AK4129 AKM [Asahi Kasei Microsystems], AK4129 Datasheet - Page 30

• Manufacturer Part Number: AK4129
• Description: 6ch 216kHz / 24-Bit Asynchronous SRC
• Manufacturer: AKM [Asahi Kasei Microsystems]

■
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 (SDTI1
SDTO1, SDTI2
becomes 4-channel mode and four channels (SDTI1
channels (SDTI3
becomes original 6-channel mode and six channels (SDTI1
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.
■
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.
MS1173-E-01
PM2
6/4channel Mode
Soft Mute Operation
pin
H
H
H
H
L
L
L
L
PM1
pin
H
H
H
H
L
L
L
L
SMT1pin
PDN
pin
H
H
L
H
L
H
L
L
SDTO2 and SDTI3
H
H
L
L
SDTO3) are powered down (“L” output). When the PM2/1 pins are set to “H/L”, the AK4129
(
AK4126 compatible
6-channel mode
4-channel mode
6-channel mode
(Original mode)
Not available
SMT0 pin
Mode
H
H
L
L
Table 9. Soft Mute Cycle Setting (Parallel Mode)
SDTO3) are powered up. When the PM2/1 pins are set to “L/H”, the AK4129
)
Table 8. Channel Mode Setting
1024/fso
2048/fso
4096/fso
8192/fso
Period
X’tal Oscillator
Power-down
Power-down
Power-down
operation
Normal
SDTO1 and SDTI2
-
-
- 30 -
FSO=48kHz
SDTO1, SDTI2
170.7ms
21.3ms
42.7ms
85.3ms
Pull down to VSS2-5 (note)
Pull down to VSS2-5 (note)
Pull down to VSS2-5 (note)
FSO=96kHz
SDTO2) are powered up, and the other two
XTI pin
Note: Pull down (460kΩ typ.) to VSS2-5.
Input
Input
Input
10.7ms
21.3ms
42.7ms
85.3ms
SDTO2 and SDTI3
-
-
FSO=192kHz
10.7ms
21.3ms
42.7ms
5.3ms
Output
XTO
Hi-z
Hi-z
Hi-z
pin
-
-
SDTO3) are
operation
[AK4129]
Normal
MCKO
Hi-z
2010/09
pin
L
-
-