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Fastino

Fast 32-channel, 3MS/s per channel, 16bit DAC EEM card with an output interface that is compatible with Zotino.

Design files (schematics, PCB layouts, BOMs) can be found at Fastino/Releases.

Specs

• 32 channels, 3 M/s simultaneous, 16 bit, +-10 V DAC
  • AD5542ABCPZ 1us settling time, >2.7 V
• LEDs
• Tempco <7ppm (2ppm reference, 0.1ppm DAC, 5ppm output amp divider)

Gateware

• Development and binaries at QUARTIQ/fastino
• 2.55 MS/s updates on all channels without contention
• Dynamically configurable fourth order CIC (cubic B-spline) interpolator per channel (interpolation rates from 1 to 65536)
• Ability to silence selected DAC updates and data transfers to suppress digital-to-analog feedthrough

Noise

Noise performance has been explored in #51.

Spurs

When suitably configured, Fastino has "spur-free" output signals in the 100 kHz to 5 MHz frequency range. Spur characterisation mesurements with and without DAC updates can be found in the issue discussions.

• Suitable configurations for low spur performance are explored in #56. Though measured with Fastino v1.0, the measured spur characteristics are still applicable. The measurements also demonstrate how to reduce all spurs in the 100 kHz to 5 MHz range (no digital updates).
• Digital updates cause measurable spurs in the Fastino analogue outputs. Fastino revisions v1.1 and v1.2 reduce the this digital to analogue crosstalk. Some measurements for Fastino revisions v1.0, v1.1 and v1.2 are found in #62, #75 and #85 respectively.

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