MAX4545EWP+

Analog Switches - Special Purpose Overview

The MAX4545EWP+ is a quad, low-voltage, bidirectional RF/video switch designed for 50Ω and 75Ω systems. It contains four normally open single-pole/single-throw (SPST) switches with a T-switch configuration. The device operates on dual supplies from ±2.7V to ±6V or a single supply from +2.7V to +12V. Key electrical parameters include a maximum on-resistance of 20Ω at ±5V, signal-path matching of 1Ω max, and flatness of 0.5Ω max. It provides -80dB off isolation and crosstalk at 10MHz, with a -3dB bandwidth of 300MHz. Logic inputs are TTL/CMOS compatible.

Analog Switches - Special Purpose Feature Summary

• T-switch construction ensures high-frequency off isolation and low crosstalk
• Rail-to-rail analog signal handling capability in either direction
• Low insertion loss suitable for RF and video applications
• TTL and CMOS logic compatibility across standard supply voltages

Analog Switches - Special Purpose Applications

• RF switching
• Video signal routing
• High-speed data acquisition
• Test equipment
• ATE equipment

Analog Switches - Special Purpose Procurement Notes

Verify the specific suffix 'EWP+' against the manufacturer's current ordering guide to confirm package type and temperature range. Ensure the component meets RoHS compliance requirements if applicable to your design. Cross-reference the datasheet revision date to confirm all electrical characteristics match your system specifications before finalizing procurement.

Analog Switches - Special Purpose Selection Notes

Select this component when designing circuits requiring bidirectional switching of RF or video signals up to 300MHz. It is optimal for 50Ω and 75Ω systems where low insertion loss and high isolation are critical. Consider the ±5V optimized performance for best linearity and speed, though it supports wider voltage ranges.

Analog Switches - Special Purpose Part Context

The MAX4545EWP+ belongs to the MAX4545/MAX4546/MAX4547 family of low-voltage analog switches. While the MAX4546 offers dual SPST configurations and the MAX4547 provides two SPDT switches, the MAX4545 specifically integrates four independent SPST switches. This family utilizes CMOS technology to achieve high bandwidth and low power consumption.

Analog Switches - Special Purpose Replacement Considerations

Direct functional substitutes within the same family include the MAX4546 and MAX4547, provided the channel count and configuration (SPST vs SPDT) align with the circuit design. Verify pinout compatibility and electrical parameter margins when substituting.

Analog Switches - Special Purpose FAQ

How does the T-switch configuration benefit high-frequency performance?

The T-switch construction uses N-channel and P-channel MOSFETs driven out of phase, which helps distribute capacitance evenly along the series resistance. This acts as a transmission line rather than a simple RC filter, enabling excellent 300MHz bandwidth.

What is the impact of using a single supply instead of dual supplies?

Single-supply operation limits AC signals to -0.3V due to internal ESD diodes. It also degrades switching speed, increases on-resistance, reduces off-isolation, and increases distortion compared to the optimized ±5V dual-supply operation.

Why are separate GND pins provided for each switch?

Separate GND pins are not internally connected to improve high-frequency performance by reducing ground loops and providing flexibility. They allow individual switches to be referenced to different potentials if necessary, though they should typically be connected to a solid ground plane.