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G1428 Datasheet

2W Stereo Audio Amplifier

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G1428 pdf
Global Mixed-mode Technology Inc.
2W Stereo Audio Amplifier
2X\6X\12X\24X Selectable Gain Settings
G1428
Features
„ Internal Gain Control, Which Eliminates Exter-
nal Gain-Setting Resistors
„ Depop Circuitry Integrated
„ Output Power at 1% THD+N, VDD=5V
--2.0W/CH (typical) into a 4Ω Load
--1.2W/CH (typical) into a 8Ω Load
„ Bridge-Tied Load (BTL), Single-Ended (SE)
www.DataSheet„4U.cSotmereo Input MUX
„ PC-Beep Input
„ Fully differential Input
„ Shutdown Control Available
„ Surface-Mount Power Package
24-Pin TSSOP-P
Applications
„ Stereo Power Amplifiers for Notebooks or
Desktop Computers
„ Multimedia Monitors
„ Stereo Power Amplifiers for Portable Audio
Systems
General Description
G1428 is a stereo audio power amplifier in 24pin
TSSOP thermal pad package. It can drive 2.0W con-
tinuous RMS power into 4Ω load per channel in
Bridge-Tied Load (BTL) mode at 5V supply voltage. Its
THD is smaller than 1% under the above operation
condition. To simplify the audio system design in the
notebook application, G1428 supports the Bridge-Tied
Load (BTL) mode for driving the speakers, Single-End
(SE) mode for driving the headphone. For the low
current consumption applications, the SHDN mode is
supported to disable G1428 when it is idle. The current
consumption can be reduced to 160µA (typically).
Amplifier gain is internally configured and controlled by
two terminals (GAIN0, GAIN1). BTL gain settings of 2,
6, 12, 24V/V are provided, while SE gain is always
configured as 1V/V for headphone driving. G1428 also
supports two input paths, that means two different
amplitude AC signals can be applied and chosen by
setting HP/ LINE pin. It enhances the hardware de-
signing flexibility.
Ordering Information
ORDER
NUMBER
G1428F31U
Note: U: Tape & Reel
(FD): Thermal Pad
ORDER NUMBER
(Pb free)
G1428F31Uf
Pin Configuration
MARKING
G1428
TEMP.
RANGE
-40°C to +85°C
PACKAGE
TSSOP-24 (FD)
GND/HS 1
GAIN0 2
GAIN1 3
LOUT+ 4
LLINEIN 5
LPHIN 6
PVDD 7
RIN 8
LOUT- 9
LIN 10
BYPASS 11
GND/HS 12
Top View
TSSOP-24
24 GND/HS
23 RLINEIN
22 SHUTDOWN
21 ROUT+
20 RHPIN
19 VDD
18 PVDD
17 HP/LINE
16 ROUT-
15 SE/BTL
14 PC-BEEP
13 GND/HS
Ver: 1.2
Mar 31, 2005
1
Thermal
Pad
14
Bottom View
TEL: 886-3-5788833
http://www.gmt.com.tw
Global Mixed-mode Technology
Global Mixed-mode Technology



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