Grass Valley 8920DAC User Manual
8920DAC
AES/EBU TO ANALOG AUDIO CONVERTER
Instruction Manual
071-0614-02
FIRST PRINTING: JULY 1999
REVISED PRINTING: SEPTEMBER 2000
2.0software release
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Contents
Preface
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
8920DAC AES/EBU to Analog Audio Converter
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Module Placement in the 8900 Frame. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Frame Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Loop-through Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Operation Indicator LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Local Onboard Module Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Configuring Output Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Level Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
20/24-bit DAC Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Remote Control Lockout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Remote Configuration and Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Module Configuration Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Software Update Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Signal Configuration Displays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Digital Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Control and Routing FPGA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
CPU (Controller) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Digital/Analog Converter (DAC), Filter, Gain, and Output Stages . . . . . . . . . 18
Regulator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Index
8920DAC Instruction Manual iii
Contents
iv 8920DAC Instruction Manual
Preface
About This Manual
This manual describes the features of a specific module of the 8900 Series
Modular Products family. As part of this module family, it is subject to
Safety and Regulatory Compliance described in the 8900 Series frame and
power supply documentation (see the
Instruction Manual
8900TX/8900TF/8900TFN Frames
).
8920DAC Instruction Manual v
Preface
vi 8920DAC Instruction Manual
8920DAC AES/EBU to Analog Audio Converter
Introduction
The 8920DAC converts digital audio to analog audio and provides true 20bit performance. Its various modes can modify the outgoing signal to
provide channel swapping, channel summing, tones, and phase inversion.
When used in an 8900 frame supporting network control, the 8920DAC
supports remote mode selection. The module uses 24-bit delta-sigma
digital-to-analog converters (DACs) with 128 times over-sampling and
noise shaping which offer superior performance with lower idle tones, and
excellent sonic performance and resolution.
8920DAC features include:
■
Support for 32 kHz, 44.1 kHz, and 48 kHz sampling rates
■
Jumper selectable 20-bit or 24-bit DAC mode
■
One 75
One pair of balanced analog outputs available on terminal block
■
outputs using BNC adapter board
■
Input sampling frequency, emphasis, and error LED indicators
Output range selection from +14 dBu to +24 dBu with jumper selectable
■
maximum level
Ω
loop-through AES-3id/EBU input
■
Channel level control using an on-board, multi-turn trim potentiometer
■
Auto detection of emphasis and engagement of de-emphasis to flatten
frequency response
Module is part of the 8900 family of audio and video modules
■
■
Supports remote control in 8900 networking frames
■
Offers remote control lockout using an on-board jumper
8920DAC Instruction Manual 1
8920DAC AES/EBU to Analog Audio Converter
Installation
Installation of the 8920DAC module is a process of:
Placing the module in the desired frame slot,
■
■
Cabling and terminating signal ports, and
■
Configuring the module.
The 8920DAC module can be plugged in and removed from an 8900 Series
frame with power on. When power is applied to the module, LED indica-
tors reflect the initialization process (see Power Up on page 5 ).
Module Placement in the 8900 Frame
There are ten cell locations in the frame to accommodate either analog or
digital modules. These are the left ten locations. Refer to Figure 1.
The two cells on the right are allocated for the power supplies. For addi-
tional information concerning the Power Supply module, refer to the 8900
Power Supply manual.
The third cell from the right is allocated for the Frame Monitor or Network
Interface controller modules. These modules provide health monitoring
and control options.
Figure 1. 8900 Series Frame
Any 8900 Module
Frame Monitor Module or
Network Interface Module
Power
Supplies
(only)
0614-04r1
2 8920DAC Instruction Manual
1.
3.
8900 modules are interchangeable within the module cells. There are 10
BNC connectors in each cell’s I/O group. The functional assignment of
each connector in a group is determined by the module that is placed in
that cell. The maximum number of modules an 8900 frame can accept is ten.
Figure 2 illustrates the rear connector plate for an 8900 Series frame.
Frame Capacity
The maximum number of 8900 modules allowed in a frame is determined
by frame cooling capacity. Table 1 provides the power capacity, cooling
capacity, and maximum module count for the 8920DAC in each frame type.
Table 1. Power, Cooling, and Module Capacity of 8900 Frames
Power (W) 60 60 100 100 100
Recommended Module Cooling (W) 30 60 30 90 90
8920DAC Modules 10 10 10 10 10
Capacity Calculated
8900T2
Frame
8900T2-F
Frame
8900TX
Frame
8900TF
Frame
Installation
8900TFN
Frame
DA10
J1 J2
O
J3 J4
U
T
J5 J6
J7 J8
J9 J10
IN
DA9
J1 J2
J2
O
J3 J4
J4
U
T
J5 J6
J6
J7 J8
J8
J9 J10
IN
Note
Module capacity figures assume no other modules are in the frame. If the
maximum number of modules a frame can handle is less than ten, provide as
much space between the modules as possible.
Figure 2. 8900 Series Frame Rear Connectors
DA8
J1 J2
O
J3 J4
U
T
J5 J6
J7 J8
J9 J10
IN
DA7
J1 J2
J2
O
J3 J4
J4
U
T
J5 J6
J6
J7 J8
J8
J9 J10
IN
DA6
J1 J2
O
J3 J4
U
T
J5 J6
J7 J8
J9 J10
IN
DA5
J1 J2
J2
O
J3 J4
J4
U
T
J5 J6
J6
J7 J8
J8
J9 J10
IN
DA4
J1 J2
O
J3 J4
U
T
J5 J6
J7 J8
J9 J10
IN
DA3
J2
J1 J2
O
J4
J3 J4
U
T
J6
J5 J6
J8
J7 J8
J9 J10
IN
DA2
J1 J2
O
J3 J4
U
T
J5 J6
J7 J8
J9 J10
IN
DA1
J1 J2
O
J3 J4
U
T
J5 J6
J7 J8
J9 J10
IN
8900 modules can be inserted and removed while the frame is powered. To
install a module in the frame:
Insert the module, connector end first, with the component side of the
module facing to the right and the ejector tab to the top.
2.
Verify that the module connector seats properly against the backplane.
0614-03
Press the ejector tab in to seat the module in place.
8920DAC Instruction Manual 3
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