AK4128A Datasheet, PDF (25/50 Pages) Asahi Kasei Microsystems – 8ch 216kHz / 24-Bit Asynchronous SRC

[AK4128A]
(3) SRC Bypass Mode
SRC bypass mode can be set in Synchronous inputs mode (INAS pin = “L”). Asynchronous inputs mode (INAS pin = “H”)
does not supports SRC bypass mode, so that the data is not transferred correctly on SDTI1→SDTO1, SDTI2→SDTO2,
SDTI3→SDTO3 and SDTI4→SDTO4 lines. In Asynchronous inputs mode (INAS pin = “H”), the AK4128A should be
used in SRC mode.
When the AK4128A is in slave mode, SDTI1-4 data are input by the ILRCK1 and IBICK1 clocks in SRC bypass mode
(Table 2). The SDTI1-4 data are output from the OLRCK and OBICK pins in a format shown in Table 6 and Table 7.
IBICK and OBICK must be synchronized but the phase is not critical. ILRCK and OLRCK must be synchronized but the
phase is not critical.
IBICK1
ILRCK1
SDTI1
IBICK2
ILRCK2
SDTI2
IBICK3
ILRCK3
SDTI3
Input
Serial
Audio
I/F
DEM
FIR
Bypass
SRC1
SRC
SRC
SMUTE
+
Dither _{0.5 LSB}
Bypass
SRC2
Input
Serial
Audio
DEM
FIR
SRC
SRC
SMUTE
+
I/F
Dither _{0.5 LSB}
Output
Serial
Audio
I/F
Input
Serial
Audio
I/F
DEM
FIR
Bypass
SRC3
SRC
SRC
SMUTE
+
Dither _{0.5 LSB}
OLRCK
OBICK
SDTO1
OBIT1
OBIT2
ODIF1
ODIF0
SDTO2
SDTO3
IBICK4
ILRCK4
SDTI4
IMCLK
PDN
PM1
PM2
Input
Serial
Audio
I/F
uP
I/F
DEM
FIR
Internal
OSC
Bypass
SRC4
SRC
SRC
SMUTE
+
Dither _{0.5 LSB}
Bypass
X’tal
Clock
Osc
Div
SRC
Internal
Regulator
REF
CAD0 SDA SCL XTO OMCLK/XTI ^{CM2 CM1 CM0}
SPB
VD18
SDTO4
UNLOCK
MCKO
AVDD
VSS1
Figure 23. Bypass Mode in Slave Mode (Synchronous mode INAS pin = “L”)
MS1242-E-00
- 25 -
2010/09