상황
Designing a galvanically isolated interface to convert a microcontroller's PWM signal into an analog voltage for industrial control systems, ensuring noise immunity and safe isolation.
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01
Use of 6N137 high-speed optocoupler for digital signal isolation
02
Second-order Sallen-Key active low-pass filter for smoothing PWM to DC
03
Selection of MCP6002 rail-to-rail op-amp for single-supply operation
When needing to transmit a PWM signal across an isolation barrier to generate an analog control voltage in noisy industrial environments.