ak4620b AKM Semiconductor, Inc., ak4620b Datasheet - Page 26

• Manufacturer Part Number: ak4620b
• Description: 24-bit 192khz Audio Codec With Ipga
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
The ADC and DAC of AK4620B are placed in power-down mode by bringing the PDN pin = “L”. Each digital filter is
also reset at the same time. The internal register values are initialized by bringing PDN pin to “L”. This reset should
always be done after power-up. As both control registers of the ADC and the DAC go to the reset state (RSTAD bit =
RSTDA bit = “0”), each register should be cleared after performing the reset. In the case of the ADC, an analog
initialization cycle starts after exiting the power-down or reset state. The output data (SDTO) is available after 516 cycles
of LRCK clock. This initialization cycle does not affect the DAC operation. Power down mode can be also controlled by
the registers (PWAD bit, PWDA bit).
MS0401-E-00
Power Down & Reset
Pow er Supply
PDN pin
RSTAD(register)
RSTDA(register)
PWAD(register)
PWDA(register)
PWVR(register)
ADC Internal State
IATT
SDTO
DAC Internal State
OATT
AOUT
External Mute
Example
External clocks
• INITA:
• PD:
• XXH, YYH: The current value in ATT registers.
• FI:
• FADE:
• AOUT: Some pop noise may occur at “*”.
Initializing period of ADC analog section (516/fs).
Power down state. The contents of all registers are held.
Fade in. After exiting power down and reset state, ATT value fades in.
After exiting power down and reset state, ATT value fades in/out.
(1) When RSTDA is “L” and OATT value is written to “XXH”, OATT value changes from FFH
(2) When PWDA is “L” and OATT value is written to “YYH”, OATT value changes from XXH
to XXH according to fade operation.
to YYH according to fade operation.
Hi-z
FFH
PD Reset INITA
PD
Figure 11. Reset & Power down sequence in serial mode
*
00H
“0”
The clocks can be stopped.
VCOM
Reset
FFH (1)
00H → XXH
MCLK, LRCK, BICK
FI
*
FFH → XXH
Normal
FADE
- 26 -
Output
XXH
Normal
PD
00H 00H → XXH
Output
XXH
“0”
INITA
FI
*
XXH(2 )
Hi-z
Normal
XXH
Output
PD
*
XXH → YYH YYH
Normal
FADE
[AK4620B]
2005/07