92HD87B2X5NDGXTBX IDT, Integrated Device Technology Inc, 92HD87B2X5NDGXTBX Datasheet - Page 28

• Manufacturer Part Number: 92HD87B2X5NDGXTBX
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 92HD87B2X5NDGXTBX

• Lead Free Status / RoHS Status: Compliant

IDT PROPRIETARY / IDT
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
92HD87
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
2.20. Digital Core Voltage Regulator
2.21. Aux Audio Support
CONFIDENTIAL
The digital core operates from 1.4 to 1.98V making it compatible with 1.5V (5%) and 1.8V (10%) sup-
ply voltages. Many systems require that the CODEC use a single 3.3V digital supply, so an inte-
grated regulator is included on die. The regulator uses pin 7, 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. 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 application 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.
To prevent pops, software is expected to mute paths as close to the port as is possible when chang-
ing power states or signal topology.
The codec supports an auxiliary audio mode where analog audio is supported by default after power
is supplied with the HD Audio bus disabled. In this mode, an analog input is routed to one of several
output ports depending on jack presence detection.
In addition to shutting off the CODEC BTL and headphone amplifiers when the docked device output
jack is used, the BTL amplifier will be disabled when the headphone jacks are used, and the head-
phone amplifiers will be disabled when not in use.
28
92HD87
PC AUDIO
V 0.95 10/10