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參數(shù)資料
| 型號： | LMV921 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 1.8V, 1MHz, Low Power Operational Amplifiers with Rail-To-Rail Input and Output |
| 中文描述： | 1.8，1MHz的，低功耗運算放大器具有軌至軌輸入和輸出 |
| 文件頁數(shù)： | 16/27頁 |
| 文件大小： | 736K |
| 代理商： | LMV921 |
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Application Note
(Continued)
This V
crossover point can create problems for both DC
and AC coupled signals if proper care is not taken. For large
input signals that include the V
crossover point in their dy-
namic range, this will cause distortion in the output signal.
One way to avoid such distortion is to keep the signal away
from the crossover. For example, in a unity gain buffer con-
figuration and with V
= 5V, a 5V peak-to-peak signal will
contain input-crossover distortion while a 3V peak-to-peak
signal centered at 1.5V will not contain input-crossover dis-
tortion as it avoids the crossover point. Another way to avoid
large signal distortion is to use a gain of 1 circuit which
avoids any voltage excursions at the input terminals of the
amplifier. In that circuit, the common mode DC voltage can
be set at a level away from the V
OS
cross-over point.
For small signals, this transition in V
shows up as a V
dependent spurious signal in series with the input signal and
can effectively degrade small signal parameters such as
gain and common mode rejection ratio. To resolve this prob-
lem, the small signal should be placed such that it avoids the
V
OS
crossover point.
In addition to the rail-to-rail performance, the output stage
can provide enough output current to drive 600
loads. Be-
cause of the high current capability, care should be taken not
to exceed the 150C maximum junction temperature specifi-
cation.
5.0 Power-Supply Considerations
The LMV921/LMV922/LMV924 are ideally suited for use with
most battery-powered systems. The LMV921/LMV922/
LMV924 operate from a single +1.8V to +5.0V supply and
consumes about 145μA of supply current per Amplifier. A
high power supply rejection ratio of 78dB allows the amplifier
to be powered directly off a decaying battery voltage extend-
ing battery life.
Table 1 lists a variety of typical battery types. Batteries have
different voltage ratings; operating voltage is the battery volt-
age under nominal load. End-of-Life voltage is defined as the
voltage at which 100% of the usable power of the battery is
consumed. Table 1 also shows the typical operating time of
the LMV921.
6.0 Distortion
The two main contributors of distortion in LMV921/LMV922/
LMV924 family is:
1. Output crossover distortion occurs as the output transi-
tions from sourcing current to sinking current.
2. Input crossover distortion occurs as the input switches
from NPN to PNP transistor at the input stage.
To decrease crossover distortion:
1. Increase the load resistance. This lowers the output cross-
over distortion but has no effect on the input crossover dis-
tortion.
2. Operate from a single supply with the output always
sourcing current.
3. Limit the input voltage swing for large signals between
ground and one volt below the positive supply.
4. Operate in inverting configuration to eliminate common
mode induced distortion.
5.Avoid small input signal around the input crossover region.
The discontinuity in the offset voltage will effect the gain,
CMRR and PSRR.
TABLE 1. LMV921 Characteristics with Typical Battery Systems.
Battery Type
Operating
Voltage (V)
End-of-Life
Voltage (V)
Capacity AA
Size (mA -
h)
1000
1000
375
500
LMV921
Operating
time (Hours)
6802
6802
2551
3401
Alkaline
Lithium
Ni - Cad
NMH
1.5
2.7
1.2
1.2
0.9
2.0
0.9
1.0
L
www.national.com
16
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相關代理商/技術參數(shù) |
參數(shù)描述 |
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| LMV921_QUAL | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:1.8V RR I/O Op Amp |
| LMV921A WAF | 制造商:Texas Instruments 功能描述: |
| LMV921EVAL | 功能描述:EVALUATION BOARD FOR LMV921 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 運算放大器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- |
| LMV921M5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LMV921M5X | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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