AK4129 AKM [Asahi Kasei Microsystems], AK4129 Datasheet - Page 33

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

■
The AK4129 has an internal regulator which suppresses the voltage to 1.8V from DVDD1-4. The generated 1.8V power is
used as power supply for internal circuit. When over-current is flowed to the regulator output, over-current detection circuit
works. When over-voltage is flowed to the regulator output, over-voltage detection circuit works. The regulator block is
powered-down and the AK4129 becomes reset state when over-current detection circuit or over-voltage detection circuit is
operated. The AK4129 does not return to normal operation without a reset by the PDN pin when these detection circuits are
worked. When over-current or over-voltage is detected, the PDN pin should be brought into “L” at once, and should be set
to “H” again to recover normal operation.
The UNLOCK pin indicate the internal status of the device, and outputs “L” in SRC normal operation, and outputs “H”
when over-current or over-voltage are detected.
■
Bringing the PDN pin = “L” sets the AK4129 power-down mode and initializes the digital filters. The AK4129 should be
reset once by bringing the PDN pin = “L” upon power-up. When PDN pin = “L”, the SDTO1-3 output is “L”. It takes 23ms
(max) for SDTO output enable after power-down state is released by a clock input. Until then, the SDTO1-3 outputs “L”.
The internal SRC circuit is powered-up on an edge of ILRCK1-3 after a power-up time period of the internal regulator.
(SDTO is identified as SDTO1, SDTO2 and SDTO3. SDTI is identified as SDTI1, SDTI2 and SDTI3.)
MS1173-E-01
System Reset
Regulator
Case 1
External clocks
(Internal state)
External clocks
SDTI
SDTO3
SDTO2
SDTO1
PDN
UNLOCK
(Input port)
(Output port)
Power-down
Don’t care
Don’t care
Don’t care
“0” data
“0” data
“0” data
23ms(max)
(1)
Figure 34. System Reset 1
Output Clocks 1
Input Clocks 1
Input Data 1
Normal data
Normal data
Normal data
Normal
- 33 -
operation
PD
“0” data
“0” data
“0” data
23ms(max)
Output Clocks 2
(1)
Input Clocks 2
Input Data 2
Normal data
Normal data
Normal data
Normal
operation
Power-down
Don’t care
Don’t care
Don’t care
“0” data
“0” data
“0” data
[AK4129]
2010/09