310IM | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Speed Low Power Operational Amplifier with TRI-STATE Output |
| LM6310IMX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Speed Low Power Operational Amplifier with TRI-STATE Output |
| LM6310IN | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Speed Low Power Operational Amplifier with TRI-STATE Output |
| LM6311 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LM6311IN | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Low Noise High Speed Voltage Feedback Operational Amplifier |
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