User Defined Fault Protection and Detection, 10 Ω R, Quad Channel Protector

The ADG5462F contains four channels that are overvoltage protected. The channel protector is placed in series with the signal path and protects sensitive components from overvoltage faults in that path. The channel protector prevents overvoltages when powered and unpowered, and it is ideal for use in applications where correct power supply sequencing cannot always be guaranteed. The primary supply voltages define the on-resistance profile, while the secondary supply voltages define the voltage level at which the overvoltage protection engages.

When no power supplies are present, the channel remains in the off condition, and the channel 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 DR pin is driven low, the drain pin (Dx) is pulled to the secondary supply voltage that was exceeded. The output profile for each DR voltage level is shown in Figure 1. Input signal levels up to −55 V or +55 V relative to ground are blocked in both the powered and unpowered conditions.

The low on-resistance of these switches, combined with the on-resistance flatness over a significant portion of the signal range make them an ideal solution for data acquisition and instrumentation applications where excellent linearity and low distortion are critical.

Product Highlights

* Source pins are protected against voltages greater than the secondary supply rails (POSFV and NEGFV), up to −55 V and +55 V.

* In an unpowered state, source pins (Sx) are protected against voltages from −55 V to +55 V.

* Overvoltage detection with digital output indicates operating state of channel.

* Trench isolation guards against latch-up.

* Optimized for low on-resistance and on-resistance flatness.

* The ADG5462F operates from a dual power supply range of ±5 V to ±22 V or a single power supply range of 8 V to 44 V.

Applications

* Analog input/output modules

* Process control/distributed control systems

* Data acquisition

* Instrumentation

* Avionics

* Automatic test equipment

* Communication systems

* User defined secondary supplies set overvoltage level

* Overvoltage protection up to −55 V and +55 V

* Power-off protection up to −55 V and +55 V

* Overvoltage detection on source pins

* Minimum secondary supply level: 4.5 V single-supply

* Interrupt flag indicates fault status

* Low on resistance: 10 Ω typical

* On-resistance flatness: 0.5 Ω maximum

* 4 kV human body model (HBM) ESD rating

* Latch-up immune under any circumstance

* VSS to VDD analog signal range

* ±5 V to ±22 V dual supply operation

* 8 V to 44 V single-supply operation

* Fully specified at ±15 V, ±20 V, +12 V, and +36 V