92hd81 Integrated Device Technology, 92hd81 Datasheet - Page 19

• Manufacturer Part Number: 92hd81
• Description: Single Chip Pc Audio System
• Manufacturer: Integrated Device Technology

SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
92HD81
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
2.6.
2.7.
2.8.
1.
2.
3.
4.
5.
AFG D0
AFG D1
AFG D2
Reference Bias generator
Reference Bandgap core
No DAC or ADC streams are active. Analog mixing and loop thru are supported.
VAG is kept active when ports are disabled or in D3/D3cold/D4. PC_Beep is supported in D3 but may be attenuated and
distorted depending on load impedance.
VAG is always ramped up and down gradually, except in the case of a sudden power removal. VAG is active in D2/D3 but
in a low power state.
Not active if BITCLK is not running (Controller in D3), but can signal power state change request (PME)
Both AVDD and DVDD must be available for Port Sense to operate.
Capless HP Amps
Analog PC_Beep
Digital PC_Beep
HD Audio-Link
Lo/HP Amps
Port Sense
VAG amp
BTL Amp
Function
The D3-default state is available for HD Audio compliance. The programmable values, exposed via
vendor-specific settings, are under IDT Device Driver control for further power reduction. The analog
mixer, line and headphone amps, port presence detect, and internal references may be disabled
using vendor specific verbs. Use of these vendor specific verbs will cause pops.
The default power state for the Audio Function Group after reset is D3.
The AFG D0 state is the active state for the device. All functions are active if their power state (if they
support power management at their node level) has been set to D0.
D1 is a lower power mode where all converter widgets are disabled. Analog mixer and port functions
are active. The part will resume from theD1 to theD0 state within 1 mS.
The D2 state further reduces power by disabling the mixer and port functions. The port amplifiers
and internal references remain active to keep port coupling caps charged and the system ready for a
quick resume to either the D1 or D0 state. The part will resume from the D2 state to the D0 state
within 2mS.
On
On
On
On
On
On
On
On
D0
On
On
Table 5. Power Management
D1
On
On
On
On
On
On
On
On
On
On
1
19
On
On
On
On
On
On
On
On
D2
On
On
Low Drive
Low Drive
Low Drive
Low Drive
On
On
On
On
On
D3
On
5
4
5
2
2
2
3
Low Drive
Low Drive
Low Drive
92HD81
Limited
D3cold
Off
Off
On
On
Off
Off
2
2
Specific D4
Low Drive
Low Drive
Low Drive
Vendor
Off
Off
On
On
Off
Off
Off
2
2
PC AUDIO
SpecificD5
V 0.97 01/09
Vendor
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off