PROPixx User Manual
Analog input interface
The PROPixx analog subsystem includes 16 ADC (Analog-to-Digital Converter) channels, with 16-bit precision and ±10 V
input range. The maximum sampling rate is 200 kSPS and all 16 channels are simultaneously sampled for evoked
potential and other applications sensitive to the sampling phase. The ADC sample rate can be specified in samples per
second, samples per video frame, or nanoseconds per sample. Sampling can be synchronized to video refresh with
microsecond precision.
Digital interface
The PROPixx contains 24 TTL inputs and 24 TTL outputs. Inputs are pulled up, so simple response boxes can be read
with no additional hardware. TTL input transitions are time-tagged to enable response time calculation with
microsecond precision. Similarly, TTL outputs can be scheduled to transition at a specified point within a video frame,
to enable simple triggering of external testing hardware.
Audio interface
The PROPixx contains a stereo audio CODEC which can bias and convert a stereo microphone input. The CODEC can also
drive a 96 kSPS audio stimulus directly into headphones. Stimulus phase between audio-left, audio-right, and video
refresh can be controlled with microsecond precision for cross-modal research.
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