92HD81B1C5NLGXYDX8 IDT, Integrated Device Technology Inc, 92HD81B1C5NLGXYDX8 Datasheet - Page 33

• Manufacturer Part Number: 92HD81B1C5NLGXYDX8
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 92HD81B1C5NLGXYDX8

• Lead Free Status / RoHS Status: Compliant

92HD81
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
IDT™ CONFIDENTIAL
2.18. BTL Amplifier
Headphone
SD/Mute
Internal
Amp
CODEC
An integrated class-AB stereo BTL amplifier is provided to directly drive 4 ohm speakers (2W @
4.75V) or 8 ohm speakers (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 pre-
vents unintentional power consumption when pausing audio playback. The amplifier may be con-
trolled using the EAPD pin (see EAPD section.)
Using a vendor specific verb, the BTL amplifier may be configured to support a mono speaker con-
nected to the L +/- pins. In this mode, the Left and Right audio is mixed and sent to the left output
only. The right channel is turned off to conserve power.
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
SYNC FROM KBC TO OS
SCAN
CODES
SMU MUTE
KBC
VDD
33
SYNC FROM AUDIO GUI TO KBC
A_EAPD
A_SD
SPKR_EN#
GPIO_1
SPKR AMP
OTHER
CODEC
OS
SD#
Power Amp
External
V 0.987 11/09
92HD81