92hd90 Integrated Device Technology, 92hd90 Datasheet - Page 36

• Manufacturer Part Number: 92hd90
• Description: Single Chip Pc Audio System Codec+speaker Amplifier+capless Hp+ldo+i2s
• Manufacturer: Integrated Device Technology

92HD90
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
IDT CONFIDENTIAL
©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
2.25. Digital Core Voltage Regulator
3. Fast resume times from low power states: 1ms D1 to D0, 2ms D2 to D0, 10mS D3 to D0.
4. Notification if persistent register settings have been unexpectedly reset.
5. SPDIF active in D3 (required)
The digital core operates from a 1.8V (10%) supply voltage. Many systems require that the CODEC
use a single 3.3V digital supply, so an integrated regulator is included on die. The regulator uses pin
9, DVDD, as its voltage source. The output of the LDO is connected to pin 1 and the digital core. A
10uF capacitor must be placed on pin 1 for proper load regulation and regulator stability.
The digital core voltage regulator is only dependent on DVDD. DVDDIO may be either 3.3 or 1.5V
and may precede or follow DVDD in sequence. The CODEC digital logic and I/O (unless referenced
to AVDD) will operate in the absence of AVDD. DVDD and AVDD supply sequencing for the applica-
tion of power and the removal of power is neither defined nor guaranteed. It is common for desktop
systems to supply AVDD from the system standby supply and the CODEC will tolerate, indefinitely,
the condition where AVDD is active but DVDD and DVDDIO are inactive.
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92HD90