0.6 kΩ Feedback Channel

Data Sheet

ADG5401F

Rev. 0

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FEATURES

Analog output protection and detection solution

Overvoltage protection up to ±60 V on S and SFB pins

Power off protection up to ±60 V on S and SFB pins

Integrated 0.6 kΩ secondary feedback channel

Known output under all conditions

User enabled, power-on condition pulls source to 0 V

Known state without digital inputs present

Optimized resistance for measurement channel and

feedback channel

Low on resistance of 6 Ω typical on signal channel

Ultraflat, on resistance on signal channel

Latch-up immune

3 mm × 2 mm LFCSP

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

APPLICATIONS

DAC output protection

Amplifier output protection

Analog output modules

Process control/distributed control systems

Data acquisition

Instrumentation

COMPANION PRODUCTS

Current/Voltage Output DAC: AD5423

Precision Amplifier: ADA4077-1

Rail-to-Rail Output, JFET Op Amp: ADA4625-1

FUNCTIONAL BLOCK DIAGRAM

S

POC

D

IN

ADG5401F

FF

SFB

DFB

Figure 1.

GENERAL DESCRIPTION

The ADG5401F main channel switch is a SPST, low on-resistance

switch that features overvoltage protection, power off protection,

and overvoltage detection on the source pins (S and SFB). The

ADG5401F also features a protected secondary feedback channel

for use with digital-to-analog converter (DAC) 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

off, the open-drain FF pin pulls to a logic low and a path between

the D and DFB pins is switched on to prevent an open-loop

condition on the 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 pin function allows

the protected switch terminal, S, to be connected to GND to

minimize 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.

PRODUCT HIGHLIGHTS

1. Source pin is protected against voltages greater than the

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

unpowered states.

2. Overvoltage detection with digital output indicates

operating state of switches.

3. Trench isolation guards against latch-up.

4. The ADG5401F can operate from a dual supply range of

±5 V to ±22 V or a single-supply range of +8 V to +44 V.

5. Negative channel metal oxide semiconductor (NMOS)

5 V signal range.