Hardware/Mezzanine/audio AD-DA

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Audio AD/DA mezzanine board

This board has been developed as a low-cost replacement of the high-speed AD-DA board. It features:

  • two 24-bit, 192 kHz, stereo WM8782 ADCs
  • two 24-bit, 192 kHz, stereo WM8759 DACs

Power supply

The supply from the connector is used to power the TL064 op amps. They can be powered between ±3.5 V and ±18V.

A TPS54227 DC/DC converter generates 6.5 V from the power supply and is followed by a 5 V regulator.

Hence, the minimal power supply range is about ±7 V.

Input range

The board input signals are brougth to differential op-amp circuits with

  • R15 = R17 = R16 = R18 = R36 = R38 = R37 = R39
  • R8 / R17 = R10 / R15 = R12 / R18 = R14 / R16
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