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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[phone] Grass Valley Group

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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