Ensemble Designs 6020 Four Channel 24-bit Audio DAC - Manual (Page 2)

MODULE OVERVIEW
The 6020 Four Channel 20-bit Digital to Analog Converter (DAC) converts two AES digital
audio streams to four channels of analog audio. Digital to analog conversion is performed
with 20-bit precision.
As shown in the block diagram below, two AES audio inputs from BNCs on the backplane
enter the module and pass through AES receiver circuitry to the digital to analog convert-
ers. A gain adjustment is provided for the analog output levels. The buffered audio is then
fed to the output to a 15-pin high density connector. Unbalanced monitor outputs are
provided on BNC connectors.
Status indicators include error detection for noting presence of valid AES input signals as
well as indication that emphasis flags have been set on either AES input. Appropriate de-
emphasis is applied automatically when a flag is set.
Control of the module can be from one of the remote Avenue options or from the local
controls on the front of the module. The gain of the analog output stages can be adjusted
remotely or locally. The on-board microprocessor communicates with the frame for remote
control via the Avenue System Control module if installed. Module ID information (slot
location, software version and board revision) and status information can be monitored by
the frame System Control module and read using the optional interfaces available. Alarms
can also be enabled if desired.
Power is derived from the ± 12 volt frame power. It is regulated to the required voltages
for the module by on-board regulators. The module is fused with resettable fuse devices. If
the fuse opens due to an overcurrent condition, the module will lose power. After pulling
the module, the fuse will reset automatically requiring no replacement fuse.
Model 6020 Four Channel 20-bit Audio DAC
DAC
DAC
AES
RX
AES
RX
Balanced
Analog
Outputs
Balanced
Analog
Outputs
AES
Input
AES
Input
Gain
Adj.
Gain
Adj.
Gain
Adj.
Gain
Adj.
Microcontroller
Remote
Control
Level
Control
Status
Indicators
6020 Four Channel 20-bit Audio DAC Functional Block Diagram
6020-2