The heart of the amplifier is a LTC1650 16-bit DAC driven in unipolar mode with a precision 3.0V reference. The voltage output is fed to a pair of low-noise op amps (OPA452) in a differential configuration with a gain of 11. The amp should have a full-scale output of 66V.
The waveform data is sent to the DAC via an optoisolated SPI interface. The optoisolation, combined with the isolated supplies, should ensure that there are no ground loop issues, or excess noise pickup from the microcontroller board.
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