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參數(shù)資料
| 型號： | ISL28158 |
| 廠商： | Intersil Corporation |
| 英文描述： | 34μA Micro-power Single and Dual Precision Rail-to-Rail Input-Output (RRIO) Low Input Bias Current Op Amps(34μA，微功率單/雙精度軌對軌輸入-輸出(RRIO)，低輸入偏流運放) |
| 中文描述： | 34μA微功耗單和雙精密軌至軌輸入，輸出（RRIO）低輸入偏置電流運算放大器（34μA，微功率單/雙精度軌對軌輸入-輸出（RRIO），低輸入偏流運放） |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 855K |
| 代理商： | ISL28158 |
13
FN6377.1
June 28, 2007
Using Only One Channel
The ISL28258 is a dual op amp. If the application only
requires one channel, the user must configure the unused
channel to prevent it from oscillating. The unused channel
will oscillate if the input and output pins are floating. This will
result in higher than expected supply currents and possible
noise injection into the channel being used. The proper way
to prevent this oscillation is to short the output to the
negative input and ground the positive input (as shown in
Figure 45).
Current Limiting
These devices have no internal current-limiting circuitry. If
the output is shorted, it is possible to exceed the Absolute
Maximum Rating for output current or power dissipation,
potentially resulting in the destruction of the device.
Power Dissipation
It is possible to exceed the +125°C maximum junction
temperatures under certain load and power-supply
conditions. It is therefore important to calculate the
maximum junction temperature (T
JMAX
) for all applications
to determine if power supply voltages, load conditions, or
package type need to be modified to remain in the safe
operating area. These parameters are related in Equation 1:
where:
P
DMAXTOTAL
is the sum of the maximum power
dissipation of each amplifier in the package (PD
MAX
)
PD
MAX
for each amplifier can be calculated using
Equation 2:
where:
T
MAX
= Maximum ambient temperature
θ
JA
= Thermal resistance of the package
PD
MAX
= Maximum power dissipation of 1 amplifier
V
S
= Supply voltage (Magnitude of V
+
and V
-
)
I
MAX
= Maximum supply current of 1 amplifier
V
OUTMAX
= Maximum output voltage swing of the
application
R
L
= Load resistance
FIGURE 45. PREVENTING OSCILLATIONS IN UNUSED
CHANNELS
-
+
T
JMAX
T
MAX
θ
JA
xPD
MAXTOTAL
(
)
+
=
(EQ. 1)
PD
MAX
2*V
S
I
SMAX
V
S
(
- V
OUTMAX
)
V
L
----------------------------
×
+
×
=
(EQ. 2)
ISL28158, ISL28258
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL28158_08 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Micro-power Single and Dual Precision Rail-to-Rail Input-Output (RRIO) Low Input Bias Current Op Amps |
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