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Global Mixed-mode Technology Inc.
2W Stereo Audio Amplifier
G1422
Features
„ Depop Circuitry Integrated
„ Output Power at 1% THD+N, VDD=5V
--2W/CH (typical) into a 4Ω Load
--1.2W/CH (typical) into a 8Ω Load
„ Bridge-Tied Load (BTL), Single-Ended (SE)
„ Shutdown Control Available
„ Thermal protection
„ Surface-Mount Power Package
20-Pin TSSOP-P
www.DataSheet4U.com
Applications
„ Stereo Power Amplifiers for Notebooks or
Desktop Computers
„ Multimedia Monitors
„ Stereo Power Amplifiers for Portable Audio
Systems
General Description
The G1422 is a stereo audio power amplifier in 20pin
TSSOP thermal pad package. It can drive 2W 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, the G1422 supports the Bridge-
Tied Load (BTL) mode for driving the speakers, Sin-
gle-End (SE) mode for driving the headphone. For the
low current consumption applications, the SHDN mode
is supported to disable the G1422 when it is idle. The
current consumption can be further reduced to below
2µA.
Ordering Information
ORDER
NUMBER
G1422F2U
Note:F2: TSSOP-20 (FD)
U: Tape & Reel
ORDER NUMBER
(Pb free)
G1422F2Uf
Pin Configuration
MARKING
G1422
TEMP.
RANGE
-40°C to +85°C
PACKAGE
TSSOP-20 (FD)
SHUTDOWN 1
GND/HS 2
+OUTA 3
VDD 4
-OUTA 5
-INA 6
GND/HS 7
+INA 8
GND/HS 9
GND/HS 10
G1422
Top View
TSSOP-20 (FD)
20 HP-IN
19 GND/HS
18 +OUTB
17 VDD
16 -OUTB
15 -INB
14 BYPASS
13 +INB
12 GND/HS
11 GND/HS
Thermal
Pad
Bottom View
Note: Recommend connecting the Thermal Pad to the GND for excellent power dissipation.
Ver: 1.2
Jun 29, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
1

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Global Mixed-mode Technology Inc.
G1422
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
TA 85°C………………….………………………1.4W
Electrostatic Discharge, VESD
Human body mode..………………….…-3000 to 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, VDD = 5.0V, TA=+25°C, unless otherwise noted
PARAMETER
Supply Current
DC Differential Output Voltage
IDD in Shutdown
Headphone High Input Voltage
Headphone Low Input Voltage
SYMBOL
IDD
VO(DIFF)
ISD
VIH
VIL
CONDITION
VDD = 5V
Stereo BTL
STEREO SE
VDD = 5V,Gain = 2
VDD = 5V
MIN
---
---
---
---
4
---
TYP
8.5
4
5
0.1
---
---
MAX
15
8
50
2
---
0.8
UNIT
mA
mV
µA
V
V
(AC Operation Characteristics, VDD = 5.0V, TA=+25°C, RL = 4Ω, unless otherwise noted)
PARAMETER
SYMBOL
CONDITION
THD = 1%, BTL, RL = 4Ω
THD = 1%, BTL, RL = 8Ω
THD = 10%, BTL, RL = 4Ω
Output power (each channel) see Note
P(OUT)
THD = 10%, BTL, RL = 8Ω
THD = 1%, SE, RL = 4Ω
THD = 1%, SE, RL = 8Ω
THD = 10%, SE, RL = 4Ω
THD = 10%, SE, RL L = 8Ω
THD = 0.5%, SE, RL = 32Ω
PO = 1.6W, BTL, RL = 4Ω
Total harmonic distortion plus noise
THD+N
PO = 1W, BTL, RL = 8Ω
PO = 75mW, SE, RL = 32Ω
VI = 1V, RL = 10KΩ, G = 1, SE
Maximum output power bandwidth
BOM G = 1, THD = 1%
Phase margin
RL = 4Ω, Open Load
Power supply ripple rejection
PSRR f = 120Hz
Channel-to-channel output separation
f = 1kHz
Input separation
BTL attenuation in SE mode
Input impedance
ZI
Signal-to-noise ratio
PO = 500mW, BTL
Output noise voltage
Vn Output noise voltage
Note :Output power is measured at the output terminals of the IC at 1kHz.
MIN
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
TYP
2
1.25
2.5
1.6
550
340
700
440
92
300
100
15
2.5
20
65
75
80
80
85
2
90
55
MAX UNIT
---
---
---
W
---
---
---
--- mW
---
---
---
---
---
m%
---
--- kHz
--- °
--- dB
--- dB
--- dB
--- dB
--- MΩ
--- dB
--- µV (rms)
Ver: 1.2
Jun 29, 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
G1422
THD +N Total harmonic distortion plus noise
Output noise voltage
Vn
Supply ripple rejection ratio
Crosstalk
Open loop response
IDD Supply current
PO Output power
www.DataSheet4U.com
PD Power dissipation
vs Frequency
vs Output Power
vs Frequency
vs Frequency
vs Frequency
vs Frequency
Vs Supply Voltage
vs Load Resistance
Vs Load Resistance
vs Output Power
FIGURE
2,4,6,9,11,15,17
1,3,5,7,8,10,12,13,14,16,18
20
19
22,23
21
24
25,26
27,28
29,30,31,32
Total Harmonic Distortion Plus
Noise vs Output Power
10
5 20kHz
2
1
0.5 1kHz
%
0.2
0.1 20 Hz
0.05
0.02
VDD=5V
RL=3Ω
BTL
Av=-2V/V
0.01
3m 5m
10m 20m
50m 100m 200m
W
Figure 1
500m
1
23
Total Harmonic Distortion Plus
Noise vs Frequency
10
5
2
1
0.5
%
0.2
0.1
0.05
0.02
0.01
20
Po=1.8W
VDD=5V
RL=3Ω
BTL
Av=-2V/V
50 100 200
500 1k
Hz
2k
Figure 2
5k 10k 20k
Total Harmonic Distortion Plus
Noise vs Output Power
10
5
20kHz
2
1
0.5 1kHz
%
0.2
0.1 20 Hz
0.05
0.02
VDD=5V
RL=4Ω
BTL
Av=-2V/V
0.01
3m 5m
10m 20m
50m 100m 200m
W
Figure 3
500m
1
23
Total Harmonic Distortion Plus
Noise vs Frequency
10
5
Av=-4V/V
2
1 Av=-2V/V
0.5
%
0.2
0.1
0.05
0.02
Av=-1V/V
VDD=5V
RL=4Ω
BTL
Po=2W
0.01
20
50 100 200
500 1k
Hz
2k
Figure 4
5k 10k 20k
Ver: 1.2
Jun 29, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
3