Ver: 1.2
Jun 29, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
1
G1422
Global Mixed-mode Technology Inc.
2W Stereo Audio Amplifier
Features
Depop Circuitry Integrated
Output Power at 1% THD+N, VDD=5V
--2W/CH (typical) into a 4
Load
--1.2W/CH (typical) into a 8
Load
Bridge-Tied Load (BTL), Single-Ended (SE)
Shutdown Control Available
Thermal protection
Surface-Mount Power Package
20-Pin TSSOP-P
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 4
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
2A.
Ordering Information
ORDER
NUMBER
ORDER NUMBER
(Pb free)
MARKING
TEMP.
RANGE
PACKAGE
G1422F2U G1422F2Uf G1422 -40C
to +85C
TSSOP-20 (FD)
Note:F2: TSSOP-20 (FD)
U: Tape & Reel
Pin Configuration
HP-IN
GND/HS
+OUTB
VDD
-OUTB
-INB
BYPASS
SHUTDOWN
+OUTA
VDD
-OUTA
-INA
GND/HS
+INA
GND/HS
GND/HS
G1422
TSSOP-20 (FD)
13
20
19
18
17
16
15
5
6
7
8
9
10
1
4
3
2
14
GND/HS
Top View
+INB
11
12 GND/HS
GND/HS
Thermal
Pad
Bottom View
Note: Recommend connecting the Thermal Pad to the GND for excellent power dissipation.
HP-IN
GND/HS
+OUTB
VDD
-OUTB
-INB
BYPASS
SHUTDOWN
+OUTA
VDD
-OUTA
-INA
GND/HS
+INA
GND/HS
GND/HS
G1422
TSSOP-20 (FD)
13
20
19
18
17
16
15
5
6
7
8
9
10
1
4
3
2
14
GND/HS
Top View
+INB
11
12 GND/HS
GND/HS
Thermal
Pad
Bottom View
HP-IN
GND/HS
+OUTB
VDD
-OUTB
-INB
BYPASS
SHUTDOWN
+OUTA
VDD
-OUTA
-INA
GND/HS
+INA
GND/HS
GND/HS
G1422
TSSOP-20 (FD)
13
20
19
18
17
16
15
5
6
7
8
9
10
1
4
3
2
14
GND/HS
Top View
+INB
11
12 GND/HS
GND/HS
Thermal
Pad
Bottom View
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
2
G1422
Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
Supply Voltage, V
CC
.............................................6V
Operating Ambient Temperature Range
T
A
...................................................-40C to +85C
Maximum Junction Temperature, T
J
...................150C
Storage Temperature Range, T
STG
.......-65C to+150C
Reflow Temperature (soldering, 10sec)............260C
Power Dissipation
(1)
T
A
25C.................................................2.7W
T
A
70C.................................................1.7W
T
A
85C.................................................1.4W
Electrostatic Discharge, V
ESD
Human body mode...........................-3000 to 3000
(2)
Note:
(1)
: Recommended PCB Layout
(2)
: Human body model : C = 100pF, R = 1500
, 3 positive pulses plus 3 negative pulses
Electrical Characteristics
DC Electrical Characteristics, V
DD
= 5.0V, T
A
=+25C, unless otherwise noted
PARAMETER SYMBOL
CONDITION
MIN
TYP
MAX
UNIT
Stereo BTL
---
8.5
15
Supply Current
I
DD
V
DD
= 5V
STEREO SE
---
4
8
mA
DC Differential Output Voltage
V
O(DIFF)
V
DD
= 5V,Gain = 2
---
5
50
mV
I
DD
in Shutdown
I
SD
V
DD
= 5V
---
0.1
2
A
Headphone High Input Voltage
V
IH
4 --- --- V
Headphone Low Input Voltage
V
IL
--- --- 0.8 V
(AC Operation Characteristics, V
DD
= 5.0V, T
A
=+25C, R
L
= 4
, unless otherwise noted)
PARAMETER SYMBOL
CONDITION
MIN
TYP
MAX
UNIT
THD = 1%, BTL, R
L
= 4
--- 2 ---
THD = 1%, BTL, R
L
= 8
--- 1.25 ---
THD = 10%, BTL, R
L
= 4
--- 2.5 ---
THD = 10%, BTL, R
L
= 8
--- 1.6 ---
W
THD = 1%, SE, R
L
= 4
--- 550 ---
THD = 1%, SE, R
L
= 8
--- 340 ---
THD = 10%, SE, R
L
= 4
--- 700 ---
THD = 10%, SE, R
L
L = 8
--- 440 ---
Output power (each channel) see Note
P
(OUT)
THD = 0.5%, SE, R
L
= 32
--- 92 ---
mW
P
O
= 1.6W, BTL, R
L
= 4
--- 300 ---
P
O
= 1W, BTL, R
L
= 8
--- 100 ---
P
O
= 75mW, SE, R
L
= 32
--- 15 ---
Total harmonic distortion plus noise
THD+N
V
I
= 1V, RL = 10K
, G = 1, SE
--- 2.5 ---
m%
Maximum output power bandwidth
B
OM
G = 1, THD = 1%
---
20
---
kHz
Phase margin
R
L
= 4
, Open Load
--- 65 ---
Power supply ripple rejection
PSRR
f = 120Hz
---
75
---
dB
Channel-to-channel output separation
f = 1kHz
---
80
---
dB
Input
separation
--- 80 --- dB
BTL attenuation in SE mode
---
85
---
dB
Input impedance
ZI
---
2
---
M
Signal-to-noise ratio
P
O
= 500mW, BTL
---
90
---
dB
Output noise voltage
V
n
Output noise voltage
---
55
---
V (rms)
Note :Output power is measured at the output terminals of the IC at 1kHz.
Ver: 1.2
Jun 29, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
3
G1422
Global Mixed-mode Technology Inc.
Typical Characteristics
Table of Graphs
FIGURE
vs Frequency
2,4,6,9,11,15,17
THD +N Total harmonic distortion plus noise
vs Output Power
1,3,5,7,8,10,12,13,14,16,18
Output noise voltage
vs Frequency
20
Supply ripple rejection ratio
vs Frequency
19
Crosstalk vs
Frequency
22,23
V
n
Open loop response
vs Frequency
21
I
DD
Supply current
Vs Supply Voltage
24
vs Load Resistance
25,26
P
O
Output
power
Vs Load Resistance
27,28
P
D
Power dissipation
vs Output Power
29,30,31,32
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
%
3m
3
5m
10m
20m
50m
100m
200m
500m
1
2
W
VDD=5V
RL=3
BTL
Av=-2V/V
1kHz
20kHz
20 Hz
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
%
20
20k
50
100
200
500
1k
2k
5k
10k
Hz
Po=1.8W
VDD=5V
RL=3
BTL
Av=-2V/V
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
%
3m
3
5m
10m
20m
50m
100m
200m
500m
1
2
W
VDD=5V
RL=4
BTL
Av=-2V/V
1kHz
20 Hz
20kHz
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
%
20
20k
50
100
200
500
1k
2k
5k
10k
Hz
VDD=5V
RL=4
BTL
Po=2W
Av=-1V/V
Av=-2V/V
Av=-4V/V
Figure 1
Figure 2
Figure 3
Figure 4
Total Harmonic Distortion Plus
Noise vs Output Power
Total Harmonic Distortion Plus
Noise vs Frequency
Total Harmonic Distortion Plus
Noise vs Output Power
Total Harmonic Distortion Plus
Noise vs Frequency
Ver: 1.2
Jun 29, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
4
G1422
Global Mixed-mode Technology Inc.
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
%
2m
2
5m
10m
20m
50m
100m
200m
500m
1
W
VDD=5V
RL=8
BTL
Av=-2V/V
20kHz
1kHz
20 Hz
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
%
20
20k
50
100
200
500
1k
2k
5k
10k
Hz
VDD=5V
RL=8
BTL
Po=1W
Av=-1V/V
Av=-2V/V
Av=-4V/V
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
%
1m
1
2m
5m
10m
20m
50m
100m
200m
500m
W
VDD=5V
RL=32
BTL
Av=-2V/V
20kHz
1kHz
20 Hz
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
%
1m
1
2m
5m
10m
20m
50m
100m
200m
500m
W
VDD=3.3V
RL=4
BTL
Av=-2V/V
1kHz
20kH
20 Hz
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
%
20
20k
50
100
200
500
1k
2k
5k
10k
Hz
VDD=3.3V
RL=4
BTL
Po=0.75W
Av=-1V/V
Av=-2V/V
Av=-4V/V
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
%
1m
1
2m
5m
10m
20m
50m
100m
200m
500m
W
VDD=3.3V
RL=8
BTL
Av=-2V/V
1kHz
20kHz
20 Hz
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Total Harmonic Distortion Plus
Noise vs Output Power
Total Harmonic Distortion Plus
Noise vs Frequency
Total Harmonic Distortion Plus
Noise vs Output Power
Total Harmonic Distortion Plus
Noise vs Frequency
Total Harmonic Distortion Plus
Noise vs Frequency
Total Harmonic Distortion Plus
Noise vs Output Power
Ver: 1.2
Jun 29, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
5
G1422
Global Mixed-mode Technology Inc.
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
%
20
20k
50
100
200
500
1k
2k
5k
10k
Hz
VDD=3.3V
RL=8
BTL
Po=0.45W
Av=-4V/V
Av=-2V/V
Av=-1V/V
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
%
1m
500m
2m
5m
10m
20m
50m
100m
200m
W
VDD=5V
RL=16
SE
Av=-2V/V
1kHz
20 Hz
20kHz
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
%
20
20k
50
100
200
500
1k
2k
5k
10k
Hz
VDD=5V
RL=16
SE
Po=150mW
Av=-1V/V
Av=-2V/V
Av=-4V/V
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
%
1m
1
2m
5m
10m
20m
50m
100m
200m
500m
W
VDD=5V
RL=32
SE
Av=-2V/V
20 Hz
1kHz
20kHz
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
%
1m
1
2m
5m
10m
20m
50m
100m
200m
500m
W
VDD=5V
RL=4
SE
Av=-2V/V
1kHz
100Hz
20kHz
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
%
1m
1
2m
5m
10m
20m
50m
100m
200m
500m
W
VDD=5V
RL=8
SE
Av=-2V/V
1kHz
100kHz
20kHz
Figure 11
Figure 12
Figure 13
Figure 14
Figure 15
Figure 16
Total Harmonic Distortion Plus
Noise vs Frequency
Total Harmonic Distortion Plus
Noise vs Output Power
Total Harmonic Distortion Plus
Noise vs Output Power
Total Harmonic Distortion Plus
Noise vs Output Power
Total Harmonic Distortion Plus
Noise vs Frequency
Total Harmonic Distortion Plus
Noise vs Output Power
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