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PDF G1421 Data sheet ( Hoja de datos )
| Número de pieza | G1421 | |
| Descripción | 2W Stereo Audio Amplifier | |
| Fabricantes | Global Mixed-mode Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de G1421 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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Global Mixed-mode Technology Inc.
G1421
2W Stereo Audio Amplifier with No Headphone
Coupling Capacitor Function
Features
Depop Circuitry Integrated
Output Power at 1% THD+N, VDD=5V
--1.8W/CH (typical) into a 4Ω Load
--1.2W/CH (typical) into a 8Ω Load
Eliminates Headphone Amplifier Output Cou-
pling Capacitors
Maximum Output Power Clamping Circuitry
www.DataSheet4U.cInomtegrated
Bridge-Tied Load (BTL), Single-Ended (SE),
and Stereo Headphone Amplifier (HP-IN) modes
Supported
Stereo Input MUX
Mute and 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
G1421 is a stereo audio power amplifier in 24pin
TSSOP thermal pad package. It can drive 1.8W 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, G1421 supports the Bridge-Tied
Load (BTL) mode for driving the speakers, Single-End
(SE) mode for driving the headphone. In the HP-IN
mode, it can support a DC value to the phone-jacket
and drive the headphone without the audio amplifier
outputs coupling capacitors. G1421 can mute the out-
put when Mute-In is activated. For the low current
consumption applications, the SHDN mode is sup-
ported to disable G1421 when it is idle. The current
consumption can be further reduced to below 5µA.
G1421 also supports two input paths, that means two
different gain loops can be set in the same PCB and
choosing either one by setting HP/ LINE pin. It en-
hances the hardware designing flexibility. G1421 also
supports an extra function -- the maximum output
power clamping function to protect the speakers or
headphones from burned-out.
Ordering Information
ORDER
NUMBER
G1421
Note: U: Tape & Reel
(FD): Thermal Pad
ORDER NUMBER
(Pb free)
G1421f
TEMP.
RANGE
-40°C to +85°C
PACKAGE
TSSOP-24 (FD)
Pin Configuration
G1421
GND/HS 1
TJ 2
LOUT+ 3
LLINEIN 4
LHPIN 5
LBYPASS 6
LVDD 7
SHUTDOWN 8
MUTE OUT 9
LOUT- 10
MUTE IN 11
GND/HS 12
Top View
TSSOP-24 (FD)
24 GND/HS
23 VOL
22 ROUT+
21 RLINEIN
20 RHPIN
19 RBYPASS
18 RVDD
17 HP-IN
16 HP/LINE
15 ROUT-
14 SE/BTL
13 GND/HS
Thermal
Pad
14
Bottom View
Ver: 1.6
Aug 04, 2005
Note: Recommend connecting the Thermal Pad to the GND for excellent power dissipation.
TEL: 886-3-5788833
http://www.gmt.com.tw
1
1 page  
Global Mixed-mode Technology Inc.
G1421
Total Harmonic Distortion Plus
Noise vs Output Frequency
10
5 VDD=5V
RL=4Ω
2 BTL
Av=-2V/V
1
0.5
%
0.2
Po=0.25W
Po=1.5W
www.DataSheet4U.com
0.1
0 .05
0 .02
Po=0.75W
0 .01
20
50 10 0 2 00
5 00
Hz
1k
2k
Figure 5
5 k 10 k 20k
Total Harmonic Distortion Plus
Noise vs Output Power
10
VDD=5V
5 RL=8Ω
2
20kHz
BTL
Av=-2V/V
1
0.5
%
0.2
0.1
1kHz
0 .05
20Hz
0 .02
0 .01
3 m 5 m 10m 20m
5 0m
1 00m
W
20 0m
Figure 6
500 m
1
23
10
5
2
1
0.5
%
0.2
0.1
0 .05
Total Harmonic Distortion Plus
Noise vs Output Frequency
VDD=5V
RL=8Ω
BTL
Av=-2V/V
Po=0.25W
Po=1W
Po=0.5W
0 .02
0 .01
20
50 10 0 2 00
5 00
Hz
1k
2k
Figure 7
5 k 10 k 20k
Total Harmonic Distortion Plus
Noise vs Output Frequency
10
5
2
1
0.5
%
0.2
VDD=5V
RL=8Ω
BTL
Po=1W
Av=-4V/V
Av=-2V/V
0.1
0 .05
Av=-1V/V
0 .02
0 .01
20
50 10 0 2 00
5 00
Hz
1k
2k
Figure 8
5 k 10 k 20k
Total Harmonic Distortion Plus
Noise vs Output Power
10
5
20kHz
2
1
0.5
%
0.2
1kHz
0.1
VDD=3.3V
0.05 RL=3Ω
BTL
0 .02
20Hz
0 .01
1m
2m
5m 1 0m 20 m
50 m 10 0m 2 00 m
W
500 m 1
Figure 9
Total Harmonic Distortion Plus
Noise vs Output Power
10
5
20kHz
2
1
0.5
%
0.2
1kHz
0.1 VDD=3.3V
0.05 RL=4Ω
BTL
0 .02
20Hz
0 .01
1m
2m
5m 1 0m 20 m
50 m 10 0m 2 00 m
W
500 m 1
Figure 10
Ver: 1.6
Aug 04, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
5
5 Page 
Global Mixed-mode Technology Inc.
G1421
Total Harmonic Distortion Plus
Noise vs Output Frequency
10
5 VDD=3.3V
2 RL=32Ω
1 SE
0.5
Po=10mW
0.2
% 0.1
0 .05
Po=20mW
0 .02
0 .01
www.DataSheet4U.com 0.005
0.0 02
0.0 01
20
Po=30mW
50 10 0 2 00
5 00
Hz
1k
2k
5 k 10 k 20k
Figure 41
10 0u
9 0u
8 0u
7 0u
6 0u
5 0u
4 0u
V 3 0u
Output Noise Voltage
vs Frequency
VDD=5V
RL=4Ω
BW=22Hz to 20kHz
Vo BTL
20u Vo SE
1 0u
20
50 10 0 2 00
5 00
Hz
1k
2k
Figure 42
5 k 10 k 20k
10 0u
9 0u
8 0u
7 0u
6 0u
5 0u
4 0u
V 3 0u
2 0u
Output Noise Voltage
vs Frequency
VDD=5V
HP-IN
RL=4Ω
BW=22Hz to 20kHz
A- Weighted Filter
1 0u
20
5 0 1 00 2 00
5 00
Hz
1k
2k
Figure 43
5 k 10k 20k
Output Noise Voltage
vs Frequency
10 0u
9 0u
8 0u
VDD=3.3V
70u RL=4Ω
6 0u
5 0u
4 0u
BW=22Hz to 20kHz
Vo BTL
V 3 0u
20u Vo SE
1 0u
20
5 0 1 00 2 00
5 00
Hz
1k
2k
Figure 44
5 k 10k 20k
Supply Ripple Rejection
Ratio vs Frequency
+0T
-10 VDD=5V
-20 RL=4Ω
-30 CB=4.7uF
-40
d -50
B
-60
BTL
-70
-80 SE
-90
-1 00
20
5 0 1 00 2 00
5 00
Hz
1k
2k
Figure 45
5 k 10k 20k
+0T
-10
-20
-30
-40
d -50
B
-60
-70
-80
-90
-1 00
20
Supply Ripple Rejection
Ratio vs Frequency
TT
VDD=5V
HP-IN
RL=4Ω
CB=4.7uF
5 0 1 00 2 00
5 00
Hz
1k
2k
Figure 46
5 k 10k 20k
Ver: 1.6
Aug 04, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet G1421.PDF ] | |
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