DAR3000C01

AES/EBU digital audio reference signal generator

The DAR3000C01 module is a digital audio reference signal generator. It includes composite video reference inputs, digital audio reference inputs and word-clock references inputs and can synchronize to any of them. A temperature-compensated quartz crystal oscillator (TCXO) is provided to generate the reference signal when no external reference source is available.
The output signal uses the AES3 format and is provided on four outputs. In addition, there are two BNC outputs that provide the word-clock.
Synchronization to the video signal is performed as per AES11.
The reference signal delivered at the output is normally set to silence, but it can also be a tone with an amplitude of 0 dBfs, -18 dBfs or -20 dBfs. The tone frequency can be either 400 Hz or 1 kHz. In addition, periods of silence can be added to the tone signal in order to create dips for identification of the audio channels.
The module accepts reference signals of three different types: PAL or NTSC video signals (black burst), audio sampling frequency signals (word-clock) and AES/EBU digital audio signals as per AES11. If no signal is available at any of the inputs, the module outputs a signal with a user-selectable frequency of 32, 44.1, 48, 64, 88.2 or 96 kHz, synthesized by the TXCO oscillator whose long-term stability is Grade 1 (frequency error is less than 1 ppm).
The front panel of the module contains LEDs that indicate the reference input selected and the synchronization status at all times.