LC89075W-H SANYO [Sanyo Semicon Device], LC89075W-H Datasheet - Page 18

• Manufacturer Part Number: LC89075W-H
• Description: Digital Audio Interface Receiver with Stereo ADC and Audio Selector
• Manufacturer: SANYO [Sanyo Semicon Device]

9.1.4 Power-down Mode
• The ADC is set to power-down mode by “ADCOPR[1:0]=11”. In power-down mode, VREF is set to the AGND
• Power-on reset when turning the power on and system start-up from power-down mode are both executed via the
• The ADC advances the reset cancel when initialization is complete. Normally, 16384/fs period needs for the reset
• DATAOUT outputs data “0” during power-down mode and reset cancel period.
• The ADC starts analog to digital conversion after reset is canceled. The digital data is output after fade-in processing
• In cases such as when slave mode or an oscillation module is not used and an external clock is supplied instead, the
9.1.5 When Not Using the ADC
• When not using the built-in ADC, 3.3V can be supplied to the AV DD pin that normally requires a 5V supply.
• The ADC can operate even when 3.3V is supplied, but the characteristics are not guaranteed. Therefore, it is
voltage.
ADC initialization cycle. Reset by power-on-reset or ADC initialization after power-down mode is canceled require a
period of 85ms.
cancel. The offset generated in initial data of ADC is removed for this period. When the reset cancel period dose not
need, it sets by the ADBMOD register. (“ADBMOD=1”)
by the digital volume. In addition, switching from normal operation to power-down mode is executed after fade-out
processing.
clock may be disrupted when switching to power-down mode, and noise may be generated. In these cases, set power-
down mode after performing soft mute processing. See below for further details, “9.5 Soft Mute/Attenuator”.
recommended to set the power-down mode when not using the ADC.
ADCOPR[1:0]
Power-Down
ADC State
LRCKOUT
DATAOUT
(Internal)
DV DD
PV DD
AV DD
VREF
Figure 9.1 Timing Chart for Power-down Mode and When the Mode is Canceled
Indefinite
0 data
Reset cancel
Initialize
85ms
“ ADCOPR[1:0]=00 ”
“ ADBMOD=0 ”
“ ADBMOD=1 ”
∼
16384/fs
1/2AV DD
0ms
Operation
LC89075W-H
Fade in
∼
Set
“ ADCOPR[1:0]=11 ”
Fade out
Power-down
∼
Cancel
0 data
Initialize
85ms
“ ADCOPR[1:0]=00 ”
“ ADBMOD=0 ”
“ ADBMOD=1 ”
∼
16384/fs
1/2AV DD
Operation
0ms
Fade in
∼
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