MAX4540CWP

Analog Switches - Special Purpose Overview

The MAX4540CWP is a low-voltage, CMOS dual 4-to-1 cal-multiplexer designed for precision ADC calibration and system self-monitoring. It integrates on-chip resistor-dividers to generate accurate voltage ratios from an external reference, including 15/4096 and 4081/4096 ratios accurate to 15 bits, and 1/2V+ and 5/8(V+ - V-) ratios accurate to 8 bits. The device operates from a single +2.7V to +12V supply or dual supplies of ±2.7V to ±6V. Key electrical parameters include a maximum on-resistance (RON) of 100Ω with matching between channels limited to 6Ω max, off leakage current of 0.1nA at +25°C, and charge injection of 5pC max. It features enable inputs, address latching, and TTL/CMOS logic compatibility.

Analog Switches - Special Purpose Feature Summary

• On-chip gain and offset divider networks provide 15-bit accurate output ratios for precision calibration.
• Integrated V+ to GND and V+ to V- divider networks deliver 8-bit accurate output ratios for self-monitoring.
• Low on-resistance of 100Ω max with tight channel matching of 6Ω max ensures signal integrity.
• Ultra-low off leakage current of 0.1nA minimizes measurement errors in high-impedance applications.

Analog Switches - Special Purpose Applications

• Precision ADC calibration
• System self-monitoring
• Data-acquisition systems
• Test equipment

Analog Switches - Special Purpose Procurement Notes

Verify the component marking against the datasheet pinout and ordering information. Confirm the suffix 'C' indicates the commercial temperature range (0°C to +70°C) and 'WP' denotes the 20-pin Wide SO package. Ensure the source document matches the Maxim Integrated part number exactly to avoid counterfeit or mislabeled inventory.

Analog Switches - Special Purpose Selection Notes

Select the MAX4540CWP when a dual 4-channel multiplexer with integrated calibration dividers is required. Choose this over the MAX4539 if only two independent 4-to-1 switches are needed rather than a single 8-to-1 switch. Verify that the application requires the specific 15-bit and 8-bit internal divider ratios provided by this cal-mux architecture.

Analog Switches - Special Purpose Part Context

The MAX4540 is part of the MAX4539/MAX4540 family of low-voltage, single-supply cal-multiplexers. While the MAX4539 provides a single 8-to-1 configuration, the MAX4540 offers two independent 4-to-1 channels within the same 20-pin footprint. Both share identical internal divider structures and electrical characteristics, differing primarily in channel count and pin assignment for the analog outputs.

Analog Switches - Special Purpose Replacement Considerations

Public confirmed substitute part numbers: None identified in verified documentation.