±60 V Fault Protection and Detection,

Data Sheet

ADG5421F

Rev. 0

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FEATURES

Overvoltage fault protection up to ±60 V on S1 and S2 pins

Power-off protection up to ±60 V on S1 and S2 pins

Known state without digital inputs present

Low on resistance of 11 Ω typical

Ultraflat, on resistance

Latch-up immune under any circumstance

3.5 kV human body model (HBM) ESD rating

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

±5 V to ±22 V dual-supply operation

8 V to 44 V single-supply operation

10-lead, 3 mm × 2 mm, LFCSP

APPLICATIONS

Analog input and output modules

Process control and distributed control systems

Data acquisition

Instrumentation

Avionics

Automatic test equipment

Communication systems

Relay replacement

GENERAL DESCRIPTION

The ADG5421F is a dual SPST, low on resistance switch that

features overvoltage protection, power-off protection, and

overvoltage detection on the source pins.

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 either of the Sx pins

turn off together, and the open-drain fault flag (FF) pin pulls to a

logic low. Input signal levels up to +60 V or −60 V relative to

ground are blocked in both the powered and unpowered

condition.

The switches turn on with a Logic 1 input and conduct equally

well in both directions. The digital input is compatible with

1.8 V logic inputs over the full operating supply range.

FUNCTIONAL BLOCK DIAGRAM

D1

S1

IN1

ADG5421F

FF

D2

S2

FAULT

DETECTION

AND SWITCH

DRIVER

IN2

Figure 1.

COMPANION PRODUCTS

Precision 24-Bit ADC: AD7768-1

Precision 16-Bit, 2 MSPS SAR ADC: AD4000

PRODUCT HIGHLIGHTS

1. Source pins are protected against voltages greater than the

supply rails, up to −60 V and +60 V in both powered and

unpowered state.

2. Overvoltage detection with digital output indicates

operating state of switches.

3. Trench isolation guards against latch-up.

4. The ADG5421F can operate from a dual supply of ±5 V up

to ±22 V or a single power supply of +8 V up to +44 V.

5. Negative channel metal oxide semiconductor (NMOS)