Grass Valley 2020DAC D-To-A - Manual (Page 28)

22 2020DAC Instruction Manual
2020DAC 4-Channel Audio Digital to Analog Converter
Digital/Analog Converter (DAC), Filter, Gain, and Output Stages
The DAC consists of a single, stereo, 24-bit, 128x over-sampling DAC. The
outputs of the DACs are differential in nature. They are received by a dif-
ferential receiver, which also serves as a Low Pass Filter (LPF). The signal
then passes through to the gain stage, where gain can be adjusted per
channel, then on to differential output drivers and then to terminal block
outputs.
The output drivers provide precision signal balance and output common
mode rejection.
Regulator
The 2020DAC’s power is fed from +24 V from the frame’s switching power
supply. DC comes into the module, is fused, and then is converted into
analog and digital voltage supplies.
Each stage of the DAC receives its own separate, highly regulated and fil-
tered power source. The following power feeds are produced:
■ Digital +5 V for microcontroller,
■ Digital +3.3 V for FPGA, DAC and other digital sections,
■ Analog ±10 V for filter and differential receiver stage, and
■ Analog ±15 V for final gain and driver stage.