Ver: 1.3
Sep 23, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
1
G1431
Global Mixed-mode Technology Inc.
2W Stereo Audio Amplifier
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 4
Load
--1.2W/CH (typical) into a 8
Load
Bridge-Tied Load (BTL) Supported
Fully differential Input
Shutdown Control Available
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
G1431 is a stereo audio power amplifier in 20pin
TSSOP thermal pad package. It can drive 2.0W 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 and to enlarge the driving power,
G1431 supports the Bridge-Tied Load (BTL) mode for
driving the speakers. For the low current consumption
applications, the SHDN mode is supported to disable
G1431 when it is idle. The current consumption can be
reduced to 150A (typically).
Amplifier gain is internally configured and controlled by
two terminals (GAIN0, GAIN1). BTL gain settings of
6dB, 10dB, 15.6dB, 21.6dB are provided.
Ordering Information
ORDER
NUMBER
MARKING
TEMP.
RANGE
PACKAGE
(Pb free)
G1431F2U
G1431
-40C to +85C TSSOP-20 (FD)
Pin Configuration
VDD
PVDD
BYPASS
SHUTDOWN
LIN-
RIN+
LIN+
G1431
TSSOP-20
13
20
19
18
17
16
15
5
6
7
8
9
10
1
4
3
2
14
GAIN0
Top View
GND
11
12 NC
Thermal
Pad
Bottom View
GND
GAIN1
LOUT+
PVDD
LOUT-
GND
ROUT-
RIN-
ROUT+
GND
VDD
PVDD
BYPASS
SHUTDOWN
LIN-
RIN+
LIN+
G1431
TSSOP-20
13
20
19
18
17
16
15
5
6
7
8
9
10
1
4
3
2
14
GAIN0
Top View
GND
11
12 NC
Thermal
Pad
Bottom View
Thermal
Pad
Bottom View
GND
GAIN1
LOUT+
PVDD
LOUT-
GND
ROUT-
RIN-
ROUT+
GND
Ver: 1.3
Sep 23, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
2
G1431
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
Electrostatic Discharge, V
ESD
Human body mode....................................3000V
(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, T
A
=+25C
PARAMETER SYMBOL
CONDITIONS
MIN
TYP
MAX
UNIT
Supply voltage VDD
V
DD
4.5 5 5.5 V
High-Level Input voltage, V
IH
V
IH
SHUTDOWN
, GAIN0, GAIN1
2 --- --- V
Low-Level Input voltage, V
IL
V
IL
SHUTDOWN
, GAIN0, GAIN1
--- --- 0.8 V
DC Differential Output Voltage
V
O(DIFF)
V
DD
= 5V,Gain = 2
---
5
50
mV
Supply Current in Mute Mode
I
DD
V
DD
= 5V Stereo BTL
---
7.5
11
mA
I
DD
in Shutdown
I
SD
V
DD
= 5V
---
160
300
A
(AC Operation Characteristics, V
DD
= 5.0V, T
A
=+25C, R
L
= 4
, unless otherwise noted)
PARAMETER SYMBOL
CONDITIONS
MIN
TYP
MAX
UNIT
THD = 1%, BTL, R
L
= 4
G=-2V/V
--- 2 ---
THD = 1%, BTL, R
L
= 8
G=-2V/V
--- 1.2 ---
THD = 10%, BTL, R
L
= 4
G=-2V/V
--- 2.5 ---
Output power (each channel) see Note
P
(OUT)
THD = 10%, BTL, R
L
= 8
G=-2V/V
--- 1.6 ---
W
P
O
= 1.6W, BTL, R
L
= 4
G=-2V/V
--- 100 ---
Total harmonic distortion plus noise
THD+N
P
O
= 1W, BTL, R
L
= 8
G=-2V/V
--- 60 ---
m%
Maximum output power bandwidth
B
OM
THD = 5%
---
15
---
kHz
Power supply ripple rejection
PSRR
F=1kHz, BTL mode G=-2V/V
C
BYP
=1uF
--- 68 --- dB
Channel-to-channel output separation
f = 1kHz
---
80
---
dB
Input impedance
ZI
See Table 2
M
Signal-to-noise ratio
P
O
= 500mW, BTL, G=-2V/V
---
90
---
dB
Output noise voltage
V
n
BTL,G=-2V/V, A Weighted filter
---
45
---
V (rms)
Note :Output power is measured at the output terminals of the IC at 1kHz.
Ver: 1.3
Sep 23, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
3
G1431
Global Mixed-mode Technology Inc.
Typical Characteristics
Table of Graphs
FIGURE
vs Frequency
1,2,7,8,13,14
THD +N Total harmonic distortion plus noise
vs Output Power
3,4,5,6,9,10,11,12,15,16,17,18
V
n
Output noise voltage
vs Frequency
21
Supply ripple rejection ratio
vs Frequency
19
Crosstalk
vs
Frequency
20
P
O
Output power
vs Load Resistance 22
P
D
Power dissipation
vs Output Power
23
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=0.5W
Po=1W
Po=1.5W
VDD=5V
RL=3
Av=6dB
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=3
Po=1.75W
Av=6dB
Av=10dB
Av=15.6dB
Av=21.6dB
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, Av=10dB
15kHz
1kHz
20Hz
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, Av=6dB
20Hz
1kHz
15kHz
Total Harmonic Distortion
Plus Noise vs Frequency
Figure 2
Figure 1
Total Harmonic Distortion Plus
Noise vs Output Power
Total Harmonic Distortion
Plus Noise vs Frequency
Figure 3
Total Harmonic Distortion Plus
Noise vs Output Power
Figure 4
Ver: 1.3
Sep 23, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
4
G1431
Global Mixed-mode Technology Inc.
Typical Characteristics
(continued)
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
Av=15.6dB
15kHz
1kHz
20Hz
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
Av=21.6dB
15kHz
1kHz
20Hz
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
Av=6dB
Po=0.25W
Po=1.5W
Po=1W
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
Po=1.75W
Av=21.6dB
Av=6dB
Av=10dB
Av=15.6dB
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, Av=6dB
15kHz
1kHz
20Hz
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, Av=10dB
15kHz
1kHz
20Hz
Total Harmonic Distortion Plus
Noise vs Output Power
Total Harmonic Distortion Plus
Noise vs Output Power
Figure 5
Figure 6
Total Harmonic Distortion
Plus Noise vs Frequency
Total Harmonic Distortion
Plus Noise vs Frequency
Figure 7
Figure 8
Figure 9
Figure 10
Total Harmonic Distortion Plus
Noise vs Output Power
Total Harmonic Distortion Plus
Noise vs Output Power
Ver: 1.3
Sep 23, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
5
G1431
Global Mixed-mode Technology Inc.
Typical Characteristics
(continued)
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
Av=15.6dB
15kHz
1kHz
20Hz
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
Av=21.6dB
15kHz
1kHz
20Hz
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=1W
Po=0.25W
Po=0.5W
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=8
Av=6dB
15kHz
1kHz
20Hz
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
Av=6dB
VDD=5V
RL=8
Po=1W
Av=21.6dB
Av=15.6dB
Av=6dB
Av=10dB
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=8
Av=10dB
15kHz
1kHz
20Hz
Total Harmonic Distortion Plus
Noise vs Output Power
Total Harmonic Distortion Plus
Noise vs Output Power
Figure 11
Figure 12
Total Harmonic Distortion
Plus Noise vs Frequency
Total Harmonic Distortion
Plus Noise vs Frequency
Figure 13
Figure 14
Total Harmonic Distortion Plus
Noise vs Output Power
Figure 15
Figure 16
Total Harmonic Distortion Plus
Noise vs Output Power
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