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參數(shù)資料
| 型號： | ISL54065EVAL1Z |
| 廠商： | Intersil |
| 文件頁數(shù)： | 15/15頁 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD FOR ISL54065 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 接口，2:1 多路復(fù)用器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ISL54065 |
| 主要屬性： | 2 x SPDT 模擬開關(guān) |
| 次要屬性： | 1.8 V ~ 6.5 V 電源 |
| 已供物品： | 板 |
9
FN6583.2
November 3, 2009
Detailed Description
The ISL54065 is a bidirectional, dual single pole-double
throw (SPDT) analog switch that offers precise switching
from a single 1.8V to 6.5V supply with low ON-resistance
(0.83
Ω) and high speed operation (t
ON =55ns, tOFF = 18ns).
The device is especially well suited for portable battery
powered equipment due to its low operating supply voltage
(1.8V), low power consumption (8nA), and a tiny 2.2x1.4mm
TQFN package. The low ON-resistance and RON flatness
provide very low insertion loss and signal distortion for
applications that require signal switching with minimal
interference by the switch.
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. The ISL54065
contains ESD protection diodes on each pin of the IC (see
Figure 9). These diodes connect to either a +Ring or -Ring
for ESD protection. To prevent forward biasing the ESD
diodes to the +Ring, V+ must be applied before any input
signals, and the input signal voltages must remain between
recommended operating range.
If these conditions cannot be guaranteed, then precautions
must be implemented to prohibit the current and voltage at
the logic pin and signal pins from exceeding the maximum
ratings of the switch. The following two methods can be used
to provided additional protection to limit the current in the
event that the voltage at a logic pin or switch terminal goes
above the V+ rail.
Logic inputs can be protected by adding a 1k
Ω resistor in
series with the logic input (see Figure 9). The resistor limits
the input current below the threshold that produces
permanent damage.
This method is not acceptable for the signal path inputs.
Adding a series resistor to the switch input defeats the
purpose of using a low rON switch. Connecting external
Schottky diodes to the signal pins will shunt the fault current
to the V+ supply instead of through the internal ESD diodes
thereby protecting the switch. These Schottky diodes must
be sized to handle the expected fault current.
Power-Supply and By-Pass Considerations
The ISL54065 construction is typical of most single supply
CMOS analog switches, in that they have two supply pins:
V+ and GND. V+ and GND drive the internal CMOS
switches and set their analog voltage limits. Unlike switches
with a 5.5V maximum supply voltage, the ISL54065’s 6.5V
maximum supply voltage provides plenty of head room for
the 10% tolerance of 5V supplies due to overshoot and noise
spikes.
The minimum recommended supply voltage is 1.8V. It is
important to note that the input signal range, switching times,
and ON-resistance degrade at lower supply voltages. Refer
to “Electrical Specifications” tables, beginning on page 3,
and “Typical Performance Curves”, beginning on page 11,
for details.
V+ and GND also power the internal logic and level shifters.
The level shifters convert the input logic levels to V+ and
GND signals levels to drive the analog switch gate terminals.
A high frequency decoupling capacitor placed as close to the
V+ and GND pin as possible is recommended for proper
operation of the switch. A value of 0.1F is highly
recommended.
Negative Signal Swing Capability
The ISL54065 contains circuitry that allows the analog
switch signal to swing below ground. The device has an
analog signal range of 6.5V below V+ up to the V+ rail (see
example, if V+ = 5V, then the analog input signal range is
from -1.5V to +5V. If V+ = 2.7V then the range is from -3.8V
to +2.7V.
Click and Pop Operation
The ISL54065 contains circuitry that prevents audible click
and pop noises that may occur when audio sources are
powered on or off. Single supply audio sources are biased at
a DC offset that can generate transients during power on/off.
A DC blocking capacitor is needed to remove the DC bias at
the speaker load. For 32
Ω headphones, a 220F capacitor is
typically used to preserve the audio bandwidth. The power
GND
VCOMx
VNCx
V+
LOGIC
INPUTS
VNOx
-RING
+RING
CLAMP
1k
Ω
FIGURE 9. OVERVOLTAGE PROTECTION
ISL54065
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL54065IRUZ | 制造商:Intersil 功能描述:Negative Signal Swing, Sub-ohm, Dual SPDT with Click and Pop Elimination Single Supply Switch with Enable Pin |
| ISL54065IRUZ-T | 功能描述:IC SWITCH DUAL SPDT 12UTQFN RoHS:是 類別:集成電路 (IC) >> 接口 - 模擬開關(guān)，多路復(fù)用器，多路分解器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:36 系列:- 功能:多路復(fù)用器 電路:2 x 4:1 導(dǎo)通狀態(tài)電阻:75 歐姆 電壓電源:單/雙電源 電壓 - 電源，單路/雙路(±):2 V ~ 12 V，±2 V ~ 6 V 電流 - 電源:- 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:20-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:20-SOIC W 包裝:管件 |
| ISL54066 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Negative Signal Swing, High Off-Isolation, Dual SPST Single Supply Switch |
| ISL54066_0911 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Negative Signal Swing, High Off-Isolation, Dual SPST Single Supply Switch |
| ISL54066IRTZ | 功能描述:IC SWITCH SPDT DUAL 10TQFN RoHS:是 類別:集成電路 (IC) >> 接口 - 模擬開關(guān)，多路復(fù)用器，多路分解器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:36 系列:- 功能:多路復(fù)用器 電路:2 x 4:1 導(dǎo)通狀態(tài)電阻:75 歐姆 電壓電源:單/雙電源 電壓 - 電源，單路/雙路(±):2 V ~ 12 V，±2 V ~ 6 V 電流 - 電源:- 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:20-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:20-SOIC W 包裝:管件 |
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