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參數資料
| 型號： | LMV422 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Dual Rail-to-Rail Output Operational Amplifier with |
| 中文描述： | 雙軌至軌輸出運算放大器 |
| 文件頁數： | 9/10頁 |
| 文件大小： | 761K |
| 代理商： | LMV422 |
Application Information
(Continued)
AC COUPLED CIRCUITS
The two power modes makes the LMV422 ideal for AC
coupled circuit where the circuit needs to be kept active to
maintain a quiescent charge on the coupling capacitors with
minimum power consumption.
Figure 4
shows a schematic of an inverting and non-inverting
AC coupled amplifiers using the LMV422 with the PS pins
controlled by I/O ports of a microcontroller.
The advantage of the low power active mode for AC coupled
amplifiers is the elimination of the time needed to re-
establish a quiescent operating point when the amplifier is
switched to a full power mode. When amplifiers without a low
power active mode are used in low power applications, there
are two ways to minimize power consumption. The first is
turning off the amplifiers by switching off power to the op
amps using a transistor switch. The second is using an
amplifier with a shut down pin. Both of these methods have
the problem of allowing the coupling capacitors, C1, C2, C3,
C4, and C5, to discharge the quiescent DC voltage stored on
them when placed in the shut down state. When the ampli-
fiers are turned on again, the quiescent DC voltages must
reestablish themselves. During this time, the amplifier’s out-
put is not usable because the output signal is a mixture of the
amplified input signal and the charging voltage on the cou-
pling capacitors. The settling time can range from a several
milliseconds to several seconds depending on the resistor
and capacitor values.
When the LMV422 is placed into the low power mode the
power consumption is minimal but the amplifier is active to
maintain the quiescent DC voltage on the coupling capaci-
tors and the transition back to the operational high power
mode is fast, within few hundred nanoseconds. The active
low power mode of the LMV422 separates the two critical
aspects of a low power AC amplifier design. The values of
the gain resistors, bias resistors, and coupling capacitors
can be chosen independently of the turn on and stabilization
time.
RESISTIVE LOAD
The LMV422 has a minimum current drive of 3 mA in full
power mode. The minimum resistive load should be 10 k
The current drive in the low power mode is 140 uA, the
minimum resistive load should be 100 k
.
20109825
Figure 3a
20109826
Figure 3b
FIGURE 3.
20109834
FIGURE 4.
L
www.national.com
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| LMV431_05 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low-Voltage (1.24V) Adjustable Precision Shunt |
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