ADAV803ASTZ datasheet(24/56 Pages) AD

24 / 56 page

ADAV803

Rev. 0 | Page 24 of 56

DIR BLOCK

DIR_LF

Ω

AVDD

6.8nF

Figure 42.

one

l Dig

udio

tand

ADAV803 can receive and tra

PDIF, AES/EBU

958 serial str

/EBU is a profe

958 has

sumer and pro

ta sheet is

tended to f

rds. Con

e full specification

e digita

audio control info

e-mark

d. This encoding me

content of the

itted signal. As c

in the

al data end up with m

e biphase-

encoded data, while 0s in

ta do not. Note

e biphase-mark encod

a transition

en bit bounda

CLOCK

DATA

DIR Loop Filter Comp

nts

Seria

ital A

Transmission S

ards

The

nsmit S

, and

IEC-

eams. SPDIF is a consumer audio standar

and AES

ssional audio standard. IEC-

both con

fessional definitions. This da

not in

ully define or to provide a tutorial for thes

standa

tact the international standards-setting bodies

for th

All thes

l audio communication schemes encode audio

data and

rmation using the biphas

metho

thod minimizes the dc

transm

an be seen from Figure 43, 1s

origin

idcell transitions in th

mark

the original da

that th

data always ha

betwe

ries.

(2 TIMES BIT RATE)

BIPHASE-MARK

DATA

Figure 43. Biphase-Mark Encoding

Digital audio-communication schemes use preambles to

distinguish among channels (called subframes) and among

longer-term control information blocks (called frames).

Preambles are particular biphase-mark patterns, which contain

encoding violations that allow the receiver to uniquely

recognize them. These patterns and their relationship to frames

and subframes are shown in Table 8 and Figure 44.

Table 8. Biphase-Mark Encode Preamble

Biphase Patterns

Channel

11100010 or 00011101

Left

11100100 or 00011011

Right

11101000 or 00010111

Left and CS block start

PREAMBLES

LEFT CH

FRAME 191

FRAME 0

FRAME 1

RIGHT CH

LEFT CH

RIGHT CH

LEFT CH

RIGHT CH

SUB-

FRAME

SUB-

FRAME

Figure 44. Preambles, Frames, and Subframes

The biphase-mark encoding violations are shown in Figure 45.

Note that all three preambles include encoding violations.

Ordinarily, the biphase-mark encoding method results in a

polarity transition between bit boundaries.

PREAMBLE X

PREAMBLE Y

PREAMBLE Z

Figure 45. Preambles

The serial digital audio communication scheme is organized

using a frame and subframe construction. There are two

subframes per frame (ordinarily the left and right channel).

Each subframe includes the appropriate 4-bit preamble, up

24 bits of audio data, a validity (V) bit, a user (U) bit, a channel

status (C) bit, and an even parity (P) bit. The channel status bits

and the user bits accumulate over many frames to convey

control information. The channel status bits accumulate over a

192 frame period (called a channel status block). The user bits

accumulate over 1,176 frames when the interconnect is imple-

menting the so-called subcode scheme

(EIAJ CP-2401). The

ional audio standard from a software

point of view only. The digital interface supports only

onsumer mode.

organization of the channel status block, frames, and subframe

is shown in Table 9 and Table 10. Note that the ADAV803

supports the profess

Table 9. Consumer Audio Standard

Data Bits

Address

= 0

hannel

Emphasis

Copy-

Non-

Pro/

Con

Status

right

Audi

N + 1

Category Code

N + 2

Channel Number

Source Number

N + 3

Reserved

Accuracy

Clock

Sampling Frequency

N + 4

Reserved

Word Length

N + 5 to

(N + 23)

Reserved

N =

0x20 fo

ceiver ch

0x38 for transmitte

r re

annel status buffer.

r channel status buffer.

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