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LMV116 データシート(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
部品番号 LMV116
部品情報  Low Voltage, 45MHz, Rail-to-Rail Output Operational Amplifiers with Shutdown Option
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMV116 データシート(HTML) 9 Page - National Semiconductor (TI)

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Typical Performance Characteristics At T
J = 25˚C. Unless otherwise specified. (Continued)
Souce Current vs. V
OUT
20080711
Application Notes
CIRCUIT DESCRIPTION
The LMV116 and LMV118 are based on National Semicon-
ductor’s proprietary VIP10 dielectrically isolated bipolar pro-
cess.
The LMV116 and LMV118 architecture features the follow-
ing:
Complimentary bipolar devices with exceptionally high f
t
(
∼8GHz) even under low supply voltage (2.7V) and low
Collector bias current.
Common Emitter push-pull output stage capable of 20mA
output current (at 0.5V from the supply rails) while con-
suming only 600µA of total supply current. This architec-
ture allows output to reach within milli-volts of either
supply rail at light loads.
Consistent performance from any supply voltage (2.7V-
10V) with little variation with supply voltage for the most
important specifications (e.g. BW, SR, I
OUT, etc.)
MICRO-POWER SHUTDOWN
The LMV118 can be shutdown to save power and reduce its
supply current to less than 50µA guaranteed, by applying a
voltage to the SD pin. The SD pin is “active high” and needs
to be tied to V
for normal operation. This input is low current
(<20µA, 4pF equivalent capacitance) and a resistor to V
(
≤20kΩ) will result in normal operation. Shutdown is guaran-
teed when SD pin is 0.4V or less from V
+ at any operating
supply voltage and temperature.
In the shutdown mode, essentially all internal device biasing
is turned off in order to minimize supply current flow and the
output goes into Hi-Z (high impedance) mode. Complete
device Turn-on and Turn-off times vary considerably relative
to the output loading conditions, output voltage, and input
impedance, but is generally limited to less than 1µs (see
tables for actual data).
During shutdown, the input stage has an equivalent circuit as
shown below in Figure 1
As can be seen above, in shutdown, there may be current
flow through the internal diodes shown, caused by input
potential, if present. This current may flow through the exter-
nal feedback resistor and result in an apparent output signal.
In most shutdown applications the presence of this output is
inconsequential. However, if the output is “forced” by another
device such as in a multiplexer, the other device will need to
conduct the current described in order to maintain the output
potential.
To keep the output at or near ground during shutdown when
there is no other device to hold the output low, a switch
(transistor) could be used to shunt the output to ground.
Figure 2 shows a circuit where a NPN bipolar is used to keep
the output near ground (
∼80mV):
20080756
FIGURE 1. LMV118 Equivalent Input in Shutdown Mode
www.national.com
9


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