AK4497 Datasheet, PDF (42/98 Pages) Asahi Kasei Microsystems – Quality Oriented 32-Bit 2ch DAC

[AK4497]
■ Power ON/OFF Sequence in FS Auto Detect Mode (LDOE pin = “H”)
Power
PDN pin
(1)
DVDD pin
Internal PDN
(2)
Internal
State
Normal Operation (Register Write and DAC Operation are Available)
AFSD bit
Internal OSC
Clock In
LRCK
Don’t care
Internal FS Auto Detect Circuit
AFSD bit = “0”
AFSD bit = “1”
(3)
Power up
AFSD bit = “0”
(4)
FS Auto Detect mode Enable
Note:
(1) Power-up AVDD and TVDD and the PDN pin should be “L” for more than 150ns.
(2) The internal LOD is powered up upon power-up of the AK4497 if the LDOE pin= “H”. The internal
circuit will be powered up in 2ms (max.) after the shutdown switch is ON following internal
oscillator count up. When LDOE pin = “L”, shutdown switch is ON after the AK4497 is powered
up. The internal circuit will be powered up in 1us (max.)
(3) The internal oscillator starts operation by setting AFSD bit= “1”. It takes 10us (max.) until the
internal oscillator is stabilized.
(4) FS auto detect mode starts in 8/fs ~ 9/fs after setting AFSD bit= “1”.
(5) FS auto detect mode ends by setting AFSD bit = “0” and the internal oscillator will stop operation.
Figure 21. Power-down/up Sequence in FS AutoDetect Mode
Rev. 0.1
- 42 -
2015/11