ADG5249FBRUZ-RL7

Analog Switches, Multiplexers, Demultiplexers Overview

The ADG5249FBRUZ-RL7 is a dual 4:1 analog multiplexer manufactured by Analog Devices Inc. It switches one of four differential inputs to a common differential output, featuring user-defined overvoltage protection up to ±55 V via secondary supplies. The device operates on single supplies from 8 V to 44 V or dual supplies from ±5 V to ±22 V. Key electrical parameters include a typical on-resistance of 250 Ω at ±15 V, charge injection of 0.8 pC, and a -3 dB bandwidth of 320 MHz. It provides latch-up immunity, low drain/source capacitance (14 pF), and interrupt flags for fault detection.

Analog Switches, Multiplexers, Demultiplexers Feature Summary

• User-defined secondary supplies set the overvoltage protection level, blocking signals up to ±55 V in both powered and unpowered states.
• Interrupt flags indicate fault status when analog input signals exceed defined positive or negative fault voltage thresholds.
• Low charge injection and low drain/source capacitance make the switch suitable for sample-and-hold applications requiring fast settling times.
• Latch-up immune under any circumstance with known state without digital inputs present.

Analog Switches, Multiplexers, Demultiplexers Applications

• Analog input/output modules
• Process control/distributed control systems
• Data acquisition
• Instrumentation
• Avionics

Analog Switches, Multiplexers, Demultiplexers Procurement Notes

Verify the component against the official Analog Devices datasheet Rev. B specifications. Confirm that the ordering suffix RL7 corresponds to the reel packaging format. Ensure the secondary supply connections are correctly configured to define the desired overvoltage protection levels before deployment.

Analog Switches, Multiplexers, Demultiplexers Selection Notes

Select the ADG5249FBRUZ-RL7 for applications requiring differential signal routing with high-voltage fault protection. Compare the 14 pF source capacitance against the ADG5248F's 19 pF if lower capacitance is critical. Verify that the required analog signal range fits within the VSS to VDD limits and that the power supply sequencing protects the device during startup.

Analog Switches, Multiplexers, Demultiplexers Part Context

This part belongs to the ADG5248F/ADG5249F family of multiplexers designed for robust industrial environments. While the ADG5248F handles eight single-ended channels, the ADG5249F manages four differential pairs. Both share identical overvoltage protection mechanisms and pinout architectures, differing primarily in channel configuration and specific capacitance values.

Analog Switches, Multiplexers, Demultiplexers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should verify compatibility with existing circuit layouts and ensure that any replacement maintains the same overvoltage protection thresholds and package dimensions.

Analog Switches, Multiplexers, Demultiplexers FAQ

How is the overvoltage protection level determined?

The overvoltage protection level is determined by the voltage applied to the POSFV and NEGFV pins. These secondary supplies define the threshold at which the switch turns off and blocks the input signal.

What happens to the switch when no power supplies are present?

When no power supplies are present, the channel remains in the off condition, and the switch inputs become high impedance, maintaining protection against voltages up to ±55 V.

How does the device indicate a fault condition?

The device uses two digital outputs: the FF (Fault Flag) pin goes low when any Sx input exceeds the fault threshold, and the SF (Specific Fault) pin indicates which specific input caused the fault based on the state of the F0, F1, and F2 decoder pins.