Analog DevicesADG5401FBCPZ-RL7Analog Switch Multiplexers

10Ω Ron SPST Switch with Overvoltage Fault Protection & Secondary Feedback Channel

The ADG5401F is a single-pole/single-throw (SPST) low on resistance switch that features overvoltage protection, power-off protection and overvoltage detection on the source pin. The ADG5401F also features a protected feedback channel for use with digital to analog converter or amplifier outputs.

When no power supplies are present, the switch remains in the off condition, and the switch inputs are high impedance. When powered, if the analog input signal levels on the S pin exceed Vdd or Vss by a threshold voltage, Vt the switch turns off, the normally high FF (fault flag) pin drops to a logic low and a high resistance path between D and DFB is switched in to prevent an open loop condition on an amplifier output. Input signal levels up to +60 V or −60 V relative to ground are blocked, in both the powered and unpowered condition. The selectable POC function allows the protected switch terminal, S, to be driven to GND, to prevent glitches on the output. The switch turns on with a logic 1 input and conducts equally well in both directions. The digital input is compatible with 1.8 V logic inputs over the full operating supply range.

Precision Analog Output Protection:

Protect Against Field Failures 
- Eliminate field failures of analog outputs due to over voltage stresses.

Reduce Fault Power Dissipation 
- Remove the requirement for system power supplies to withstand high fault currents.

Simplify Design of IEC ESD, EFT & Surge Protection 
- Reduce design irritations by using tested ADG5401F + discrete protection circuit

Features:

- ±60 V Overvoltage protection.
       - Power-on & power-off protection.
- Fault Detection
       - Fault Flag digital pin to indicate a fault.
- 1.8V Logic Compatible
- Low On Resistance
       - 10Ω On Resistance Switch channel 
       - 2kΩ Feedback channel
- Small Size
       - 3 mm x 2 mm LFCSP Package
- Integrated Open Loop prevention switch
       - High Resistance path between D and DFB switched in during fault to prevent open loop condition on amplifier output.
- User enabled Power on Condition (POC)
       - Output driven to 0V on power-up & when switch disabled - prevents glitch on output during power-up

IEC61000-4 ESD, EFT & Surge Protection:

Add Discrete Components to get level 4 IEC protection against ESD EFT & Surge

Significant System Level Advantages:

- Ease of Protection Design
- Faster time to market
- Higher protection circuit performance
- Reduced value of series resistance in signal path
- Ease of TVS Selection
- AC and DC overvoltage protection up to ±60 V

Open Loop Prevention Feature:

- Both switch channels open during Overvoltage Fault.
- Internal Open Loop Prevention Switch Keeps Feedback loop intact during overvoltage fault
- Stable Amplifier output

Power on Condition (POC) Feature:

- Internally connects source to GND when switch channel is open (30k Ω)
- POC is a digitally user selectable Feature
- Prevents source/output node from floating

Source connected to internal ground when signal switch is opened

Related Components:

EV-ADG5401FEBZ-U2