Wheatstone E-SAT, Technical Manual

Page: 42 / 126

page 2 – 8
E-Series Network / Apr 2007
H A R D W A R E
Analog Input Card (AI-NC4)
Overview
The Analog input card accepts up to 4 stereo analog audio sources (i.e. 8
mono channels). An Audio Configuration form in the supplied XPoint
software allows the user to set attributes for the input channel hardware,
including signal name, location, and Stereo/Mono. The 8 input channels may
be configured as mono signals (one channel) or stereo signals (two channels)
in any combination.
The balanced, line level analog input signals are buffered and converted
to the digital domain by 24bit A-D converters operating at the system’s master
sample rate. Embedded logic routes each channel of audio data into an
available time slot of the input card’s TDM bus. One TDM bus is allocated for
each input card.
Analog Input Interface
The balanced analog input stages are direct coupled, unity gain circuits and
operate at a nominal input level of +4dBu. The input impedance is 20kOhm.
A +4dBu input signal will result in a -20dBFS digital output level at any of the
selected AES outputs. The maximum analog input signal level is +24 dBu
providing 20 dB of headroom above the nominal input level.
Reference Notes:
0dBu = .7746 V RMS, +4dBu = 1.23V RMS
dBFS = dB Full Scale Digital
-20dBFS = +4dBu
Internal Programming Options
There are no internal programming options on the AI-NC4 card.