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| 型号： | LT6555CGN#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/16页 |
| 文件大小： | 0K |
| 描述： | IC VIDEO MULTIPLEXER 2X1 24SSOP |
| 标准包装： | 55 |
| 功能： | 视频多路复用器 |
| 电路： | 3 x 2:1 |
| 电压电源： | 双电源 |
| 电压 - 电源，单路/双路(±)： | ±2.25 V ~ 6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 管件 |
| 产品目录页面： | 1321 (CN2011-ZH PDF) |
LT6555
8
6555f
Power Supplies
The LT6555 is optimized for
±5V supplies but can be
operated on as little as
±2.25V or a single 4.5V supply and
as much as
±6V or a single 12V supply. Internally, each
supply is independent to improve channel isolation. Do
not leave any supply pins disconnected or the part may
not function correctly!
Enable/Shutdown
The LT6555 has a shutdown mode controlled by the EN
pin and referenced to the DGND pin. If the amplifier will
be enabled at all times, the EN pin can be connected
directly to DGND. If the enable function is desired, either
driving the pin above 2V or allowing the internal 46k pull-
up resistor to pull the EN pin to the top rail will disable the
amplifier. When disabled, the DC output impedance will
rise to approximately 360
through the internal feedback
and gain resistors. Supply current into the amplifier in the
disabled state will be:
I
VV
k
VV
k
S
EN
=+
+
–
– –
46
80
It is important that the following constraints on the DGND,
EN and SEL pins are always followed:
V+ – VDGND ≥ 4.5V
VEN – VDGND ≤ 5.5V
VSEL – VDGND ≤ 8V
In dual supply cases where V+ is less than 4.5V, DGND
should be connected to a potential below ground, such as
V–. Since the EN and SEL pins are referenced to DGND,
they may need to be pulled below ground in those cases.
In single supply applications above 5.5V, an additional
resistor may be needed from the EN pin to DGND if the pin
is ever allowed to float. For example, on a 12V single
supply, a 33k resistor would protect the pin from floating
too high while still allowing the internal pull-up resistor to
disable the part.
On dual
±2.25V supplies, connecting the DGND pin to V–
is the only way of ensuring that V+ – VDGND ≥ 4.5V.
The DGND pin should not be pulled above the EN pin since
doing so will turn on an ESD protection diode. If the EN pin
voltage is forced a diode drop below the DGND pin, current
should be limited to 10mA or less.
The enable/disable times of the LT6555 are fast when
driven with a logic input. Turn on (from 50% EN input to
50% output) typically occurs in less than 50ns. Turn off is
slower, but is typically below 500ns.
Channel Select
The SEL pin uses the same internal threshold as the EN pin
and is also referenced to DGND. When the pin is logic low,
the channel A inputs are passed to the output. When the
pin is logic high, the channel B inputs are passed to the
output. The pin should not be floated but can be tied to
DGND to force the outputs to always be channel A or to V+
(when less than 8V) to force the outputs to always be
channel B.
Truth Table
SEL A/B
EN
OUT
00
2
× IN A
10
2
× IN B
X
1
OFF
Input Considerations
The LT6555 uses input clamps referenced to the VREF pin
to prevent damage to the input stage on the unselected
channel. Three transistors in series limit the input voltage
to within three diode drops (
±) from VREF. VREF is nomi-
nally set to half of the sum of the supplies by the 40k
resistors. A simplified schematic is shown in Figure 1.
To improve clamping, the pin’s DC impedance should be
minimized by connecting the VREF pin directly to ground in
the symmetric dual supply case with a common mode
voltage of 0V. While loaded output swing limits the useful
input voltage range in that case, if the common mode
voltage is not centered at ground or the input voltage
exceeds plus or minus three diodes from ground, an
external resistor to either supply can be added to shift the
APPLICATIO S I FOR ATIO
WU
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT6555CUF | 制造商:LINER 制造商全称:Linear Technology 功能描述:650MHz Gain of 2 Triple 2:1Video Multiplexer |
| LT6555CUF#PBF | 功能描述:IC VIDEO MULTIPLEXER 2X1 24QFN 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:- 其它有关文件:STG4159 View All Specifications 标准包装:5,000 系列:- 功能:开关 电路:1 x SPDT 导通状态电阻:300 毫欧 电压电源:双电源 电压 - 电源，单路/双路(±):±1.65 V ~ 4.8 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:7-WFBGA，FCBGA 供应商设备封装:7-覆晶 包装:带卷 (TR) |
| LT6555CUF#TRPBF | 功能描述:IC VIDEO MULTIPLEXER 2X1 24QFN 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:- 其它有关文件:STG4159 View All Specifications 标准包装:5,000 系列:- 功能:开关 电路:1 x SPDT 导通状态电阻:300 毫欧 电压电源:双电源 电压 - 电源，单路/双路(±):±1.65 V ~ 4.8 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:7-WFBGA，FCBGA 供应商设备封装:7-覆晶 包装:带卷 (TR) |
| LT6555IGN | 制造商:Linear Technology 功能描述:Video Multiplexer 24-Pin SSOP N |
| LT6555IGN#PBF | 功能描述:IC VIDEO MULTIPLEXER 2X1 24SSOP 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:- 其它有关文件:STG4159 View All Specifications 标准包装:5,000 系列:- 功能:开关 电路:1 x SPDT 导通状态电阻:300 毫欧 电压电源:双电源 电压 - 电源，单路/双路(±):±1.65 V ~ 4.8 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:7-WFBGA，FCBGA 供应商设备封装:7-覆晶 包装:带卷 (TR) |
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