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PDF G1426 Data sheet ( Hoja de datos )
| Número de pieza | G1426 | |
| Descripción | 2.2W Stereo Audio Amplifier | |
| Fabricantes | Global Mixed-mode Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de G1426 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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Global Mixed-mode Technology Inc.
2.2W Stereo Audio Amplifier
G1426
Features
Depop Circuitry Integrated
Output Power at 10% THD+N, VDD=5V
--2.2W/CH (typical) into a 4Ω Load
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)
Shutdown Control Available
Thermal protection
www.DataSheet4U.cSoumrface-Mount Power Package
20-Pin TSSOP-P
General Description
The G1426 is a stereo audio power amplifier in 20pin
TSSOP package. It can deliver 2W continuous RMS
power into 4Ω load per channel in Bridge-Tied Load
(BTL) mode at 5V supply voltage under 1% THD. To
simplify the audio system design in the notebook ap-
plication, The G1426 supports the Bridge-Tied Load
(BTL) mode for driving the speakers. For the low cur-
rent consumption applications, the SHDN mode is
supported to disable the G1426 when it is idle. The
current consumption can be further reduced to below
2µA.
Applications
Stereo Power Amplifiers for Notebooks or
Desktop Computers
Multimedia Monitors
Stereo Power Amplifiers for Portable Audio
Systems
Ordering Information
ORDER
NUMBER
MARKING
TEMP.
RANGE
PACKAGE
G1426D5X G1426 -40°C to +85°C TSSOP-20L
G1426F2X G1426 -40°C to +85°C TSSOP-20L (FD)
Note: X Specify the packing type
U: Tape & Reel
T: Tube
* TSSOP-20L (FD): Thermal Pad
Pin Configuration
SHUTDOWN 1
GND/HS 2
+OUTA 3
VDD 4
-OUTA 5
-INA 6
GND/HS 7
+INA 8
NC 9
GND/HS 10
G1426
Top View
20Pin TSSOP
20 GND/HS
19 GND/HS
18 +OUTB
17 VDD
16 -OUTB
15 -INB
14 BYPASS
13 +INB
12 NC
11 NC
Ver: 1.0
Dec 04, 2003
1
Thermal
Pad
Bottom View
TEL: 886-3-5788833
http://www.gmt.com.tw
1 page  
Global Mixed-mode Technology Inc.
G1426
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT POWER
TOTAL HARMONIC DISTORTION PLUS NOISE
vs FREQUENCY
10
5
www.DataSheet4U.com
2
1
0.5
%
0.2
0.1
0.05
1kHz
20Hz
0.02
0.01
3m 5m
10m 20m
20kHz
50m 100m 200m
W
Figure 3
VDD=5V
RL=4Ω
BTL
Av=-2V/V
500m
1
23
10
5
2
1
0.5
%
0.2
0.1
0.05
0.02
0.01
20
Av=-2V/V
Av=-4V/V
Av=-1V/V
VDD=5V
RL=4Ω
BTL
Po=2W
50 100 200
500 1k
2k
Hz
Figure 4
5k 10k 20k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT POWER
TOTAL HARMONIC DISTORTION PLUS NOISE
vs FREQUENCY
10
5
2
1
0.5
%
0.2
0.1
0.05
0.02
0.01
2m
20kHz
1kHz
20Hz
VDD=5V
RL=8Ω
BTL
Av=-2V/V
5m 10m 20m
50m 100m
W
200m
Figure 5
500m
1
2
10
5
2
1
0.5
%
0.2
VDD=5V
RL=8Ω
BTL
Po=1W
Av=-2V/V
Av=-4V/V
0.1
0.05
0.02 Av=-1V/V
0.01
20
50 100 200
500
Hz
1k
2k
Figure 6
5k 10k 20k
Ver: 1.0
Dec 04, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
5
5 Page 
Global Mixed-mode Technology Inc.
G1426
Application Information
Bridged-Tied Load Mode Operation
G1426 has two linear amplifiers to drive both ends of
the speaker load in Bridged-Tied Load (BTL) mode
operation. Figure 1 shows the BTL configuration. The
differential driving to the speaker load means that
when one side is slewing up, the other side is slewing
down, and vice versa. This configuration in effect will
double the voltage swing on the load as compared to a
ground reference load. In BTL mode, the peak-to-peak
voltage VO(PP) on the load will be two times than a
ground reference configuration. The voltage on the
load is doubled, this will also yield 4 times output
www.DataSheetp4oUw.ceomr on the load at the same power supply rail and
loading. Another benefit of using differential driving
configuration is that BTL operation cancels the dc off-
sets, which eliminates the dc coupling capacitor that is
needed to cancelled dc offsets in the ground reference
configuration. Low-frequency performance is then lim-
ited only by the input network and speaker responses.
Cost and PCB space can be minimized by eliminating
the dc coupling capacitors.
VDD
VDD
RL
Vo(PP)
2xVo(PP)
Optimizing DEPOP Operation
Circuitry has been implemented in G1426 to mini-
mize the amount of popping heard at power-up and
when coming out of shutdown mode. Popping oc-
curs whenever a voltage step is applied to the
speaker and making the differential voltage gener-
ated at the two ends of the speaker. To avoid the
popping heard, the bypass capacitor should be
chosen promptly, 1/(CBx100kΩ) ≦ 1/(CI*(RI+RF)).
Where 100kΩ is the output impedance of the
mid-rail generator, CB is the mid-rail bypass capaci-
tor, CI is the input coupling capacitor, RI is the input
impedance, RF is the gain setting impedance which
is on the feedback path. CB is the most important
capacitor. Besides it is used to reduce the popping,
CB can also determine the rate at which the amplifier
starts up during startup or recovery from shutdown
mode.
De-popping circuitry of G1426 is shown on Figure 2.
The PNP transistor limits the voltage drop across
the 225kΩ by slewing the internal node slowly when
power is applied. At start-up, the voltage at
BYPASS capacitor is 0. The PNP is ON to pull the
mid-point of the bias circuit down. So the capacitor
sees a lower effective voltage, and thus the charg-
ing is slower. This appears as a linear ramp (while
the PNP transistor is conducting), followed by the
expected exponential ramp of an R-C circuit.
-Vo(PP)
VDD
Figure 1
SHUTDOWN Mode Operations
G1426 implements the shutdown mode operations
to reduce supply current, IDD, to the absolute mini-
mum level during nonuse periods for battery-power
conservation. When the shutdown pin (pin 1) is
pulled high, all linear amplifiers will be deactivated
to mute the amplifier outputs. And G1426 enters an
extra low current consumption state, IDD is smaller
than 2µA. Shutdown pin should never be left un-
connected, this floating condition will cause the am-
plifier operations unpredictable.
VDD/2
Vo(PP)+VDD/2
RL Vo(PP)
VDD/2
Figure 2
Ver: 1.0
Dec 04, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet G1426.PDF ] | |
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