dac3555a Micronas, dac3555a Datasheet - Page 11

• Manufacturer Part Number: dac3555a
• Description: Stereo Audio Dac
• Manufacturer: Micronas

PRELIMINARY DATA SHEET
2.14. Power Modes
The DAC 3555A supports four different power modes,
which can be selected by I
1. Zero Power
This is the default mode after power up. In this mode
digital and analog blocks are inactive.
Please note that minimum power consumption is only
achieved if all digital input pins connected to peripheral
circuits are low or tristate.
2. Analog Stand-by
This mode activates the internal analog reference sys-
tem and allows a fast and quiet transition to the active
modes below.
3. Aux to Line
This active mode is used, if no digital audio signals are
present. Only the analog back-end is active.
4. Full Power
All blocks are active in this mode.
Start-up sequence: The recommended sequence for
stepping through the power modes is shown in Section
4.5. “Power-up/down Sequence” on page 30.
Micronas
2
C.
2.15. Oscillator
The I
Registers” on page 18) switches on in the following
modes, only:
1. DAC ON - Standard Mode - automatic sample rate
detection
2. DAC ON - MPEG Mode
In all other modes the oscillator is not required inter-
nally and therefore switched off.
For test purpose it is possible to switch on the oscilla-
tor in all modes (control register AVOL, bit 15). It is not
recommended to use this option in normal applica-
tions.
2
C-controlled oscillator (see Section 3.5. “Control
DAC 3555A
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