Insert Jacks; Wordclock Jacks; Adat Input; Optical Output - Art DIGITAL MPA User Manual

ART Digital MPA™ Microphone Preamplifier

Insert Jacks

The insert jacks are used to process the audio passed on to the A/D converter. The Insert Jacks
are wired: Tip = Input, Ring = Output, Sleeve = Ground. The input impedance is 10K Ohm and the
output impedance is 1K Ohm. The minimum input signal required to drive the A/D to clip is +12dBu
(3V rms)

Wordclock Jacks

The DMPA offers Wordclock input on a BNC connectors. A 5V logic level signal is required
to drive the digital clock circuitry. Both BNC connectors are tied together allowing you to loop
wordclock through the DMPA saving cabling complexity.

ADAT Input

The ADAT input for the DMPA is a standard optical connector. This input is used when synching to
ADAT for timing purposes. It is also used as a data source for channels 3-8, as the channels NOT
transmitted by the DMPA are passed from this input to the Optical output (when the optical output
is set to ADAT mode).

Optical Output

The Optical output switch selects the data source for this jack. This feature allows the DMPA to
output to multiple units in different formats at the same time.
In S/PDIF mode, two-channel audio is present. The data is identical to the coax and cannon digital
output connectors.
In ADAT mode the DMPA transmits its' A/D data on the first two channels and passes information
from the ADAT input jack (CH3-8) on to the other channels.
Using the optical output in S/PDIF is recommended over the coax output, as it is the most robust
and reliable of all the digital outputs. When connecting to consumer gear, use a sample rate
selection in the S/PDIF range of the selector knob.

S/PDIF Output

The S/PDIF coax connector allows the DMPA to connect to a wide range of consumer and profes-
sional equipment. This output is .5V p-p (peak-to-peak) (when connected) isolated from ground,
and has a 75 Ohm impedance. The same data is sent to both this connector and the AES/EBU
output, but it is recommended that you not use both at the same time, as the AES/EBU output may
work, but there will be too great a loss in level to meet the S/PDIF spec. Choose a sample rate in
the S/PDIF range of the front panel selector when using this jack.

AES/EBU Output

The AES/EBU output of the DMPA is a 5V p-p signal with a 110 Ohm impedance. This cannon
connector is driven by the same drive circuitry and isolation transformer and as the S/PDIF output.
Choose a sample rate in the AES/EBU range of the front panel selector when using this jack. If
this is not done equipment that follows the DMPA may not recognize this data as valid.
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