Platinum™ IP3
Installation and Operation Manual
Analog/Digital Audio Converter Modules with TDM
© 2016 Imagine Communications Corp.
Proprietary and Confidential.
September 2016 | Page 213
Back Panel I/O Module for PM-ADCT-IB/PT-ADCT-IB
The
PT-A2-BP
back panel I/O module corresponds to the PM-ADCT-IB and
PT-ADCT-IB
modules. DB-44
connectors are used on the
PT-A2-BP
. The optional
PT-A2-DTB
terminal block adapter is available to
accommodate wiring of individual signals to the frame.
Figure 95:
PT-A2-DTB Terminal Block Adapter
Analog Inputs
The PM-ADCT-IB/
PT-ADCT-IB
provides 16 dual channel balanced analog audio inputs via the
PT-A2-BP
back module. The standard option provides high impedance inputs; optional 600
terminated inputs
are also available. Input signals are received by high-quality, audio line receivers containing internal
laser-trimmed, matched resistors for maximum common mode rejection. The signals are converted from
balanced to single-ended by the receivers, and are then attenuated and AC-coupled to the second stage
attenuators.
Digitally controlled audio attenuators provide users with the ability to set digital full scale to a variety of
analog audio levels. These low-noise, low distortion attenuators can be software controlled to provide a
wide range of full scale settings.
The output signals from the second stage are then buffered and converted to differential signals in
preparation for presentation to the converters, along with a gain adjustment to compensate for the first
stage attenuation required prior to the digital attenuators.
The final analog stage provides low-pass filtering and the addition of a DC offset before presenting the
audio signal to the A/D converter.
