Singmai Electronics SM06, Руководство пользователя, Страница: 13 / 26

SingMai Electronics
SM06 User Manual Revision 0.4 Page 13 of 26
Sheet 9.
U8 is a 10 bit digital to analogue converter (DAC). The DAC converts the aCVi encoded digital data
to an analogue signal of 0 - 1.0V amplitude. The DAC is clocked at 148.5MHz. U6 provides a ‘clean’
3.3V for the DAC. U21 amplifies the DAC output to provide a 1.8V pk-pk output for driving the
outputs and U9 provides a programmable low pass filter to remove the clock from output video
and reconstitute the waveform.
Sheet 10.
U10-A buffers the coaxial aCVi video while U23 converts the differential aCVi to a single ended
output. J9 selects the input from either the coaxial connector (connect J9 pins 1-2) or the UTP
connector (connect J9 pins 2-3). U10-B filters the input signal and C50 and D3 form a sync tip clamp
to ensure stable DC levels into the data slicer. The data slicer is formed by comparator U10-D and
buffered by U11 before being decoded by the PT55 aCVi encoder IP core.