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

28 2020ADC — Instruction Manual
Functional Description
Functional Description
The 2020ADC converts four channels of analog audio to two 48 KHz
AES/EBU signals. Refer to the block diagram in
Figure 14 while reading
the following functional description.
Note As both signal channels are identical, only one channel description is pro-
vided.
Figure 14. 2020ADC Block Diagram
–
+
CH1 (L)
In
CH2 (R)
In
Differential
Input
Receivers
& Pad
Clocks
Audio
- 12 dB
- 8 dB
- 6 dB
- 12 dB
- 8 dB
- 6 dB
Pad
–
+
Pad
- 12 dB
- 15 dB - 9 dB
- 12 dB
- 15 dB - 9 dB
Stereo
24-bit
ADC
8024_01r1
Clip,
>-20 dB
LEDs
Rotary
Switch
Toggle
Switches
FPGA
Routing and Control
Processor
AES
Receiver
and PLL
AES
Sync In
Comm,
Fault,
Lock,
Remote,
Config
and Power
LEDs
Frame
Communication
CPU
(Controller)
FLASH
ROM
75 ohm
Unbalanced
110 ohm
Balanced
CH1/2
OUT
–
+
CH3 (L)
In
CH4 (R)
In
Differential
Input
Receivers
& Pad
Clocks
Audio
- 12 dB
- 8 dB
- 6 dB
- 12 dB
- 8 dB
- 6 dB
Pad
–
+
Pad
- 12 dB
- 15 dB - 9 dB
- 12 dB
- 15 dB - 9 dB
FPGA
Routing and Control
Processor
75 ohm
Unbalanced
110 ohm
Balanced
CH3/4
OUT
Clip,
>-20 dB
LEDs
Rotary
Switch
Toggle
Switches
Passive Rear
Module
Passive Rear
Module
Passive Rear
Module
Stereo
24-bit
ADC