Datasheet

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In PLC
and DCS systems, analog output currents and voltages provide critical control and actuation
functions. The Alameda (MAXREFDES24#)
reference design shown in Figure 1 features four flexible and
programmable analog outputs that meet industrial control requirements.
The MAX5134
lies at the heart of the system. This four-channel, 16-bit, high-accuracy digital-to-analog
converter (DAC) provides voltage outputs that drive the inputs of four MAX15500 signal conditioners. These
signal conditioners produce user-programmable accurate current or voltage outputs. The MAX15500 also
provides extensive error reporting. The MAX6126
produces an ultra-high-precision voltage reference for the
DAC and the output conditioners. The MAX14850
galvanically isolates data communication from the field
side and the system controller
.
The Alameda also integrates an isolated, wide DC input range, flyback converter power supply. The peak
current-mode flyback controller, MAX17498B
, efficiently drives an isolated transformer and generates ±24V
and +8V outputs. The MAX1659
low-dropout (LDO) linear regulator then regulates the +8V output to a +5V
low-noise output. The entire system requires only a 24V input for power.
The subsystem features all typical bipolar current and voltage output ranges, and appropriate subsets, with
less than ±0.1% typical total unadjusted error (TUE
). The circuit also provides open-circuit detection,
brownout
detection, overtemperature protection, short-circuit and overcurrent protection, which are all critical
for industrial applications. Flexible power-up options make Alameda an ideal choice for robust industrial
control systems.