Low-Voltage, Single 8 to 1 and Dual 4 to 1 Cal Multiplexers

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The MAX4539/MAX4540 low-voltage, CMOS 8-channel (MAX4539) and dual 4-channel (MAX4540) multiplexers are ideal for precision ADC calibration and system self-monitoring applications. These calibration multiplexers (cal-muxes) have precision resistor-dividers to generate accurate voltage ratios from an input reference voltage. The reference ratios include 15/4096 and 4081/4096 of the external reference voltage, accurate to 15 bits, and 1/2V+ and 5/8(V+ - V-), accurate to 8 bits. The external reference voltage as well as ground can also be switched to the output. The MAX4539/MAX4540 have enable inputs and address latching. All digital inputs have 0.8V and 2.4V logic thresholds, ensuring both TTL- and CMOS-logic compatibility when using a ±5V or a single +5V supply. Protection diodes at all inputs provide an ESD rating >2kV.

The MAX4539/MAX4540 operate from a single +2.7V to +12V supply, or from dual supplies of ±2.7V to ±6V. On-resistance (100Ω max) is matched between switches to 6Ω max. Each switch can handle rail-to-rail analog signals. The off leakage current is 0.1nA at TA = +25°C and 2nA at TA = +85°C.

The MAX4539/MAX4540 are available in small 20-pin DIP, SO, and SSOP packages.
MAX4539: Pin Configuration MAX4539: Pin Configuration Enlarge+

Key Features

  • On-Chip Gain and Offset Divider Networks Provide 15-Bit Accurate Output Ratios
  • On-Chip V+ to GND and V+ to V- Divider Networks Provide 8-Bit Accurate Output Ratios
  • RON: 100Ω max
  • RON Matching Between Channels: 6Ω max
  • Charge Injection: 5pC max
  • Low 0.1nA Off Leakage Current
  • Small 20-Pin SSOP/SO/DIP Packages


  • Audio-Signal Routing
  • Avionics
  • Battery-Powered Applications
  • Data Acquisition
  • Networking
  • Test Equipment

See parametric specs for Switches and Multiplexers (Mid and High Voltage) (299)

Part NumberFunctionsConfig.ChannelsVSUPPLY (Single)
VSUPPLY (Single)
minmaxminmaxmaxmaxmaxmaxSee Notes
MAX4540 Mux4-to-122.7122.761000.11151005263
$4.36 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

App Note 5299 Selecting the Right CMOS Analog Switch
Request Reliability Report for: MAX4540 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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