Analog Devices (ADI) has introduced a quad-channel protector and two multiplexers offering ±55V overvoltage protection (OVP) for precision converters, amplifiers and other components that operate from a voltage of 4.5V up to 36V.
According to ADI the ADG5462F quad channel protector, ADG5248F 8:1 multiplexer and ADG5249F differential 4:1 multiplexer offer ±55V OVP in power-on and power-off stages and protect against hot-swapping and operator miss-use events, protecting downstream analogue components.
By providing on-chip fault diagnostics, the devices detect and avoid defective channels, which simplifies fault detection algorithms and improves system uptime, said the company.
The chips help users to define fault-trigger levels independent of primary supplies, and by removing the need for multiple discrete protection components, ADI claims they optimise PCB area and simplify the design process. The devices are optimised for precision instrumentation, process control and avionics applications.
The ADG5248F 8:1 multiplexer and ADG5249F differential 4:1 multiplexer maximise throughput for small signal measurement such as thermocouples or resistance temperature detectors (RTDs) by offering low-fault leakage of 70nA and on-leakage of 20nA. These levels ensure that the user can take accurate measurements when other multiplexer I/O channels are in an over-voltage fault condition.
- Over-voltage detection on source pins
- Minimum secondary supply level: 4.5V single-supply
- Over-voltage protection up to ±55 V
- 4kV HBM (human body model) ESD (ADG5462F)
- 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
- Operating Temperature Range −40°C to +125°C
For more detail: ADI launches quad-channel protector