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2.1.
ANALOG AUDIO CONNECTIONS
The 7720ADC-A4 has two 6 pin terminal blocks containing balanced analog audio input. The audio cables
can be secured into the removable portion of the terminal strips using a small screwdriver. The removable
part of the terminal strip is then inserted into the rear panel.
Caution should be exercised when connecting cable shield to the "shield ground" as
this input has only a limited tolerance for any arising ground loop currents.
When using 7720ADC-A4, the shield should be connected at one end of the cable,
only. Which end of the cable shield should be grounded, source or destination, is a
matter of local practice / preference.
!
connections, please refer to Rane Note 151 ("Grounding and Shielding Audio
Devices", http://www.rane.com/pdf/note151.pdf). For the purposes of interpreting this
very thorough application note, be advised that 7720ADC-A4 connector pin "shield
ground" is internally connected to "signal ground" (not "chassis ground").
Shield ground loops currents may arise, if the source equipment "shield ground"
potential is significantly different from 7720ADC-A4 local power ground and the shield
is grounded at both ends. The card can tolerate about 0.5A of any resulting ground
loop current. Exceeding this limit risks causing catastrophic failure of the card.
2.2.
AES AUDIO CONNECTIONS
The 7720ADC-A4 has two BNC connectors for outputting unbalanced AES signals compatible with the
SMPTE 276M standard.
AES IN 2 output will come from the Analog Audio 3 and 4 inputs.
2.3.
AES REFERENCE CONNECTIONS
REF IN
Composite video or DARS reference input. This input is high impedance and must be
terminated externally.
The AES IN 1 output will come from the Analog Audio 1 and 2 inputs and the
Revision 1.1
7720ADC-A4 Analog Audio to AES Converter
For an authoritative guide to cable shield
7700 MultiFrame Manual
7720ADC-A4-3
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