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| 型号： | ISL28138 |
| 厂商： | Intersil Corporation |
| 英文描述： | 4.5MHz, Single and Dual Precision Rail-to-Rail Input-Output (RRIO) Op Amps with Very Low Input Bias Current(具有极低输入偏流的4.5MHz, 单/双精度轨对轨输入-输出(RRIO)运放) |
| 中文描述： | 4.5MHz，单和双精密轨至轨输入，输出（RRIO）运算放大器，极低的输入偏置电流（具有极低输入偏流的4.5MHz，单/双精度轨对轨输入-输出（RRIO）运放） |
| 文件页数： | 13/16页 |
| 文件大小： | 861K |
| 代理商： | ISL28138 |
13
FN6336.1
June 28, 2007
Proper Layout Maximizes Performance
To achieve the maximum performance of the high input
impedance and low offset voltage, care should be taken in
the circuit board layout. The PC board surface must remain
clean and free of moisture to avoid leakage currents
between adjacent traces. Surface coating of the circuit board
will reduce surface moisture and provide a humidity barrier,
reducing parasitic resistance on the board. When input
leakage current is a concern, the use of guard rings around
the amplifier inputs will further reduce leakage currents.
Figure
44 shows a guard ring example for a unity gain
amplifier that uses the low impedance amplifier output at the
same voltage as the high impedance input to eliminate
surface leakage. The guard ring does not need to be a
specific width, but it should form a continuous loop around
both inputs. For further reduction of leakage currents,
components can be mounted to the PC board using Teflon
standoff insulators.
Current Limiting
The ISL28138 and ISL28238 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 +150°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 as shown in
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
IN
V+
FIGURE 44. GUARD RING EXAMPLE FOR UNITY GAIN
AMPLIFIER
HIGH IMPEDANCE INPUT
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)
ISL28138, ISL28238
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PDF描述 |
|---|---|
| ISL28238 | 4.5MHz, Single and Dual Precision Rail-to-Rail Input-Output (RRIO) Op Amps with Very Low Input Bias Current(具有极低输入偏流的4.5MHz, 单/双精密轨对轨输入-输出(RRIO)运放) |
| ISL28158 | 34μA Micro-power Single and Dual Precision Rail-to-Rail Input-Output (RRIO) Low Input Bias Current Op Amps(34μA，微功率单/双精度轨对轨输入-输出(RRIO)，低输入偏流运放) |
| ISL28258 | 34μA Micro-power Single and Dual Precision Rail-to-Rail Input-Output (RRIO) Low Input Bias Current Op Amps(34μA，微功率单/双精度轨对轨输入-输出(RRIO)，低输入偏流运放) |
| ISL28476 | Dual and Quad Micropower Single Supply Rail-to-Rail Input and Output (RRIO) Precision Op Amp(双/四通道，微功率，单电源，轨对轨输入/输出(RRIO)精密运放) |
| ISL28276 | Dual and Quad Micropower Single Supply Rail-to-Rail Input and Output (RRIO) Precision Op Amp(双/四通道，微功率，单电源，轨对轨输入/输出(RRIO)精密运放) |
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