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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

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Global Mixed-mode Technology Inc.
G1428
Absolute Maximum Ratings
Supply Voltage, VCC…………………..…...…….……...6V
Operating Ambient Temperature Range
TA…….…………………………….……….-40°C to +85°C
Maximum Junction Temperature, TJ…..……….….150°C
Storage Temperature Range, TSTG….…-65°C to+150°C
Reflow Temperature (soldering, 10sec)….……..260°C
Power Dissipation (1)
TA 25°C …...…….….…………….….………..2.7W
TA 70°C …………….………………..………..1.7W
Electrostatic Discharge, VESD
Human body mode..………………………………3000(2)
Note:
(1) : Recommended PCB Layout
(2) : Human body model : C = 100pF, R = 1500Ω, 3 positive pulses plus 3 negative pulses
www.DataSheetE4Ul.ecocmtrical Characteristics
DC Electrical Characteristics, TA=+25°C
PARAMETER
Supply voltage VDD
High-Level Input voltage, VIH
Low-Level Input voltage, VIL
DC Differential Output Voltage
Supply Current in Mute Mode
IDD in Shutdown
SYMBOL
CONDITION
VDD
VIH SE/ BTL , HP/ LINE , SHUTDOWN , GAIN0 ,
GAIN1
VIL SE/ BTL , HP/ LINE , SHUTDOWN , GAIN0,
GAIN1
VO(DIFF)
IDD
VDD = 5V,Gain = 2
VDD = 5V
Stereo BTL
Stereo SE
ISD VDD = 5V
MIN
4.5
3.5
---
---
---
---
TYP
5
---
MAX
5.5
---
UNIT
V
V
--- 1 V
5 50 mV
7.5 13 mA
47
160 300
µA
(AC Operation Characteristics, VDD = 5.0V, TA=+25°C, RL = 4Ω, unless otherwise noted)
PARAMETER
SYMBOL
CONDITION
Output power (each channel) see Note
Total harmonic distortion plus noise
Maximum output power bandwidth
P(OUT)
THD+N
BOM
THD = 1%, BTL, RL = 4Ω G=-2V/V
THD = 1%, BTL, RL = 8Ω G=-2V/V
THD = 10%, BTL, RL = 4Ω G=-2V/V
THD = 10%, BTL, RL = 8Ω G=-2V/V
THD = 0.1%, SE, RL = 32Ω
PO = 1.6W, BTL, RL = 4Ω G=-2V/V
PO = 1W, BTL, RL = 8Ω G=-2V/V
PO = 75mW, SE, RL = 32Ω
VI = 1V, RL = 10KΩ, SE
THD = 5%
Power supply ripple rejection
Channel-to-channel output separation
PSRR
F=1kHz, BTL mode G=-2V/V
CBYP=1µF
f = 1kHz
Line/HP input separation
BTL attenuation in SE mode
Input impedance
ZI
Signal-to-noise ratio
Output noise voltage
PO = 500mW, BTL, G=-2V/V
Vn BTL, G=-2V/V, A Weighted filter
Note :Output power is measured at the output terminals of the IC at 1kHz.
MIN
---
---
---
---
---
---
---
---
---
---
---
TYP
2
1.25
2.5
1.6
85
100
60
80
30
>15
68
MAX
---
---
---
---
---
---
---
---
---
---
---
UNIT
W
mW
m%
kHz
dB
--- 80 ---
--- 80 ---
--- 85 ---
See Table 2
--- 90 ---
--- 45 ---
dB
dB
dB
MΩ
dB
µV (rms)
Ver: 1.2
Mar 31, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
2

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Global Mixed-mode Technology Inc.
Typical Characteristics
Table of Graphs
G1428
THD +N Total harmonic distortion plus noise
Output noise voltage
Vn Supply ripple rejection ratio
Crosstalk
PO Output power
PD Power dissipation
www.DataSheet4U.com
vs Frequency
vs Output Power
vs Output Voltage
vs Frequency
vs Frequency
vs Frequency
vs Load Resistance
vs Output Power
FIGURE
1,2,7,8,13,14,19,21
3,4,5,6,9,10,11,12,15,16,17,18,20
22
27
23,24
25,26
28,29
30,31
10
5
2
1
0.5
%
0.2
0.1
0.05
Toal Harmonic Distortion Plus
Noise vs Frequency
VDD=5V
RL=3Ω
BTL
Po=1.75W
Av=-24V/V
Av=-2V/V
0.02 Av=-6V/V
0.01
20
50 100
Av=-12V/V
20 0
5 00 1k
2k
Hz
Figure 1
5k 10k 20 k
Toal Harmonic Distortion Plus
Noise vs Frequency
10
5 VDD=5V
RL=3Ω
2 BTL,Av=-2V/V
1
0.5
%
0.2
Po=1W
0.1
Po=0.5W
0.05
0.02
0.01
20
Po=1.75W
50 100 20 0
5 00
Hz
1k
2k
Figure 2
5k 10k 20 k
Toal Harmonic Distortion Plus
Noise vs Output Power
10
5
2
1
0.5
%
0.2
15kHz
VDD=5V
RL=3Ω
BTL,Av=-2V/V
1kHz
0.1
0.05 20Hz
0.02
0.01
3m 5m 10m 20m
50 m
100m
W
200 m
Figure 3
50 0m
1
23
Toal Harmonic Distortion Plus
Noise vs Output Power
10
5 15kHz
2
1
0.5
%
0.2
1kHz
0.1
VDD=5V
0.05 RL=3Ω
BTL,Av=-6V/V
0.02
20Hz
0.01
3m 5m
10m 20m
50 m
100m
W
200 m
Figure 4
50 0m
1
23
Ver: 1.2
Mar 31, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
3