CXD2720Q Datasheet, PDF (12/40 Pages) Sony Corporation – Single-Chip Digital Signal Processor for Karaoke

CXD2720Q
Description of Functions
1. Master/Slave Modes
[Relevant pins] XMST, LRCK, BCK
When connecting multiple CXD2720Qs, or when using as a pair with a D/A converter such as the CXD2558M,
one of the CXD2720Q should be in master mode to supply LRCK and BCK.
The clock applied to LRCK and BCK in slave mode must be synchronized to either the crystal oscillator clock
of the XTLI and XTLO pins or the external clock input from the XTLI pin
XMST
H
L
Mode
Slave mode
Master mode
LRCK, BCK I/O
Input
Output
Table 1-1. LRCK, BCK Mode Setting
2. Master Clock System
[Relevant pins] XTLI, XTLO, BFOT
768fs (fs = 44.1kHz) is assumed for the master clock system, and the connection is as shown below. (Please
inquire with regard to use at other than fs = 44.1kHz.)
(1) Master
Frequency divider
768fs
O 384fs
BFOT
I
XTLI
O
768fs
XTLO
(2) Slave
768fs
I
768fs
XTLI
O OPEN
XTLO
– 12 –