参数资料
| 型号： | ISL28278FAZ |
| 厂商： | Intersil |
| 文件页数： | 4/16页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP DUAL RRIO PREC 16-QSOP |
| 标准包装： | 97 |
| 放大器类型： | 通用 |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 0.14 V/µs |
| 增益带宽积： | 300kHz |
| 电流 - 输入偏压： | 10pA |
| 电压 - 输入偏移： | 0.2µV |
| 电流 - 电源： | 120µA |
| 电流 - 输出 / 通道： | 31mA |
| 电压 - 电源，单路/双路(±)： | 2.4 V ~ 5.5 V，±1.2 V ~ 2.75 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 管件 |
| 产品目录页面： | 1235 (CN2011-ZH PDF) |
ISL28278, ISL28478
12
FN6145.4
August 16, 2011
Applications Information
The ISL28278 and ISL28478 are dual and quad CMOS rail-to-rail
input, output (RRIO) micropower operational amplifiers. These
devices are designed to operate from a single supply (2.4V to
5.5V) or dual supplies (±1.2V to ±2.75V) while drawing only
120A (ISL28278) of supply current. This combination of low
power and precision performance makes these devices suitable
for solar and battery power applications.
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 ISL28278 achieves input rail-to-rail without sacrificing
important precision specifications and degrading distortion
performance. The input offset voltage exhibits smooth behavior
throughout the entire common-mode input range. The input bias
current versus the common-mode voltage range has undistorted
behavior typically from 100mV below the negative rail and 10%
higher than the V+ rail (0.5V higher than V+ when V+ equals 5V).
Input Protection
All input terminals have internal ESD protection diodes to the
positive and negative supply rails, limiting the input voltage to
within one diode beyond the supply rails. There is an additional
pair of back-to-back diodes across the input terminals. For
applications in which the input differential voltage is expected to
exceed 0.5V, external series resistors must be used to ensure the
input currents never exceed 5mA (as shown in Figure 39).
Rail-to-Rail Output
A pair of complementary MOSFET devices are used to achieve the
rail-to-rail output swing. The NMOS sinks current to swing the output
in the negative direction. The PMOS sources current to swing the
output in the positive direction. Both parts, with a 100k
Ω load,
typically swing to within 4mV of the positive supply rail and within
3mV of the negative supply rail.
Enable/Disable Feature
The ISL28278 offers two EN pins (EN_A and EN_B) which disable
the op amp when pulled up to at least 2.0V. In the disabled state
(output in a high impedance state), the part typically consumes
4A. By disabling the part, multiple parts can be connected
together as a MUX. The outputs are tied together in parallel, and
a channel can be selected by the EN pins. The loading effects of
the feedback resistors of the disabled amplifier must be
considered when multiple amplifier outputs are connected
together. The EN pin also has an internal pull-down. If left open,
the EN pin pulls to the negative rail, and the device is enabled by
default.
Using Only One Channel
The ISL28278 and ISL28478 are dual and quad channel
op amps. If the application requires only one channel when using
the ISL28278 or fewer than four channels when using the
ISL28478, the user must configure any unused channels to
prevent them from oscillating. Unused channels oscillate if the
input and output pins are floating, resulting in higher than
FIGURE 38. -SLEW RATE vs TEMPERATURE, VOUT = ±1.5V, AV = +2
Typical Performance Curves V
+ = 5V, V
- = 0V, VCM = 2.5V, RL = Open, unless otherwise specified. (Continued)
-SLEW
RATE
(V/
s)
0.10
0.11
0.12
0.13
0.14
0.15
0.16
0.17
0.18
0.19
0.20
MAX
MIN
N = 1000
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
MEDIAN
FIGURE 39. INPUT ESD DIODE CURRENT LIMITING - UNITY GAIN
-
+
RIN
RL
VIN
VOUT
V+
V-
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相关代理商/技术参数 |
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| ISL28278FAZ-T7 | 功能描述:IC OPAMP DUAL RRIO PREC 16-QSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 其它有关文件:Automotive Product Guide 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 放大器类型:通用 电路数:1 输出类型:满摆幅 转换速率:3 V/µs 增益带宽积:10MHz -3db带宽:- 电流 - 输入偏压:1pA 电压 - 输入偏移:70µV 电流 - 电源:2.5mA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:Digi-Reel® 其它名称:MAX4475AUT#TG16DKR |
| ISL28278FAZ-TZ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| ISL28286 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Dual and Quad Micropower Single Supply Dual and Quad Micropower Single Supply Precision Op Amp |
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| ISL28286EVAL1Z | 功能描述:EVALUATION BOARD FOR ISL28286 RoHS:是 类别:编程器，开发系统 >> 评估板 - 运算放大器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- |
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