CXAS4243是一款低功耗、双端口、高速、USB2.0（480Mbps）双刀双掷模拟开关，具有导通电阻在VCC=3V时为4.5欧姆，典型的低通电容为3.7pf。CXAS4243兼容USB2.0的要求和所需的宽带通过三次谐波，使信号具有最小的边缘和相位失真。优越的信道间串扰也将干扰降至最低。两个部分的“先断后合”功能可消除切换期间的信号中断，从而防止两个开关同时启用。CXAS4243在开关I/O引脚上包含特殊电路，用于VCC电源断电（VCC=0）的应用，使设备能够承受过电压状态。该装置的设计目的是，即使施加在Sel引脚上的控制电压低于电源电压（VCC），也能将电流消耗降至最低。此功能对于超便携应用程序（如手机）特别有用，允许与通用I/O直接接口基带处理器的。其他应用包括便携式手机、掌上电脑、数码相机、打印机和笔记本电脑中的交换和连接器共享
宽电源范围：2.3V至5V
低通电容3.7pf典型
当VSW=0.4V时，3V VDD下的低通电阻为4.5Ω（典型值）
高带宽（-3db）：>720MHz（不含CL）和>550MHz（含CL=5pF）
低功耗：最大1uA
ESD：通过8kV HBM试验
所有USB端口上的过电压容限（OVT）高达5.25V，无外部组件
合前断开开关
[ CXAS4243 ]
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目录
1.产品概述 2.产品特点 3.应用范围 4.技术规格书下载（PDF文档）
一.产品概述
The CXAS4243 is a Low-Power, Two-Port, High-Speed, USB2.0 (480Mbps) double –pole double-throw (DPDT) Analog Switch featuring an On-Resistance of 4.5 ohm at VCC=3V and a Low On Capacitance 3.7pf Typical. The CXAS4243 is compatible with the requirements of USB2.0 and the wide bandwidth needed to pass the third harmonic, resulting in signals with minimum edge and phase distortion. Superior channel-to channel crosstalk also minimizes interference. Break-before-make function for both parts eliminates signal disruption during switching from preventing both switches being enabled simultaneously.
The CXAS4243 contains special circuitry on the switch I/O pins for applications where the VCC supply is powered-off (VCC=0), which allows the device to withstand an over-voltage condition. This device is designed to minimize current consumption even when the control voltage applied to the Sel pin is lower than the supply voltage (VCC). This feature is especially valuable to ultra-portable applications, such as cell phones, allowing for direct interface with the general purpose I/Os of the baseband processor. Other applications include switching and connector sharing in portable cell phones, PDAs, digital cameras, printers, and notebook computers
二.产品特点
Wide Power Supply Range: 2.3V to 5V
Low On Capacitance 3.7pf Typical
Low On Resistance 4.5Ω (typ) at 3V VDD when VSW=0.4V
High Bandwidth (-3db): >720MHz without CL and >550MHz with CL=5pF
Low Power Consumption: 1uA Maximum
ESD: pass 8kV HBM test
Over voltage tolerance (OVT) on all USB ports up to 5.25V without external components
TTL/CMOS Compatible
Break-Before-Make Switching
Operation Temperature Range: -40℃ to 85℃
UTQFN1.8×1.4-10L and MSOP10L Package
三.应用范围
Cell phone,
PDAs,
Digital camera,
Notebook,
LCD Monitor,
TV,
SET-TOP
BOX
四.技术规格书（产品PDF)
需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持！
五.产品封装图
六.电路原理图
七.相关芯片选择指南
| 模拟开关(Analog Switch) | |||||
| Part No. | Mode | Features | VDD | Package | Applications |
| CXAS4239 | SPDT | 2.7Ω 300MHz Low-Voltage Analog Switch | 1.8~5.5V | SC70-6 | Mobile Phone, PDA |
| CXAS4240C | Dual SPDT | 0.4Ω 27MHz Analog Switch | 1.65~5.5V | CSP10 | Mobile Phone, PDA |
| CXAS4241 | 4 SPDT | 0.4Ω 42MHz Analog Switch | 1.6~4.2V | TQFN16 | Mobile Phone, PDA |
| CXAS4242 | DPDT | High Speed USB 2.0(480Mbps) | 2.3~5 V | UTQFN10 | Mobile phone, DC and Notebook |
| CXAS4243 | DPDT | High Speed USB 2.0(480Mbps) | 2.3~5V | UTQFN10 MSOP10 | Mobile phone, DC and Notebook |
| CXAS4244 | 4 SPDT | 5.0Ω 500MHz Analog Switch | 4~5.5V | SOP16 SSOP16 | LCD TV, STB, DVD |
| CXAS4245 | 4 SPDT | Quad SPDT Analog Switch | 4~5.5V | SOP16 SSOP16 | LCD TV, STB, DVD |
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