AD1895 datasheet(22/24 Pages) AD

22 / 24 page

REV. B

AD1895

–22–

Serial Data Port Master Clock Modes

Either of the AD1895 serial ports can be configured as a

master serial data port. However, only one serial port can be

amaster, while the other has to be a slave. In Master Mode, the

AD1895 requires a 256

× fS, 512 fS, or 768 × fS master clock

(MCLK_IN). For a maximum master clock frequency of 30 MHz,

the maximum sample rate is limited to 96 kHz. In Slave Mode,

sample rates up to 192 kHz can be handled.

When either of the serial ports is operated in Master Mode, the

master clock is divided down to derive the associated left/right

subframe clock (LRCLK) and serial bit clock (SCLK). The master

clock frequency can be selected for 256, 512, or 768 times the

input or output sample rate. Both the input and output serial

ports will support Master Mode LRCLK and SCLK generation

for all serial modes, left justified, I

2S, right justified, and TDM

for the output serial port.

Table IV. Serial Data Port Clock Modes

MMODE_0/

MMODE_1/

MMODE_2

210

Interface Format

000Both Serial Ports Are in Slave Mode

001

Output Serial Port Is Master with 768

× f

S_OUT

010Output Serial Port Is Master with 512

× fS_OUT

011

Output Serial Port Is Master with 256

× f

S_OUT

100Undefined

101

Input Serial Port Is Master with 768

× fS_IN

110

Input Serial Port Is Master with 512

× f

S_IN

111

Input Serial Port Is Master with 256

× f

S_IN

Bypass Mode

When the BYPASS pin is asserted high, the input data bypasses

the sample rate converter and is sent directly to the serial output

port. Dithering of the output data when the word length is set

to less than 24 bits is disabled. This mode is ideal when the

input and output sample rates are the same and LRCLK_I and

LRCLK_O are synchronous with respect to each other. This

mode can also be used for passing through nonaudio data,

since no processing is performed on the input data in this mode.

AD1895 Datasheet(PDF) 22 Page - Analog Devices

AD1895 Datasheet(HTML) 22 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

Datasheet Download

Link URL