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| 型號： | EL8178FWZ-T7A |
| 廠商： | Intersil |
| 文件頁數(shù)： | 2/13頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP SGL R-R I/O SOT23-6 |
| 標(biāo)準(zhǔn)包裝： | 250 |
| 放大器類型： | 通用 |
| 電路數(shù)： | 1 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 0.15 V/µs |
| 增益帶寬積： | 266kHz |
| 電流 - 輸入偏壓： | 1pA |
| 電壓 - 輸入偏移： | 50µV |
| 電流 - 電源： | 55µA |
| 電流 - 輸出 / 通道： | 31mA |
| 電壓 - 電源，單路/雙路(±)： | 2.4 V ~ 5.5 V，±1.2 V ~ 2.75 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | SOT-23-6 |
| 供應(yīng)商設(shè)備封裝： | SOT-23-6 |
| 包裝： | 帶卷 (TR) |
10
FN7504.7
May 14, 2008
effects of the disabled amplifiers’ feedback networks must be
considered when evaluating the active amplifier’s
performance in Mux Amp configurations.
Note that feed through from the IN+ to IN- pins occurs on
any Mux Amp disabled channel where the input differential
voltage exceeds 0.5V (e.g., active channel VOUT = 1V, while
disabled channel VIN = GND), so the mux implementation is
best suited for small signal applications. In any application
where two or more amplifier outputs are muxed, use series
IN+ resistors, or large value RFs in each amplifier to keep
the feed through current low enough to minimize the impact
on the active channel. See “Usage Implications” on page 10
for more details.
IN+ and IN- Input Protection
In addition to ESD protection diodes to each supply rail, the
EL8178 has additional back-to-back protection diodes across
the differential input terminals. If the magnitude of the
differential input voltage exceeds the diode’s VF, then one of
these diodes will conduct. For elevated temperatures, the
leakage of the protection diodes (see Circuit 1 in “Pin
Descriptions” on page 9) increases, resulting in the increase
USAGE IMPLICATIONS
If the input differential voltage is expected to exceed 0.5V, an
external current limiting resistor must be used to ensure the
input current never exceeds 5mA. For noninverting unity gain
applications, the current limiting can be via a series IN+ resistor,
or via a feedback resistor of appropriate value. For other gain
configurations, the series IN+ resistor is the best choice, unless
the feedback (RF) and gain setting (RG) resistors are both
sufficiently large to limit the input current to 5mA.
Large differential input voltages can arise from several
sources:
1. During open loop (comparator) operation. The IN+ and
IN- input voltages don’t track.
2. When the amplifier is disabled but an input signal is still
present. An RL or RG to GND keeps the IN- at GND, while
the varying IN+ signal creates a differential voltage. Mux
Amp applications are similar, except that the active
channel VOUT determines the voltage on the IN- terminal.
3. When the slew rate of the input pulse is considerably
faster than the op amp’s slew rate. If the VOUT can’t keep
up with the IN+ signal, a differential voltage results, and
visible distortion occurs on the input and output signals.
To avoid this issue, keep the input slew rate below
0.2V/s, or use appropriate current limiting resistors.
Large (>2V) differential input voltages can also cause an
increase in disabled ICC.
EN I
nput Protection
The EN input has internal ESD protection diodes to both the
positive and negative supply rails, limiting the input voltage
range to within one diode beyond the supply rails
(see “Circuit 2” diagram on page 9). If the input voltage is
expected to exceed V+ or V-, then an external series resistor
should be added to limit the current to 5mA.
Output Current Limiting
The EL8178 has no internal current-limiting circuitry. If the
output is shorted, it is possible to exceed the “Absolute
Maximum Rating” for “operating junction temperature”,
potentially resulting in the destruction of the device.
Power Dissipation
It is possible to exceed the +150°C maximum junction
temperature (TJMAX) under certain load and power-supply
conditions. It is therefore important to calculate TJMAX 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:
TMAX = Maximum ambient temperature
θJA = Thermal resistance of the package
PDMAX = Maximum power dissipation of the amplifier
VS = Supply voltage
IMAX = Maximum supply current of the amplifier
VOUTMAX = Maximum output voltage swing of the
application
RL = Load resistance
TJMAX
TMAX θJAxPDMAX
()
+
=
(EQ. 1)
PDMAX
VS ISMAX VS
(
- VOUTMAX)
VOUTMAX
RL
----------------------------
×
+
×
=
(EQ. 2)
EL8178
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