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參數(shù)資料
| 型號： | 5962L0620602VZA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運算放大器 |
| 英文描述： | DUAL OP-AMP, 60 uV OFFSET-MAX, 3 MHz BAND WIDTH, CDSO10 |
| 封裝： | CERAMIC, SOIC-10 |
| 文件頁數(shù)： | 13/14頁 |
| 文件大?。?/td> | 365K |
| 代理商： | 5962L0620602VZA |
20182204
FIGURE 3.
INPUT CURRENTS
The LMP2012's input currents are different than standard
bipolar or CMOS input currents in that it appears as a current
flowing in one input and out the other. Under most operating
conditions, these currents are in the picoamp level and will
have little or no effect in most circuits. These currents tend to
increase slightly when the common-mode voltage is near the
minus supply. At high temperatures, the input currents be-
come larger, 0.5 nA typical, and are both positive except when
the V
CM is near V
. If operation is expected at low common-
mode voltages and high temperature, do not add resistance
in series with the inputs to balance the impedances. Doing
this can cause an increase in offset voltage. A small resis-
tance such as 1 k
can provide some protection against very
large transients or overloads, and will not increase the offset
significantly.
PRECISION STRAIN-GAUGE AMPLIFIER
This Strain-Gauge amplifier (Figure 4) provides high gain
(1006 or ~60 dB) with very low offset and drift. Using the re-
sistors' tolerances as shown, the worst case CMRR will be
greater than 108 dB. The CMRR is directly related to the re-
sistor mismatch. The rejection of common-mode error, at the
output, is independent of the differential gain, which is set by
R3. The CMRR is further improved, if the resistor ratio match-
ing is improved, by specifying tighter-tolerance resistors, or
by trimming.
20182218
FIGURE 4.
Extending Supply Voltages and Output Swing by Using a
Composite Amplifier Configuration:
In cases where substantially higher output swing is required
with higher supply voltages, arrangements like the ones
urations utilize the excellent DC performance of the LMP2012
while at the same time allow the superior voltage and fre-
quency capabilities of the LM6171 to set the dynamic perfor-
mance of the overall amplifier. For example, it is possible to
achieve ±12V output swing with 300 MHz of overall GBW
(A
V = 100) while keeping the worst case output shift due to
V
OS less than 4 mV. The LMP2012 output voltage is kept at
about mid-point of its overall supply voltage, and its input
common mode voltage range allows the V- terminal to be
grounded in one case (Figure 5, inverting operation) and tied
to a small non-critical negative bias in another (Figure 6, non-
inverting operation). Higher closed-loop gains are also pos-
sible with a corresponding reduction in realizable bandwidth.
Table 1 shows some other closed loop gain possibilities along
with the measured performance in each case.
www.national.com
8
LMP2012QML
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