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MAX1258 Production
The MAX1220/MAX1257/MAX1258 is a highly integrated system monitoring and control solution which includes a 16-channel (MAX1257/MAX1258) or 8-ch (MAX1220...
Datasheet
MAX1258 on Analog.com

Table of Contents

Why can't I get an analog output from the MAX1258?

This could be caused by a few things, but the most common is not interfacing with the MAX1258's SPI interface correctly. The MAX1258 does things differently on its SPI bus if you're talking to the ADC or DAC:  for ADC you need to use a CPOL =1, CPHA= 1 SPI configuration. For the DAC commands, use CPOL=0, CPHA=1 configuration.
Tags: precision adcs Multiplexed A/D Converters 000094075 MAX1258 Precision A/D Converters