Analog Devices Inc. ADG5208F/ADG5209F 故障保护多路复用器
亚德诺半导体 ADG5208F 和 ADG5209F 是 8:1 和双通道 4:1 模拟 多路复用器，可提供高达 −55V 和 +55V 的过压保护ADG5208F 将 8 个输入之一切换到公共 输出，ADG5209F 将 4 个差分输入之一切换到 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 ，输入信号范围 可扩展至电源电压范围。在整个工作电压范围内， 数字输入与 3V 逻辑输入兼容。没有通电时， 开关保持关断状态， 开关输入处于高阻态，实现故障保护。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 VDD 或 VSS 达一个电压阈值 VT， 则开关断开，漏极引脚拉至 被超越的电源电压。在通电和无电状态下，ADG5208F 和 ADG5209F 屏蔽了 对地高达 +55V 或 −55V 的输入信号电平。 ADG5208F 和 ADG5209F 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 。
When power supplies are absent, the switch remains in the off condition and the switch inputs are in a high impedance state for fault protection. Under normal operating conditions, if the analog input signal levels on any Sx pin exceeds VDD or VSS by a threshold voltage, VT, the switch turns off and the drain pin is pulled to the supply voltage that was exceeded. ADG5208F and ADG5209F blocks input signal levels up to +55V or −55V relative to the ground in both the powered and unpowered conditions.
The low capacitance and charge injection of the ADG5208F and ADG5209F switches make them ideal solutions for data acquisition and sample-and-hold applications, where low glitches and fast settling are required.
特性
- Overvoltage protection up to −55V and +55V
- Power-off protection up to −55V and +55V
- Overvoltage detection on source pins
- Low charge injection (QINJ): −0.4pC
- Low on capacitance
- ADG5208F: 20pF
- ADG5209F: 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
发布日期: 2015-07-16
| 更新日期: 2025-01-28