GRASS VALLEY 2020ADC User manual

2020ADC
4-CHANNEL AUDIO A-D CONVERTER
Instruction Manual
SOFTWARE VERSION 2.0
071802402
MAY 2007

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2020ADC
4-CHANNEL AUDIO A-D CONVERTER
Instruction Manual
SOFTWARE VERSION 2.0
071802402
MAY 2007

4 2020ADC — Instruction Manual
Contacting Grass Valley
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This product may be covered by one or more U.S. and foreign patents.
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Software Downloads — Download software updates, drivers, and patches.
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2020ADC — Instruction Manual 5
Contents
Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2020ADC 4-Channel Audio Analog to Digital Converter. . . . . . . . . . . . . . . . 9
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Module Placement in the 2000 Frame. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Audio Reference Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Operation Indicator LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Local Onboard Module Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Input Level Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Configuring Output Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Remote Control Lockout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Remote Configuration and Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Module Configuration Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Signal Configuration Displays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Software Update Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Differential Input, Analog Gain and A/D Converters . . . . . . . . . . . . . . . . . . . . 29
Digital Reference Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Routing and Control FPGA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

6 2020ADC — Instruction Manual
Contents

2020ADC — Instruction Manual 7
Preface
About This Manual
This manual describes the features of a specific 2000 Series module in the
Kameleon Media Processing System. As part of this module family, it is
subject to Safety and Regulatory Compliance described in the 2000 Series
frame and power supply documentation (see the 2000 Series Frames Instruc-
tion Manual).

8 2020ADC — Instruction Manual
Preface

Instruction Manual 9
2020ADC 4-Channel Audio
Analog to Digital Converter
Introduction
The 2020ADC converts four channels of analog audio to two balanced or
unbalanced digital audio outputs. All signals are connected via the corre-
sponding passive rear module in the back of the 2000 frame. The four chan-
nels of analog audio enter via plug-in terminal blocks. A 48 kHz AES/EBU
reference, connected to the loop-through input BNCs, is required to lock
the module. Digital outputs are available through 75 ohm BNCs (unbal-
anced) or plug-in terminal blocks (balanced).
The 2020ADC can modify the incoming gain of each analog channel and
provides a choice of output modes.
The 2020ADC features:
• AES/EBU loop-through reference input,
• 48 kHz sampling rate,
• 24-bit quantization,
• Conversion of four channels of analog audio,
• Two 75 ohm (unbalanced) or 110 ohm (balanced) outputs,
• Choice of output modes include normal, channel swap, phase invert,
channel summing and tone,
• Independent input level control from +12 dBu to +28 dBu,
• Remote control and monitoring, and
• Remote control lockout via onboard jumper.

10 2020ADC — Instruction Manual
Installation
Installation
Installation of the 2020ADC module is a process of:
• Placing the passive rear module in a rear frame slot,
• Placing the media module in the corresponding front slot, and
• Cabling and terminating signal ports.
The 2020ADC module can be plugged in and removed from a 2000 Series
frame with power on. When power is applied to the module, LED indica-
tors reflect the initialization process (see Power Up on page 14).
Module Placement in the 2000 Frame
There are twelve slot locations in both the front and rear of a 3RU frame to
accommodate 2000 Series modules. The 2020ADC consists of a two module
set with a front media module and a passive rear module that can be
plugged into any of the 12 frame slots. Each 2020ADC front media module
plugs into the front of the 2000 frame mid-plane. The passive rear module
plugs into the corresponding rear slot to provide the input and output
interface connectors.
To install a 2020ADC module set in the frame:
1. Locate a vacant slot in the rear of the 3 RU frame (Figure 1).
Figure 1. 3 RU Frame, Rear View
Mid-frame motherboard
with power and
communication buses
Rear media module slots 1 – 6Rear media module slots 7 – 12
8025-04r1

2020ADC — Instruction Manual 11
Installation
2. Insert the passive rear module into the vacant rear slot of the frame as
illustrated in Figure 2.
Figure 2. Installing Passive Rear Module
3. Verify that the module connector seats properly against the midplane.
4. Using a crossblade screwdriver, tighten the two screw locks to secure
the module in the frame.
5. Locate the corresponding front slot in the frame. The 3 RU frame front
view is illustrated in Figure 3.
Figure 3. 2000 Series 3 RU Frame, Front Slots
2020
ADC
J10 J9 J8 J7 J6 J5 J4 J3 J2 J1
CH3 (L) IN
OUT
REF
CH4 (R) IN
CH3/4
GÐ+ GÐ+ GÐ+ GÐ+ GÐ+ GÐ+
CH1 (L) IN CH2 (R) INOUTCH1/2
Alignment post
and receptacle Screw lock
(both sides)
8024_05r1
2000 frame (rearview)
2020ADC Passive RearModule
Board edge guides
(both sides)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(1)
Front Media Modules
Slots 1-12
8024 -07

12 2020ADC — Instruction Manual
Installation
6. With the component side up, insert the front media module in the
corresponding front slot (see Figure 4).
7. Verify that the module connector seats properly against the midplane
and rear module connector.
8. Press firmly on both ejector tabs to seat the module.
Figure 4. Installing Front Media Module
2020ADC
Alignment post and receptacle
8024-06
2000 Frame (front view)
Board edge
guides
Board edge
guides

2020ADC — Instruction Manual 13
Installation
Cabling
All cabling to the 2020ADC module is done on the corresponding passive
rear module at the back of the 2000 frame. Refer to Figure 5 on page 13 for
an illustration of the rear connections referenced in the steps below.
Inputs
Connect the analog audio inputs to the four terminal blocks on the passive
rear module as given in Table 1.
Outputs
Two 75 ohm unbalanced and two 110 ohm balanced outputs are provided
on the passive rear module. Connect output destinations to either the bal-
anced or unbalanced output connectors given in Table 2.
Audio Reference Input
Connect a 48 kHz AES/EBU audio reference to the looping REF input at J5
or J6. Terminate the unused input with 75 ohm if not looping to another
device.
Figure 5. 2020ADC Input/Output Connectors
Table 1. Audio Input Connections
Audio Channel Terminal Block
1 (Left) J8, CH1 (L) IN
2 (Right) J7, CH2 (R) IN
3 (Left) J2, CH3 (L) IN
4 (Right) J1, CH4 (R) IN
Table 2. Audio Output Connections
75 ohm Unbalanced Outputs 110 ohm Balanced Outputs
Audio Channel BNC Connector Audio Channel Terminal Block
1/2 J9, CH1/2 OUT 1/2 J10, CH1/2 OUT
3/4 J3, CH3/4 OUT 3/4 J4, CH3/4 OUT
8024_02r1
2020
ADC
J10 J9 J8 J7 J6 J5 J4 J3 J2 J1
CH3 (L) IN
OUT
REF
CH4 (R) IN
CH3/4
G–+G–+G–+G–+G–+G–+
CH1 (L) IN CH2 (R) INOUT
CH1/2

14 2020ADC — Instruction Manual
Power Up
Power Up
The front LED indicators and configuration switches are illustrated in
Figure 6. Upon power-up, the green PWR LED should light and the yellow
CONF LED should illuminate for the duration of module initialization.
Operation Indicator LEDs
With factory default configuration and valid input and reference signals
connected, the green PWR LED and the green LOCK LED should be on.
Figure 6. Operation Indicator LEDs
8024_04
CH1 In > -20dBFS(green)
CH2 In > -20dBFS(green)
CH3 In > -20dBFS(green)
CH4 In > -20dBFS(green)
CH1 Clip (red)
CH3 Clip (red)
CH4 Clip (red)
CH2 Clip (red)
FAULT (red)
COMM (yellow)
CONF (yellow)
PWR (green)
REM OVER (yellow)
LOCK (green)

2020ADC — Instruction Manual 15
Power Up
A red FAULT LED indicates an error situation and, with the other LEDs,
can indicate the operational conditions presented in Table 3. The table
describes signal output and LED indications for various input/reference
combinations and user settings.
Table 3. Indicator LEDs and Conditions Indicated
LED Indication Condition
FAULT
(red)
Off Normal operation.
On continuously Module has detected an internal fault.
Flashing Reference input is faulty or not present.
COMM
(yellow)
Off No activity on frame communication bus.
Long flash Location Command received by the module from a remote control system.
Short flash Activity present on the frame communication bus.
CONF
(yellow)
Off Module is in normal operating mode.
On continuously Module is initializing, changing operating modes or updating firmware. Simultaneous
CONF and FAULT LEDs on indicate FPGA load error.
Flashing Indicates rate of change of paddle-controlled analog setting.
PWR
(green)
Off No power to module or module’s DC/DC converter failed.
On continuously Normal operation, module is powered.
REM OVER
(yellow)
Off Module configuration matches switch and jumper settings.
On continuously Module configuration may not match switch and jumper settings. Control has been
remotely overridden.
LOCK
(green)
Off Module does not detect a valid AES in reference signal.
On continuously Valid AES in reference signal is present and module is locked to it.
20 dB
CH1-4
(green)
Off Channel level is less than -20 dBFS.
On continuously Channel level is greater than -20 dBFS.
Flashing Channel level is transitioning through -20 dBFS
CLIP
CH1-4
(red)
Off Channel digitized signal level is less than -0.5 dBFS.
On continuously Channel digitized signal level is greater than -0.5 dBFS.
Flashing Channel digitized signal level is transitioning through -0.5 dBFS.

16 2020ADC — Instruction Manual
Configuration
Configuration
The 2020ADC can be configured locally using on-board switches and
jumpers, or remotely using the 2000NET network interface. Configuration
and adjustment items for the 2020ADC include:
• Input level (Ch 1 – Ch 4) – gain adjustment of analog input levels for
full-scale digital outputs,
• Output mode – channel swapping, summing, and phase inversion, and
• Control mode – Local/remote or local control only (remote lockout).
Local Onboard Module Configuration
The 2020ADC module can be configured locally using the jumper, the
rotary switches and four paddle switches shown in Figure 7. The CONF
LED indicates status of the configuration process.
These components perform the following:
• Jumper JP2 sets control mode for Local only or Remote and Local.
• Function (rotary) switches SW2 (CH1/2) and SW 5 (CH3/4) select the
desired output configuration (0 through 9, A through F). Either func-
tion switch position 0 or F (Factory defaults) can be used to return the
module configuration to the original factory default settings.
• Paddle Switches (CH 1 – 4) adjust the gain of each analog audio input
channel for full-scale digital outputs.
• CONF (configuring) LED, when on, indicates the module is initializing
or processing configuration information.
Figure 7. Module Configuration Switches and LEDs
8024_03r1
Remote Control Lockout
JP2
LOCAL
LOCAL & REM
Jumper across these pins
locks out remote control
Jumper across these pins
enables remote and
local control
SW2 – CH 1/2 Function Rotary Switch
SW5 – CH 3/4 Function Rotary Switch
SW4 – CH3 In Level
SW6 – CH4 In Level
SW1 – CH1 In Level
SW3 – CH2 In Level
1
CONF – configuration processing LED

2020ADC — Instruction Manual 17
Configuration
Input Level Adjustments
Four paddle switches (Ch 1 – Ch 4 In Level) are supplied on the front of the
module to adjust gain to set the maximum signal level of the analog input
for full-scale digital outputs (0 dBFS) on Channels 1 – 4. The paddle
switches will adjust the gain by 0.1 dB increments. Coarse gain increments
in 2 dB steps automatically through on-board circuitry when the appro-
priate gain is reached with the paddle switch.
Using Input Level Paddle Switches
Note The paddle switches increment gain by approximately 0.1 dB when held
momentarily. Holding the switch to the left or right for about 1 second acti-
vates a continuous change mode that ramps the change rate from about 0.1
dB per second to 0.6 dB per second. The yellow CONF LED will flash slow (0.1
dB rate) or fast (0.6 dB rate) according to the change rate.
Set the CH 1/2 and CH 3/4 Function Rotary Switch at the front of the
module to the Default position marked 0 as shown at left. The Default posi-
tion will put each channel output into a normal mode with no phase inver-
sion, channel swapping or summing.
To correctly adjust the 2020ADC for your digital application, determine
your maximum signal level (MSL). This is the level above which digital
clipping occurs. This module has been set up at the factory with a
maximum signal level default value of +24 dBu = 0 dBFS. There are three
ways to adjust the paddle switches for the proper level:
• Apply the maximum signal level for your device to the analog input
and monitor the AES output with a meter that indicates digital level in
dBFS. Adjust the paddle switch for each channel until the meter indi-
cates 0.0 dBFS.
Note Because the paddle switches have a resolution of 0.1 dB, you may not be able
reach 0.0 dBFSexactly. Use the closest negative setting possible.
• Apply an input audio level that is -20 dB below the maximum level,
(+4 dBu for the default, +24 dBu -20 dB=+4 dBu) and adjust the AES
output as indicated on a digital audio meter to -20 dBFS.
Note If you have no meters calibrated in dBFSyou can use the tone output position
to compare with the output level. Tone output is position E on the Function
Switch and outputs a 1 kHz tone at -20 dBFS. Note the internal tone level indi-
cation while monitoring the AESoutput and switch back to 0 or F position on
the Function Switch, then adjust the gain paddle switch to the same level as
the internal tone level.
• Apply the maximum signal level to the input and adjust the paddle
switch for each channel until the clip LED comes on. This is -0.5 dBFS,
and by tapping the paddle switch four more times you will be within
0.15 dB (worst case) of the correct setting.
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Default
Position

18 2020ADC — Instruction Manual
Configuration
Configuring Output Mode
The 2020ADC provides thirteen possible output configurations as shown
in Table 4. The module can be configured using the rotary switches shown
in Figure 7 on page 16. To make a configuration setting, rotate the switch
for CH 1/2 and CH 3/4 to the desired output configuration. The 16-posi-
tion rotary switch selects one of 13 possible output modes. Positions B and
C are not used and positions 0 and F select the same mode—the factory
default.
Table 5 provides the possible input conditions and the output condition
that results.
Remote Control Lockout
When a jumper is placed across pins 1 and 2 of jumper block JP7 (see
Figure 7 on page 16), module output mode settings are adjustable from the
local on-board switches only. To have both local and remote access, set the
jumper across pins 2 and 3.
Table 4. 2020ADC Output Mode Configuration
Switch
Position Mode Description
0 Factory default – No phase inversion, channel swapping or summing
1 Channel swap – Left and Right
2 Both channels phase inverted
3 Left channel phase inverted
4 Right channel phase inverted
5 Right channel to both channel outputs
6 Left channel to both channel outputs
7 Left + Right to both channel outputs (-6dB mono sum)
8 Left - Right to both channel outputs
9 Left + Right to Left channel output and Left- Right to Right channel output
A Left + Right to both channel outputs and both channels phase inverted
B Not used (outputs AES silence)
C Not used (outputs AES silence)
D Tone 1 to all channels (AES silence)
E Tone 2 to all channels (1 kHz, -20 dBFS)
F Factory default – No phase inversion, channel swapping or summing
Table 5. Possible Operating Conditions
Audio Input Condition Reference Input Condition Output Condition
Audio inputs present Valid reference input present AES/EBU serial digital output sampled at 48 kHz.
No audio input signal present Valid reference input present AES/EBU serial digital output sampled at 48 kHz. See S/N specification for level.
Audio inputs present Reference not present AES/EBU serial digital output sampled at approximately 47.992 kHz. Internal freerun clock
rate.
Audio inputs present Invalid reference input Invalid AES/EBU serial digital output.

2020ADC — Instruction Manual 19
Configuration
Remote Configuration and Monitoring
2020ADC configuration and monitoring can be performed remotely using
the 2000NET interface (see Figure 8). This section describes the GUI access
to the module configuration functions. Refer to the 2000NET Network
Interface Module Instruction Manual for information on setting up and
operating the 2000 frame network.
For remote access, make sure jumper block JP7 on the module is set for both
Local and Remote access (Figure 7 on page 16).
Note The physical appearance of the menu displays shown in this manual repre-
sent the use of a particular platform, browser and version of 2000NET
module software. They are provided for reference only. Displays will differ
depending on the type of platform and browser you are using and the version
of the 2000NET software installed in your system.
Figure 8. 2000NET GUI
The 2000 modules can be addressed by clicking on a specific module icon
in the frame status display or on a module name or slot number in the link
list on the left.
8026-08
The Links section lists the frame and its current modules. The selected link's Status
page is first displayed and the sub-list of links for the selection is opened. The sub-list
allows you to select a particular information page for the selected device.
Content display section displays the information page
for the selected frame or module (frame slot icons are also
active links).

20 2020ADC — Instruction Manual
Configuration
Module Configuration Displays
The 2000 GUI provides the following links and displays for the 2020ADC
module (Figure 9):
• Module Configuration displays showing status and slot configuration
information (location and user assigned names), and
• Signal Configuration displays.
The Module Configuration displays operate in the same manner for all
remote controllable 2000 modules. Refer to the 2000NET manual for more
information on these displays. Some functions listed may not be supported
by a particular module. These will be indicated as not supported.
Figure 9. 2020ADC Display Links
Signal Configuration Displays
This section discusses the Signal Configuration Displays available to set
and monitor the 2020ADC module parameters remotely.
Software Update Display
Remote software updating is not supported on the 2020ADC module. Soft-
ware updating requires a cable assembly and kit available from Grass
Valley Customer Service (8900-FLOAD-CBL). Refer to the 2000NET
manual and the Thomson Grass Valley web site at
http://www.thomsongrassvalley.com for complete details.