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| 型号： | ISL84582IVZ-T |
| 厂商： | Intersil |
| 文件页数： | 2/14页 |
| 文件大小： | 0K |
| 描述： | IC MUX/DEMUX DUAL 4X1 16TSSOP |
| 标准包装： | 2,500 |
| 功能： | 多路复用器/多路分解器 |
| 电路： | 2 x 4:1 |
| 导通状态电阻： | 60 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： | 1µA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
10
FN6213.3
May 6, 2009
Detailed Description
The ISL84582 multiplexer offers precise switching capability
from a bipolar ±2V to ±6V or a single 2V to 12V supply with
low ON-resistance (39
Ω) and high speed operation
(tON =38ns, tOFF = 19ns) with dual 5V supplies. The device
is especially well suited to portable battery-powered
equipment thanks to the low operating supply voltage (2V),
low power consumption (3W), low leakage currents (0.2nA).
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
Ω
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 rON 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 ISL84582 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 absolute maximum voltage, the ISL84582 15V
absolute maximum 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.
The ISL84582 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 beginning on page 5 and
“Typical Performance Curves” beginning on page 11 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 ISL84582 is TTL compatible
(0.8V and 2.4V) over a V+ supply range of 2.7V to 10V. At
12V the VIH 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 VOH 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
Ω systems, signal response is reasonably flat even past
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
Ω 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
VCOM
VNO OR NC
OPTIONAL PROTECTION
V+
LOGIC
DIODE
OPTIONAL PROTECTION
DIODE
OPTIONAL
PROTECTION
RESISTOR
FOR LOGIC
INPUTS
1k
Ω
V-
ISL84582
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相关代理商/技术参数 |
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| ISL84684 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Ultra Low ON-Resistance, Low Voltage, Single Supply, Dual SPDT Analog Switch |
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