ADG5249F

RECOMMENDED FOR NEW DESIGNS

User Defined Fault Protection and Detection, 0.8 pC QINJ, Dual 4:1 Multiplexers

Data Sheet (Rev. B) Product Selection Table
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Overview

  • 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 flags indicate fault status
  • Low charge injection (QINJ): 0.8 pC
  • Low drain/source on capacitance: 19 pF
  • Latch-up immune under any circumstance
  • Known state without digital inputs present
  • VSS to VDD analog signal range
    • ±5 V to ±22 V dual-supply operation
    • 8V to 44 V single-supply operation
    • Fully specified at ±15 V, ±20 V, +12 V, and +36 V

The ADG5248F and ADG5249F are 8:1 and dual 4:1 analog multiplexers. 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. Each channel conducts equally well in both directions when on, and each channel 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 no power supplies are present, 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 selected to be on, then the drain pin is pulled to the secondary supply voltage that was exceeded. Input signal levels up to +55 V or −55 V relative to ground are blocked, in both the powered and unpowered condition.

The low capacitance and charge injection of these switches make them ideal solutions for data acquisition and sample-and-hold applications, where low glitch switching and fast settling times are required. 

Note that, throughout this data sheet, multifunction pins, such as A0/F2, are referred to either by the entire pin name or by a single function of the pin, for example, A0, when only that function is relevant. 

APPLICATIONS

  • Analog input/output modules
  • Process control/distributed control systems
  • Data acquisition
  • Instrumentation
  • Avionics
  • Automatic test equipment
  • Communication systems
  • Relay replacement
ADG5249F
User Defined Fault Protection and Detection, 0.8 pC QINJ, Dual 4:1 Multiplexers
ADG5249F Functional Block Diagram ADG5249F Pin Configuration ADG5249F Pin Configuration
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Documentation

Data Sheet 1

User Guide 1

Application Note 2

Technical Articles 1

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • ADG5249F

IBIS Model 1

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

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schematic 1
EVAL-ADG5249F

ADG5249F Evaluation Board

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Features and Benefits

  • Supply voltages
    Dual supply: ±5 V to ±22 V
    Single supply: 8 V to 44 V
  • Protected against overvoltage on source pins
    Signal voltages up to −55 V and +55 V
  • LEDs for visual overvoltage indication
  • Parallel interface compatible with 3 V logic
  • On-board LDO regulator for digital supply and control, if required

Product Details

The EVAL-ADG5249FEBZ, is the evaluation board for the ADG5249F, which features an overvoltage protected dual 4:1 Multiplexer. The ADG5249F has overvoltage detection and protection circuitry on the source pins and is protected against signals up to −55 V and +55 V in both the powered and unpowered states.

The ADG5249F is soldered to the center of the evaluation board, and wire screw terminals are provided to connect to each of the source and drain pins. Three screw terminals are used to power the device, with a fourth terminal used to provide a user defined digital logic supply voltage, if required. Alternatively, a low dropout (LDO) regulator is provided for 5 V digital logic supply and to supply the LEDs, which are mounted to provide visual indication of the fault status of the switch.


Full specifications on the ADG5249F are available in the product data sheet, which should be consulted in conjunction with this user guide when using the evaluation board.
EVAL-ADG5249F
ADG5249F Evaluation Board
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