Ross AMA-8511, User Manual

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Introduction AMA-8511 User Manual (Iss. 03)
Overview
The RossGear AMA-8511 AES/EBU Distribution Amplifier and Converter is a broadcast quality
digital AES/EBU audio reclocking distribution amplifier, as well as a modular product used to convert
20 or 24 bit AES-3id (coaxial) signals to analog audio. The AMA-8511 accepts one 32, 44.1, or
48kHz sample rate AES/EBU audio signal and provides two copies of balanced stereo (A, B) analog
audio and four reclocked copies of the input signal. The RossGear AMA-8511 is designed for use in
75-ohm coaxial SMPTE 276M or AES-3id systems.
The AMA-8511 provides automatic cable equalization for lengths up to and beyond 610m (2000 ft.).
The D/A converter uses a state of the art 24bit 128X over-sampled Delta Sigma Modulator DAC to
convert to analog audio. Following the D/A conversion, the analog audio passes through a very high
quality reconstruction filter that assures low distortion and noise. Two identical copies of the analog
signal are output via the rear plug-on module, the CON-8516 AES Audio Connector (included with
the card).
A coarse level adjustment headroom jumper (18dB or 24dB), and a fine adjustment potentiometer
(±6dB) are provided to precisely match to your facility’s house reference audio level. The AMA-8511
can accommodate any full-scale digital (FSD) level in the -12 to - 30dBFS range. Automatic detection
of AES/EBU 50/15
µ
s de-emphasis is available for all data rates.
The AMA-8511 has been designed with the capability to report a variety of AES signal errors
including No Lock, Coding, Parity, CRC, and Validity. These errors are indicated on a card edge
LED. In addition, there is a SMPTE 269M fault reporting output to the back of the Ross frame.
The AMA-8511 fits into Ross 8000A series digital frames, the DFR-8110A (2RU) and the DFR-
8104A (1RU), and provides system builders with the ability to easily distribute and convert digital
audio within a facility.
A reclocking amplifier is the preferred method of distribution for long coaxial runs to reduce jitter in
the data stream. The AMA-8511 performs reclocking in a two-stage process that develops an output,
which is stable and noise-free.
The AMA-8511 is part of a complete line of RossGear AES solutions that includes distribution,
conversion, and monitoring. Designed and manufactured to meet the highest quality broadcast
industry standards, the RossGear AMA-8511 is an ideal, flexible, and cost effective solution for your
digital audio reclocking distribution and digital to analog conversion requirements.
Functional Block Diagram
Figure 1. Simplified Block Diagram of AMA-8511 Functions