Specifications

Prism Media Products Limited AD-2 Dual-rate A/D converter
Operation Manual
Issue 0.2 © Prism Media Products Limited
11 August 1998 Page 48 of 58
Note: J17 emphasis cannot be indicated on the SDIF-2 outputs.
7.5.7. Coaxial SDIF-2 (Sony) wordclock format
This output carries a TTL level square wave at the sample rate. The rising edge
coincides with the start of a sample frame on the digital outputs. The wordclock rate
matches the sampling rate of whichever of Main or Aux output paths is assigned to the
BNC1 output, unless the BNCs are set to ‘Split96' format in which case the wordclock
rate is set to the Split96 frame rate, i.e. half the sampling rate.
Electrically, the wordclock output is identical to the SDIF-2 L and R outputs.
This output is used to synchronize equipment that is using the SDIF-2 data outputs, or
any other equipment which can accept a wordclock reference sync.
7.5.8. BNC DSD output data
When the BNC outputs are set to DSD mode they transmit heavily oversampled pulse
density modulated output signals, one channel per connector. The data is TTL-level as
described in the section above.
7.5.9. Coaxial DSD output clock
When the BNC outputs are set to DSD mode, the normal coaxial wordclock output
format changes to a DSD bit-clock. Data outputs change the falling edge of the output
clock, and may be clocked into a receiving device on the rising edge.
Note: DSD operation of the BNC outputs requires an upgrade option.
7.5.10. Validity bit on AES3 and IEC958 format digital outputs
In A-D mode the validity bit is transmitted as zero which indicates that the audio data is
suitable for conversion to analogue using linear PCM decoding.
In D-D mode, if a reception error is detected then the validity flag on the AES3 or
IEC958 output is set, otherwise it is passed through from the input unless the selected
input is SDIF-2 format when it is set to zero.