ATSAM3703 datasheet(27/36 Pages) ATMEL

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6237A–DRMSD–29-May-06

ATSAM3703

9.5

Digital Audio

Pins used:

• CLBD, WSBD (outputs)

• DABD3 - 0 (outputs)

• DAAD3 - 0 (inputs)

And optionally

• CLAD3 - 0, WSAD3 - 0 (inputs)

The ATSAM3703 allows for 8 digital audio output channels and 8 digital audio input channels.

All audio channels are normally synchronized on single clocks CLBD, WSBD which are derived

from the IC crystal oscillator. However, as a firmware option, the DAAD3 - 0 inputs can be syn-

chronized with incoming CLAD3 - 0 and WSAD3 - 0 signals. In this case, the incoming sampling

frequencies must be lower or equal to the chip sampling frequency.

The digital audio timing follows the I2S standard, with up to 24 bits per sample.

Figure 9-4.

Digital Audio Timing

C is related to tCK, the crystal period at X1, as shown in Table 9-16.

The choice of sample frequency is done by the firmware.

Table 9-15.

Digital Audio Timing Parameters

Symbol

Parameter

Min

Typ

Max

Unit

CLBD rising to WSBD change

C - 10

tSOD

DABD valid prior/after CLBD rising

tC - 10

CLBD

CLBD cycle time

2*tc

Table 9-16.

Sample Frequency

WSBD

Typical Sample

Frequency

CLBD/WSBD Freq Ratio

1/(tCK * 128)

96 kHz

tCK

1/(t

CK * 192)

64 kHz

2 * t

1/(tCK * 256)

48 kHz

2 * tCK

1/(tCK * 384)

32 kHz

4 * tCK

tCW

tSOD

tCLBD

WSBD

CLBD

DABD3 - 0

DAAD3 - 0

ATSAM3703 Datasheet(PDF) 27 Page - ATMEL Corporation

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