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| 型號： | ISL28158EVAL1Z |
| 廠商： | Intersil |
| 文件頁數(shù)： | 7/19頁 |
| 文件大?。?/td> | 0K |
| 描述： | EVALUATION BOARD FOR ISL28158 |
| 產(chǎn)品培訓(xùn)模塊： | Solutions for Industrial Control Applications |
| 標準包裝： | 1 |
| 每 IC 通道數(shù)： | 1 - 單 |
| 放大器類型： | 通用 |
| 輸出類型： | 單端，滿擺幅 |
| 轉(zhuǎn)換速率： | 0.1 V/µs |
| -3db帶寬： | 420kHz |
| 電流 - 輸出 / 通道： | 30mA |
| 工作溫度： | -40°C ~ 125°C |
| 電流供應(yīng)（主 IC）： | 34µA |
| 電壓 - 電源，單路/雙路(±)： | 2.4 V ~ 5.5 V，±1.2 V ~ 2.75 V |
| 板類型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ISL28158 |
15
FN6377.4
January 17, 2014
Applications Information
Introduction
The ISL28158 is a single CMOS rail-to-rail input, output
(RRIO) operational amplifier with an enable feature. The
ISL28258 is a dual version without the enable feature. Both
devices are designed to operate from single supply (2.4V to
5.5V) or dual supplies (±1.2V to ±2.75V).
Rail-to-Rail Input/Output
These devices feature PMOS inputs with an input common
mode range that extends up to 0.3V beyond the V+ rail, and
to 0.1V below the V- rail. The CMOS output features
excellent drive capability, typically swinging to within 6mV of
either rail with a 100k
Ω load.
Results of Over-Driving the Output
Caution should be used when over-driving the output for
long periods of time. Over-driving the output can occur in two
ways 1) The input voltage times the gain of the amplifier
exceeds the supply voltage by a large value or, 2) the output
current required is higher than the output stage can deliver.
These conditions can result in a shift in the Input Offset
Voltage (VOS) as much as 1V/hr. of exposure under these
conditions.
IN+ and IN- Input Protection
All input terminals have internal ESD protection diodes to both
positive and negative supply rails, limiting the input voltage to
within one diode beyond the supply rails. They also contain
back-to-back diodes across the input terminals (see “Pin
the input differential voltage is expected to exceed 0.5V, an
external series resistor must be used to ensure the input
currents never exceed 5mA (Figure 47).
Enable/Disable Feature
The ISL28158 offers an EN pin that disables the device
when pulled up to at least 2.0V. In the disabled state (output
in a high impedance state), the part consumes typically 10A
at room temperature. By disabling the part, multiple
ISL28158 parts can be connected together as a MUX. In this
configuration, the outputs are tied together in parallel and a
channel can be selected by the EN pin. The loading effects
of the feedback resistors of the disabled amplifier must be
considered when multiple amplifier outputs are connected
together. 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. If
large signals are required, use series IN+ resistors, or large
value RF, to keep the feed through current low enough to
minimize the impact on the active channel. See “Limitations
details. The EN pin also has an internal pull-down. If left
open, the EN pin will pull to the negative rail and the device
will be enabled by default. When not used, the EN pin should
either be left floating or connected directly to the -V pin.
Limitations of the Differential Input Protection
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 non-inverting 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. Used this way,
the IN+ and IN- voltages don’t track, so differentials arise.
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 0.1V/s, or use
appropriate current limiting resistors.
Large (>2V) differential input voltages can also cause an
increase in disabled ICC.
FIGURE 47. INPUT CURRENT LIMITING
-
+
RIN
RL
VIN
VOUT
ISL28158, ISL28258
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