92HD87 Datasheet, PDF (13/204 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM

92HD87
SINGLE CHIP PC AUDIO SYSTEM, CODEC+STEREO SPEAKER AMPLIFIER+CAPLESS HP+LDO
2.2. Analog Mixer
The mixer supports independent gain (-34.5 to +12dB in 1.5dB steps) on each input as well as inde-
pendent mutes on each input. The following inputs are available:
• Port A
• Port C
• Port F
2.3. ADC Multiplexers
The codec implements 2 ADC input multiplexers. These multiplexers incorporate the ADC record
gain function (0 to +22.5dB gain in 1.5dB steps) as an output amp and allow a preselection of one of
7 possible inputs:
• Port A
• Port C
• Port F
• Mixer Output
• DMIC 0
2.4. Power Management
The HD Audio specification defines power states, power state widgets, and power state verbs.
Power management is implemented at several levels. The Audio Function Group (AFG) , all con-
verter widgets, and all pin complexes support the power state verb F05/705. Converter widgets are
active in D0 and inactive in D1-D3.
The following table describes what functionality is active in each power state.
Function
Digital Microphone inputs
DAC
D2S
ADC
ADC Volume Control
Ref ADC
Analog Clocks
GPIO pins
VrefOut Pins
Input Boost
Analog mixer
Mixer Volumes
Analog PC_Beep
Digital PC_Beep
Lo/HP Amps
Capless HP Amps
BTL Amp
VAG amp
D0
D1¹
D2
D3
D3cold
Vendor
Vendor
Specific D4 SpecificD5
On
Off
Off
Off
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
On
On
On
On⁵
On
On
Off
On
On
Off
Off
Off
Off
Off
On
On
Off
Off
Off
Off
Off
On
On
Off
Off
Off
Off
Off
On
On
Off
Off
Off
Off
Off
On
On
On
On
Off
Off
Off
On
On
On
On⁵
Off
Off
Off
On
On
On _{Low Drive}² _{Low Drive}² _{Low Drive}²
Off
On
On
On _{Low Drive}² _{Low Drive}² _{Low Drive}²
Off
On
On
On _{Low Drive}²
Off
Off
Off
On
On
On _{Low Drive}³ Low Drive Low Drive
Off
Table 3. Power Management
IDT CONFIDENTIAL
13
©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
V 0.995 01/11
92HD87