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参数资料
| 型号： | ISL43840IR |
| 厂商： | INTERSIL CORP |
| 元件分类： | 运动控制电子 |
| 英文描述： | Low-Voltage, Single and Dual Supply, Dual 4 to 1 Multiplexer Analog Switch with Enable |
| 中文描述： | DUAL 4-CHANNEL, SGL ENDED MULTIPLEXER, PQCC20 |
| 封装： | 4 X 4 MM, PLASTIC, MO-220VGGD-1, QFN-20 |
| 文件页数： | 10/14页 |
| 文件大小： | 505K |
| 代理商： | ISL43840IR |
10
Detailed Description
The ISL43840 analog switch offers a precise switching
capability from a bipolar
±
2V to
±
6V or a single 2V to 12V
supply with low on-resistance (39
) and high speed
operation (t
ON
= 38ns, t
OFF
= 19ns) with dual 5V supplies.
It has an enable bar pin to simultaneously open all signal
paths.
The device is especially well suited for applications using
±
5V supplies. With
±
5V supplies the performance (R
ON
,
Leakage, Charge Injection, ect.) is best in class.
High frequency applications also benefit from the wide
bandwidth, and the very high off isolation and crosstalk
rejection.
Supply Sequencing And Overvoltage Protection
With any CMOS device, proper power supply sequencing is
required to protect the device from excessive input currents
which might permanently damage the IC. All I/O pins contain
ESD protection diodes from the pin to V+ and to V-(see
Figure 8). To prevent forward biasing these diodes, V+ and
V- must be applied before any input signals, and input signal
voltages must remain between V+ and V-. If these conditions
cannot be guaranteed, then one of the following two
protection methods should be employed.
Logic inputs can easily be protected by adding a 1k
resistor in series with the input (see Figure 8). The resistor
limits the input current below the threshold that produces
permanent damage, and the sub-microamp input current
produces an insignificant voltage drop during normal
operation.
This method is not applicable for the signal path inputs.
Adding a series resistor to the switch input defeats the
purpose of using a low R
ON
switch, so two small signal
diodes can be added in series with the supply pins to provide
overvoltage protection for all pins (see Figure 8). These
additional diodes limit the analog signal from 1V below V+ to
1V above V-. The low leakage current performance is
unaffected by this approach, but the switch resistance may
increase, especially at low supply voltages.
Power-Supply Considerations
The ISL43840 construction is typical of most CMOS analog
switches, in that they have three supply pins: V+, V-, and
GND. V+ and V- drive the internal CMOS switches and set
their analog voltage limits, so there are no connections
between the analog signal path and GND. Unlike switches
with a 13V maximum supply voltage, the ISL43840 15V
maximum supply voltage provides plenty of room for the
10% tolerance of 12V supplies (
±
6V or 12V single supply),
as well as room for overshoot and noise spikes.
This switch device performs equally well when operated with
bipolar or single voltage supplies.The minimum
recommended supply voltage is 2V or
±
2V. It is important to
note that the input signal range, switching times, and on-
resistance degrade at lower supply voltages. Refer to the
electrical specification tables and
Typical Performance
Curves
for details.
V+ and GND power the internal logic (thus setting the digital
switching point) and level shifters. The level shifters convert
the logic levels to switched V+ and V- signals to drive the
analog switch gate terminals.
Logic-Level Thresholds
V+ and GND power the internal logic stages, so V- has no
affect on logic thresholds. This switch family is TTL
compatible (0.8V and 2.4V) over a V+ supply range of 2.7V
to 10V. At 12V the V
IH
level is about 3.3V. This is still below
the CMOS guaranteed high output minimum level of 4V, but
noise margin is reduced. For best results with a 12V supply,
use a logic family that provides a V
OH
greater than 4V.
The digital input stages draw supply current whenever the
digital input voltage is not at one of the supply rails. Driving
the digital input signals from GND to V+ with a fast transition
time minimizes power dissipation.
High-Frequency Performance
In 50
systems, signal response is reasonably flat even past
100MHz (see Figures 17 and 18). Figures 17 and 18 also
illustrates that the frequency response is very consistent
over varying analog signal levels.
An OFF switch acts like a capacitor and passes higher
frequencies with less attenuation, resulting in signal feed
through from a switch’s input to its output. Off Isolation is the
resistance to this feed through, while Crosstalk indicates the
amount of feed through from one switch to another.
Figure 19 details the high Off Isolation and Crosstalk
rejection provided by this family. At 10MHz, Off Isolation is
about 55dB in 50
systems, decreasing approximately 20dB
per decade as frequency increases. Higher load
impedances decrease Off Isolation and Crosstalk rejection
due to the voltage divider action of the switch OFF
impedance and the load impedance.
FIGURE 8. INPUT OVERVOLTAGE PROTECTION
V-
V
COM
V
NO
OPTIONAL PROTECTION
DIODE
V+
LOGIC
OPTIONAL PROTECTION
DIODE
OPTIONAL
PROTECTION
RESISTOR
FOR LOGIC
INPUTS
1k
ISL43840
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL43840IR-T | 功能描述:IC MUX/DEMUX DUAL 4X1 20QFN RoHS:否 类别:集成电路 (IC) >> 接口 - 模拟开关，多路复用器，多路分解器 系列:- 标准包装:48 系列:- 功能:开关 电路:4 x SPST - NO 导通状态电阻:100 欧姆 电压电源:单/双电源 电压 - 电源，单路/双路(±):2 V ~ 12 V，±2 V ~ 6 V 电流 - 电源:50nA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:管件 |
| ISL43840IRZ | 功能描述:多路器开关 IC SWITCH DL 4:1 MUX ENABLE +/-5V 60OHM RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| ISL43840IRZ-T | 功能描述:IC MUX/DEMUX DUAL 4X1 20QFN RoHS:是 类别:集成电路 (IC) >> 接口 - 模拟开关，多路复用器，多路分解器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:36 系列:- 功能:多路复用器 电路:2 x 4:1 导通状态电阻:75 欧姆 电压电源:单/双电源 电压 - 电源，单路/双路(±):2 V ~ 12 V，±2 V ~ 6 V 电流 - 电源:- 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:20-SOIC（0.295"，7.50mm 宽） 供应商设备封装:20-SOIC W 包装:管件 |
| ISL43841 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Low-Voltage, Single and Dual Supply, Dual 4 to 1 Multiplexer Analog Switch with Latch |
| ISL43841_04 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Low-Voltage, Single and Dual Supply, Dual 4 to 1 Multiplexer Analog Switch with Latch |
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