If you use a mux to select which /CS (chip select) is active, then you can use the same SCLK and DIN signals to multiple MAX5494 units on the same SPI bus. Simply enable the /CS signal on the particular MAX5494 with which you wish to communicate.
MAX5494
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The MAX5494–MAX5499 10-bit (1024-tap), dual, nonvolatile, linear-taper, programmable voltage-dividers and variable resistors perform the function of...
Datasheet
MAX5494 on Analog.com