AK4129 Datasheet, PDF (30/50 Pages) Asahi Kasei Microsystems – 6ch 216kHz / 24-Bit Asynchronous SRC

[AK4129]
■ 6/4channel Mode
The AK4129 has AK4126 compatible 6-channel mode, AK4129 original 6-channel mode and 4-channel modes. When the
PM2/1 pins are set to “L/L”, the AK4129 becomes AK4126 compatible 6-channel mode and six channels (SDTI1Æ
SDTO1, SDTI2 Æ SDTO2 and SDTI3 Æ SDTO3) are powered up. When the PM2/1 pins are set to “L/H”, the AK4129
becomes 4-channel mode and four channels (SDTI1Æ SDTO1 and SDTI2 Æ SDTO2) are powered up, and the other two
channels (SDTI3 Æ SDTO3) are powered down (“L” output). When the PM2/1 pins are set to “H/L”, the AK4129
becomes original 6-channel mode and six channels (SDTI1Æ SDTO1, SDTI2 Æ SDTO2 and SDTI3 Æ SDTO3) are
powered up. In AK4126 compatible 6-channel mode and 4-channel mode, the X’tal oscillator circuit and the MCKO output
are powered down and the XTO pin and MCKO pin output Hi-z.
PM2 PM1 PDN
pin pin pin
Mode
X’tal Oscillator
XTI pin
XTO
pin
MCKO
pin
L
L
L
L
L
H
6-channel mode
(AK4126 compatible)
Power-down ^{Pull down to VSS2-5 (note)} Hi-z
Input
Hi-z
L HL
L HH
4-channel mode
Power-down
Pull down to VSS2-5 (note)
Input
Hi-z
H LL
H LH
6-channel mode
(Original mode)
Power-down
Normal
operation
Pull down to VSS2-5 (note) Hi-z
Input
Output
L
Normal
operation
H HL
Not available
-
H HH
-
-
-
-
-
-
-
Note: Pull down (460kΩ typ.) to VSS2-5.
Table 8. Channel Mode Setting
■ Soft Mute Operation
1. Manual Mode
The soft mute operation is performed in the digital domain of the SRC output. SRC1-3 soft mutes are controlled together by
the SMUTE pin in parallel control mode (SPB pin = “L”). In serial control mode (SPB pin = “H”), setting of the SMUTE
pin is ignored. SRC1 reflects SMUTE1 bit setting, SRC2 reflects SMUTE2 bit setting, and SRC3 reflects SMUTE3 bit
setting.
When the SMUTE pin goes “H” or SMUTE1-3 bits becomes “1”, all the outputs data are attenuated by −∞ during 1024
OLRCK cycles (@ SMT1 pin = “L” and SMT0 pin = “L”). When the SMUTE pin goes “L” or SMUTE1-3 bits becomes
“0”the mute is cancelled and the output attenuation gradually changes to 0dB during 1024 OLRCK cycles (@ SMT1 pin =
“L” and SMT0 pin = “L”). If the soft mute is cancelled before attenuating to -∞, the attenuation is discontinued and
returned to 0dB by the same cycles. The soft mute is effective for changing the signal source without stopping the signal
transmission. Soft mute cycle is set by SMT1-0 pins. SMT1-0 pins must not be changed during soft mute transition.
SMT1pin
L
L
H
H
SMT0 pin
Period FSO=48kHz FSO=96kHz
L
1024/fso
21.3ms
10.7ms
H
2048/fso
42.7ms
21.3ms
L
4096/fso
85.3ms
42.7ms
H
8192/fso
170.7ms
85.3ms
Table 9. Soft Mute Cycle Setting (Parallel Mode)
FSO=192kHz
5.3ms
10.7ms
21.3ms
42.7ms
MS1173-E-02
- 30 -
2011/06