[AK4129]
OPERATION OVERVIEW
■ Synchronous and Asynchronous Modes Setting
There are two modes of operation: asynchronous and synchronous modes. The AK4129 is set to Synchronous mode when
the INAS pin is “L” and it is set to Asynchronous mode when the INAS pin is “H”.
FSI pin
L
Mode
Data
LRCK
BICK
SDTI1
SDTI2
SDTI3
SDTI1
SDTI2
SDTI3
Synchro
nous
ILRCK1
(Note 21)
IBICK1
(Note 22)
ILRCK1
ILRCK2
ILRCK3
IBICK1
IBICK 2
IBICK 3
Asynchr
onous
H
Note 21. ILRCK2-3 pins must be connected to VSS2-5.
Note 22. IBICK2-3 pins must be connected to VSS2-5.
Table 1. Input Data Synchronous/Asynchronous Mode Setting
■ Audio Interface Format for Input PORT
The audio data format of input port is MSB first, 2’s complement format. The SDTI1, SDTI2 and SDTI3 are latched on the
rising edge of IBICK1, IBICK2 and IBICK3 respectively.
In parallel control mode (SPB pin= “L”), IDIF2-0 pins control all audio interface formats of SRC1~3. IDIF2-0 pins must be
set during the PDN pin= “L”.
In serial control mode (SPB pin = “H”), setting of IDIF2-0 pins is ignored. IDIF[12:10] bits setting is reflected to SRC1,
IDIF[22:20] bits setting is reflected to SRC2, and IDIF[32:30] bits setting is reflected to SRC3.
IDIF[12:10] bits should be changed after all SDTO1 output codes become zero during soft mute by SMUTE1 bit = “1” or
the SMUTE pin = “H”. IDIF[22:20] bits should be changed after all SDTO2 output codes become zero during soft mute by
SMUTE2 bit = “1” or the SMUTE pin = “H”. IDIF[32:30] bits should be changed after all SDTO3 output codes become
zero during soft mute by SMUTE3 bit = “1” or the SMUTE pin = “H”.
TDM mode (Mode 5/6) can be set in Synchronous Inputs mode (INAS pin = “L”). Serial data for 6channels should be input
from the SDTI1 pin. In this mode, connect SDTI2-3 pins to VDD2-5 because there pins are ignored.
Asynchronous Inputs mode (INAS pin = “H”) does not support TDM mode. The AK4129 is not able to operate correctly
because of SDTI1-3 data inputs are incorrect. TDM mode is must be OFF, when using the AK4129 in asynchronous inputs
mode (INAS pin = “H”). The maximum input frequency of IBICK1-3 is 256FSI.
MS1173-E-01
2010/09
- 20 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
