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The DAC-400A/12 card provides 12 stereo analog audio outputs for external audio signals that can be used for a small amount of audio routing. Each stream provides conversion from analog audio to AES or AES to analog audio, making this module perfect for switching mixed audio formats without requiring external conversion. When the audio submodule is present, the analog audio is switched as mono streams for added flexibility for embedding the signal into the video stream or sending it to MADI or AES outputs. Balanced connections are available. Optional balanced breakout panels are available to convert Sub-D connectors to a terminal block.

Technical Specs

The Digital Audio DAC Output Board with TDM (121326-1) receives 12 AES3 digital audio signals or receives a single TDM stream from the appropriate xpoint board. These signals are individually distributed to the digital to analog converter outputs and the monitor matrix module. The converted analog audio is then driven to the router output panels. The signal passed to the monitor matrix module will be the AES3 digital audio before it is converted into analog.

Circuit Description

The 12 digital audio signals arrive at the output card from corresponding xpoint boards as differential signals or they arrive from the TDM xpoint board as a single TDM stream. When a TDM stream is presented to the output board a deserializer separates the 12 signals and passes them to the FPGA for routing.

When there is no TDM stream present, the mode changes to Non-TDM and the 12 signals are passed directly to the FPGA for routing. The FPGA determines whether to route the TDM or Non-TDM signals to the output drivers; there, it is converted into two differential pairs of AES3 audio. One pair is passed to the monitor matrix circuit where one of the twelve outputs is routed to the monitor matrix output. The second pair is driven to the digital to analog converter circuit and then output to the rear panel.

Controls and Indicators


P1 Standard UT400 diagnostic port that provides detailed operational status and control for this card.



PWR OK > Power supply indicator (Green). Illuminated when the local power supplies are within tolerance.

COMMS > Communications indicator (Yellow). Illuminated when the Frame Controller Module addresses this card.

SIGDET (L/R) 1-12 > Signal detection LEDs (Green). Illuminated when a valid digital signal is detected on the associated output driver. (NOTE: (Non-TDM mode) The MADI and ADC inputs to this board provide a ‘no audio’ AES signal, which will illuminate the signal detect LEDs when switched to these outputs. In TDM mode, an audio signal level approximately < .1V will not illuminate a signal detect LED.)

1.2V, 1.8V, 3.3V, 5VA, 12V and -12V > Power supply fail indicators (Red). Illuminated when local voltages fall out of 10% tolerance


This board will drive high impedance loads (100k ohm – no jumper). In instances when a 600 ohm load needs to be driven, this board is supplied with jumpers on each channel that, when installed, provide the appropriate level adjustment.

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