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| 型号： | ISL28258 |
| 厂商： | 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，微功率单/双精度轨对轨输入-输出(RRIO)，低输入偏流运放) |
| 中文描述： | 34μA微功耗单和双精密轨至轨输入，输出（RRIO）低输入偏置电流运算放大器（34μA，微功率单/双精度轨对轨输入-输出（RRIO），低输入偏流运放） |
| 文件页数： | 12/16页 |
| 文件大小： | 855K |
| 代理商： | ISL28258 |
12
FN6377.1
June 28, 2007
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 (V
OS
) as much as 1μV/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 (“Pin
Descriptions” on page 11 - Circuit 1
)
. For applications where
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 44).
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 10μA
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
V
OUT
= 1V, while disabled channel V
IN
= GND), so the mux
implementation is best suited for small signal applications. If
large signals are required, use series IN+ resistors, or large
value R
F
, to keep the feed through current low enough to
minimize the impact on the active channel. See “Limitations
of the Differential Input Protection” on page 12 for more
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 (R
F
) and gain setting (R
G
)
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 R
L
or R
G
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
V
OUT
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 V
OUT
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/
μ
s, or use
appropriate current limiting resistors.
Large (>2V) differential input voltages can also cause an
increase in disabled I
CC
.
FIGURE 44. INPUT CURRENT LIMITING
-
+
R
IN
R
L
V
IN
V
OUT
ISL28158, ISL28258
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| ISL28258FBZ | 功能描述:IC OPAMP RRIO PREC 68UA 8-SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:75 系列:MicroAmplifier™ 放大器类型:通用 电路数:1 输出类型:满摆幅 转换速率:0.03 V/µs 增益带宽积:100kHz -3db带宽:- 电流 - 输入偏压:1pA 电压 - 输入偏移:60µV 电流 - 电源:20µA 电流 - 输出 / 通道:5mA 电压 - 电源，单路/双路(±):2.3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:管件 |
| ISL28258FBZ-T7 | 功能描述:IC OPAMP RRIO PREC 68UA 8-SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 其它有关文件:TS1854A View All Specifications 标准包装:50 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.25 V/µs 增益带宽积:630kHz -3db带宽:- 电流 - 输入偏压:16nA 电压 - 输入偏移:1000µV 电流 - 电源:162µA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):1.8 V ~ 6 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SO 包装:管件 |
| ISL28258FUZ | 功能描述:IC OPAMP RRIO PREC 68UA 8-MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:75 系列:MicroAmplifier™ 放大器类型:通用 电路数:1 输出类型:满摆幅 转换速率:0.03 V/µs 增益带宽积:100kHz -3db带宽:- 电流 - 输入偏压:1pA 电压 - 输入偏移:60µV 电流 - 电源:20µA 电流 - 输出 / 通道:5mA 电压 - 电源，单路/双路(±):2.3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:管件 |
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