The scenario
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.
What is in this drawing
Read the decisions behind it.
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.
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