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参数资料
| 型号： | ISL28236 |
| 厂商： | Intersil Corporation |
| 英文描述： | 5MHz, Single and Dual Precision Rail-to-Rail Input-Output (RRIO) Op Amps(5MHz,单/双精密轨对轨输入-输出(RRIO)运放) |
| 中文描述： | 5MHz的，单和双精密轨至轨输入，输出（RRIO）运算放大器（5MHz的，单/双精密轨对轨输入-输出（RRIO）运放） |
| 文件页数： | 11/15页 |
| 文件大小： | 790K |
| 代理商： | ISL28236 |
11
FN6153.2
June 28, 2007
Applications Information
Introduction
The ISL28136 and ISL28236 are single and dual channel Bi-
CMOS rail-to-rail input, output (RRIO) micropower precision
operational amplifiers. The parts are designed to operate
from single supply (2.4V to 5.5V) or dual supply (±1.2V to
±2.75V). The parts have an input common mode range that
extends 0.25V above the positive rail and down to the
negative supply rail. The output operation can swing within
about 3mV of the supply rails with a 100k
Ω
load.
Rail-to-Rail Input
Many rail-to-rail input stages use two differential input pairs,
a long-tail PNP (or PFET) and an NPN (or NFET). Severe
penalties have to be paid for this circuit topology. As the
input signal moves from one supply rail to another, the
operational amplifier switches from one input pair to the
other causing drastic changes in input offset voltage and an
undesired change in magnitude and polarity of input offset
current.
The ISL28136 and ISL28236 achieve input rail-to-rail
operation without sacrificing important precision
specifications and degrading distortion performance. The
devices’ input offset voltage exhibits a smooth behavior
throughout the entire common-mode input range. The input
bias current versus the common-mode voltage range gives
an undistorted behavior from typically down to the negative
rail to 0.25V higher than the positive rail.
Rail-to-Rail Output
A pair of complementary Bi-polar devices are used to
achieve the rail-to-rail output swing. The PNP sinks current
to swing the output in the negative direction. The NPN
sources current to swing the output in the positive direction.
The ISL28136 and ISL28236 with a 100k
Ω
load will swing to
within 3mV of the positive supply rail and within 3mV of the
negative supply rail.
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 10 - 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 38).
Enable/Disable Feature
The ISL28136 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. The EN pin 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. The EN pin should never
be left floating. When not used, the EN pin should either be
left floating or connected to the V- pin.
By disabling the part, multiple ISL28136 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 a large value R
F
, to
keep the feed through current low enough to minimize the
impact on the active channel. See the “Limitations of the
Differential Input Protection” section for more details.
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.
FIGURE 38. INPUT CURRENT LIMITING
-
+
R
IN
R
L
V
IN
V
OUT
ISL28136, ISL28236
相关PDF资料 |
PDF描述 |
|---|---|
| ISL28138 | 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) |
| 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) |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL28236 WAF | 制造商:Intersil Corporation 功能描述: |
| ISL28236FBZ | 功能描述:IC OPAMP RRIO DUAL 5MHZ 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 |
| ISL28236FBZ-T7 | 功能描述:IC OPAMP RRIO DUAL 5MHZ 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 |
| ISL28236FUZ | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:5MHz, Dual Precision Rail-to-Rail Input-Output (RRIO) Op Amp |
| ISL28236FUZ-T7 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:5MHz, Dual Precision Rail-to-Rail Input-Output (RRIO) Op Amp |
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