Analog Devices Inc. ADG5248F/ADG5249F 用户定义故障保护 & 和检测多路复用器
亚德诺半导体 ADG5248F 和 ADG5249F 分别为用户定义故障保护& 检测 8:1 和双通道 4:1 模拟 多路复用器。ADG5248F 将 8 个输入之一切换至公共 输出，ADG5249F 将 4 个差分输入之一切换至 公共差分输出。两个器件上的 EN 引脚可用于启用 或禁用器件。接通时，各通道在两个方向的导电性能同样出色 ，每一通道的输入信号范围 可扩展至电源电压范围。 主电源电压决定 导通电阻曲线，副电源电压决定 启动过压保护的电压电平。没有电源时， 通道保持关断状态，开关输入高阻态 处于高阻抗。在正常工作条件下，如果 任何一个 Sx 引脚上的模拟输入信号电平 超过正故障电压（POSFV） 或负故障电压（NEGFV）达一个电压阈值 （V，T)， ），则相应的通道关断，并且该 Sx 引脚变为高阻态。如果 开关导通， 则漏极引脚拉至被超越的副电源电压。 在通电和无电状态下，对地高达 +55V 或 −55V 的 输入信号电平会被屏蔽。 ADG5248F 和 ADG5249F 开关具有超低电容和电荷注入特性 ，因而是要求低毛刺和快速建立时间的数据采集与采样保持应用的理想解决方案。
The primary supply voltages define the on-resistance profile, whereas the secondary supply voltages define the voltage level at which the overvoltage protection engages. When power supplies are absent, the channel remains in the off condition, and the switch inputs are high impedance. Under normal operating conditions, if the analog input signal levels on any Sx pin exceed positive fault voltage (POSFV) or negative fault voltage (NEGFV) by a threshold voltage (VT), the channel turns off and that Sx pin becomes high impedance. If the switch is on, the drain pin is pulled to the secondary supply voltage that was exceeded. Input signal levels up to +55V or −55V relative to the ground are blocked, in both the powered and unpowered condition.
The low capacitance and charge injection of the ADG5248F and ADG5249F switches make them well-suited for data acquisition and sample-and-hold applications, where low glitches and fast settling are required.
特性
- User-defined secondary supplies set overvoltage level
- Overvoltage protection up to −55V and +55V
- Power-off protection up to −55V and +55V
- Overvoltage detection on source pins
- Minimum secondary supply level: 4.5V single-supply
- Interrupt flags indicate fault status
- Low charge injection (QINJ): 0.8pC
- Low drain/source on capacitance
- ADG5248F: 19pF
- ADG5249F: 14pF
- Latch-up immune under any circumstance
- Known state without digital inputs present
- VSS to VDD analog signal range
- ±5V to ±22V dual supply operation
- 8V to 44V single-supply operation
- Fully specified at ±15V, ±20V, +12V, and +36V
应用
- Analog input/output modules
- Process control/distributed control systems
- Data acquisition
- Instrumentation
- Avionics
- Automatic test equipment
- Communication systems
- Relay replacement