General Description
The MAX4539/MAX4540 low-voltage, CMOS 8-channel (MAX4539) and dual 4-channel (MAX4540) multiplexers are ideal for precision ADC calibration and system selfmonitoring 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.

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

Applications
  Battery-Operated Equipment
  Avionics
  Data-Acquisition Systems
  Audio-Signal Routing
  Test Equipment Networking