Isolated ADC reduces power consumption. (electrically isolated micropower 12-bit analog-to-digital converter operates on single 5V supply) (EDN Design Ideas)

EDN, March, 1995 by Hoskins, Kevin

The electrically isolated micropower 12-bit data-acquisition system in Fig 1 is ideal for digitizing the output of a transducer that operates in a hostile environment. The 1:1 transformer and three digital isolators provide electrical isolation of 500V rms between the host system and the data-acquisition circuitry and sensor. The circuit operates on a single 5V supply and communicates to a host system by using just two serial lines.

[IC.sub.1]'s micropower switcher, operating in flyback mode, drives the primary of a 1:1 transformer that transfers power to the isolated circuitry. The circuit rectifies and filters the voltage on the transformer secondary and applies the result to [IC.sub.2], a fixed 5V micropower linear regulator. [Q.sub.1] generates the feedback...

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