Maxtor 777 W V1.0 Manual de instrucciones descargar pdf (Pagina 48)

48 8921ADT Instruction Manual

Functional Description

Refer to the block diagram in Figure 21 for the following functional

description.

The 8921ADT receives four channels of balanced analog audio differen-

tially to reduce common mode interference. The audio inputs are con-

verted into single-ended signals that feed a gain ampliﬁer where the

maximum input levels can be adjusted to just below the clip point for the

analog to digital converter.

Figure 21. 8921ADT Functional Block Diagram

Audio

In 1

Audio

In 2

Audio

In 3

Audio

In 4

Reference

Fault

Pwr Comm

Conf

Ovr

Frame

Bus

Balanced Analog

Audio Inputs

–

Maximum Input

Level Adjust

Delay Adjust

> -40 dBFS/Clip 1-4

Trk On

AES 1 Mode

AES 2 Mode

Control

Control Paddle

Locked

Bank 2 LED

Silence Tone

Input

Timing

to Module

Control

to Module

1 kHz/400 Hz

Tone Gen

Input

Output

Processing

AES 1/ 2

Gain

Status Bits

Delay Adjust

Channel

Pairing

A-D Convertion

Gain Amplifiers

Deserializers

Level Detection

Multiplexer (4 x 4 Router)

Gain and AES Output

Ch 1/2

Ch 3/4

Output Drivers

Bal/Unbal

Switch

Bal/Unbal

Switch

Output Drivers

AES 1

Out

AES 2

Out

Trk In

Trk Out

Genlock Timing

Generator

Sync Separator

Control and Status Registers

Input 1-4 LEDs

RS232

Tracking

Data I/O

LEDs

Microcontroller

8204_01

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 57 58

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Maxtor 777 W V1.0 Manual de instrucciones Pagina 48

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