92hd88b4x5ndg Integrated Device Technology, 92hd88b4x5ndg Datasheet - Page 33

• Manufacturer Part Number: 92hd88b4x5ndg
• Description: Single Chip Pc Audio System Codec+mono Speaker Amplifier+capless Hp+ldo
• Manufacturer: Integrated Device Technology

IDT PROPRIETARY / IDT
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
92HD88
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
2.18. BTL Amplifier
Headphone
SD/Mute
Internal
Amp
CODEC
CONFIDENTIAL
An integrated class-AB mono BTL amplifier is provided to directly drive 4 ohm speaker (2W @
4.75V) or 8 ohm speaker (1W @ 4.75V). No external filter is needed for cable runs of 18” or less. An
internal DC blocking filter prevents distortion when the audio source has DC content, and prevents
unintentional power consumption when pausing audio playback. The amplifier may be controlled
using the EAPD pin (see EAPD section.)
Figure 8. HP EAPD Example to be replaced by single pin for internal amp
Internal BTL
EAPD PIN
SD/Mute
Control
Amp
(MUTE LED ON
SAME BOARD)
UP/DOWN
BUTTONS
MUTE +
EAPD
HP AUDIO CONTROL BLOCK DIAGRAM
SCAN
CODES
SYNC FROM KBC TO OS
SMU MUTE
KBC
VDD
33
SYNC FROM AUDIO GUI TO KBC
A_EAPD
A_SD
SPKR_EN#
GPIO_1
SPKR AMP
OTHER
CODEC
OS
92HD88
SD#
Power Amp
External
PC AUDIO
V 0.94 07/11