Analog Devices Inc. ADG5248F/ADG5249F Fault Protection Multiplexers
Analog Devices ADG5248F and ADG5249F are user-defined fault protection & detection 8:1 and dual 4:1 analog multiplexers (respectively). The ADG5248F switches one of eight inputs to a common output, and the ADG5249F switches one of four differential inputs to a common differential output. An EN input on both devices enables or disables the device. Each channel conducts equally well in both directions when on and has an input signal range that extends to the supplies.
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.
Features
- 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
Applications
- Analog input/output modules
- Process control/distributed control systems
- Data acquisition
- Instrumentation
- Avionics
- Automatic test equipment
- Communication systems
- Relay replacement
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