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PDF G1431 Data sheet ( Hoja de datos )
| Número de pieza | G1431 | |
| Descripción | 2W Stereo Audio Amplifier | |
| Fabricantes | Global Mixed-mode Technology | |
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Global Mixed-mode Technology Inc.
2W Stereo Audio Amplifier
G1431
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 4Ω Load
--1.2W/CH (typical) into a 8Ω Load
Bridge-Tied Load (BTL) Supported
Fully differential Input
Shutdown Control Available
www.DataSheet4U.cSoumrface-Mount Power Package
20-Pin TSSOP-P & 20-Pin TQFN 4X4
Applications
Stereo Power Amplifiers for Notebooks or
Desktop Computers
Multimedia Monitors
Stereo Power Amplifiers for Portable Audio
Systems
Pin Configuration
General Description
G1431 is a stereo audio power amplifier in 20pin
TSSOP thermal pad package or 20-pin TQFN 4X4. It
can drive 2W continuous 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 de-
sign 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 cur-
rent consumption applications, the SHDN mode is
supported to disable G1431 when it is idle. The current
consumption can be reduced to 150µA (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 -40°C to +85°C TSSOP-20 (FD)
G1431R9U 1431 -40°C to +85°C TQFN4X4-20
Note: F2: TSSOP-20 (FD) R9:TQFN4X4-20
U: Tape & Reel
SHUTDOWN 16
GND 17
GND 18
GAIN0 19
GAIN1 20
Thermal
Pad
10 NC
9 GND
8 GND
7 BYPASS
6 LIN+
G1431 TQFN4X4-20
GND 1
GAIN0 2
GAIN1 3
LOUT+ 4
LIN- 5
PVDD 6
RIN+ 7
LOUT- 8
LIN+ 9
BYPASS 10
G1431
Thermal
Pad
Top View
TSSOP-20 (FD)
20 GND
19 SHUTDOWN
18 ROUT+
17 RIN-
16 VDD
15 PVDD
14 ROUT-
13 GND
12 NC
11 GND
Ver: 1.5
Oct 25, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
1
1 page  
Global Mixed-mode Technology Inc.
Typical Characteristics (continued)
G1431
Total Harmonic Distortion Plus
Noise vs Output Power
10
5 15kHz
2
1
0.5
%
0.2
www.DataSheet4U.com0.1
0.05
0.02
VDD=5V
RL=4Ω
Av=15.6dB
1kHz
20Hz
0.01
3m 5m
10m 20m
50m 100m 200m
W
Figure 11
500m
1
23
Total Harmonic Distortion Plus
Noise vs Output Power
10
5 15kHz
2
1
0.5
%
0.2
1kHz
0.1
VDD=5V
0.05 RL=4Ω
Av=21.6dB
0.02
20Hz
0.01
3m 5m 10m 20m
50m 100m 200m
W
Figure 12
500m
1
23
Total Harmonic Distortion
Plus Noise vs Frequency
10
5 VDD=5V
RL=8Ω
2 Av=6dB
1
0.5
%
0.2
0.1
0.05
Po=1W
Po=0.25W
0.02 Po=0.5W
0.01
20
50 100 200
500
Hz
1k
2k
Figure 13
5k 10k 20k
10
5
2
1
0.5
%
0.2
0.1
0.05
Total Harmonic Distortion
Plus Noise vs Frequency
VDD=5V
RL=8Ω
Po=1W
Av=15.6dB
Av=21.6dB
Av=6dB
0.02
0.01
20
Av=10dB
50 100 200
500
Hz
1k
2k
Figure 14
5k 10k 20k
Total Harmonic Distortion Plus
Noise vs Output Power
10
5
15kHz
2
1
VDD=5V
RL=8Ω
Av=6dB
0.5
%
0.2
1kHz
0.1
0.05
20Hz
0.02
0.01
3m 5m
10m 20m
50m 100m 200m
W
Figure 15
500m
1
23
Ver: 1.5
Oct 25, 2006
Total Harmonic Distortion Plus
Noise vs Output Power
10
5
2 15kHz
VDD=5V
RL=8Ω
Av=10dB
1
0.5
%
0.2
1kHz
0.1
0.05
20Hz
0.02
0.01
3m 5m
10m 20m
50m 100m 200m
W
Figure 16
500m
1
23
TEL: 886-3-5788833
http://www.gmt.com.tw
5
5 Page 
Global Mixed-mode Technology Inc.
G1431
Application Information
Gain setting via GAIN0 and GAIN1 inputs
The internal gain setting is determined by two input
terminals, GAIN0 and GAIN1. The gains listed in Table
1 are realized by changing the taps on the input resis-
tors inside the amplifier. This will cause the internal
input impedance, ZI, to be dependent on the gain set-
ting. Although the real input impedance will shift by
30% due to process variation from part-to-part, the
actual gain settings are controlled by the ratios of the
resistors and the actual gain distribution from part-to-
part is quite good.
www.DataSheetT4Uab.cloem1
GAIN0
0
0
1
1
GAIN1
0
1
0
1
AV (dB)
6
10
15.6
21.6
Input Resistance
The typical input impedance at each gain setting is
given in the Table 2. Each gain setting is achieved by
varying the input resistance of the amplifier, which can
be over 6 times from its minimum value to the maxi-
mum value. As a result, if a single capacitor is used in
the input high pass filter, the –3dB or cut-off frequency
will be also change over 3.5 times. To reduce the
variation of the cut-off frequency, an additional resistor
can be connected from the input pin of the amplifier to
the ground, as shown in the figure below. With the
extra resistor, the cut-off frequency can be
re-calculated using equation : f-3dB= 1/ 2πC(R||RI).
Using small external R can reduce the variation of the
cut-off frequency. But the side effect is small external
R will also let (R||RI) become small, the cut-off fre-
quency will be larger and degraded the bass-band
performance. The other side effect is with extra power
dissipation through the external resistor R to the
ground. So using the external resistor R to flatting the
variation of the cut-off frequency, the user must also
consider the bass-band performance and the extra
power dissipation to choose the accepted external
resistor R value.
Table 2
Zi (kΩ)
30
45
70
90
AV (dB)
21.6
15.6
10
6
Input Capacitor
In the typical application, an input capacitor Ci is re-
quired to allow the amplifier to bias the input signal to
the proper dc level for optimum operation. In this case,
Ci and the input impedance of the amplifier, Zi, form a
high-pass filter with the –3dB determined by the equa-
tion: f-3dB= 1/ 2πRI Ci
The value of Ci is important to consider as it directly
affects the bass performance of the application circuit.
For example, if the input resistor is 15kΩ, the input
capacitor is 1µF, the flat bass response will be down to
10.6Hz.
Because the small leakage current of the input ca-
pacitors will cause the dc offset voltage at the input to
the amplifier that reduces the operation headroom,
especially at the high gain applications. The low-
leakage tantalum or ceramic capacitors are suggested
to be used as the input coupling capacitors. When
using the polarized capacitors, it is important to let the
positive side connecting to the higher dc level of the
application.
Power Supply Decoupling
The G1431 is a high-performance CMOS audio ampli-
fier that requires adequate power supply decoupling to
make sure the output total harmonic distortion (THD)
as low as possible. The optimum decoupling is using
two capacitors with different types that target different
types of noise on the power supply leads. For high
frequency transients, spikes, a good low ESR ceramic
capacitor works best, typically 0.1µF/1µF used and
placed as close as possible to the G1431 VDD lead. A
larger aluminum electrolytic capacitor of 10µF or
greater placed near the device power is recommended
for filtering low-frequency noise.
Input Signal
C
IN
R
Zi
Zf
Ver: 1.5
Oct 25, 2006
Optimizing DEPOP Operation
Circuitry has been implemented in G1431 to minimize
the amount of popping heard at power-up and when
coming out of shutdown mode. Popping occurs when-
ever a voltage step is applied to the speaker and
making the differential voltage generated at the two
ends of the speaker. To avoid the popping heard, the
bypass capacitor should be chosen promptly,
1/(CBx170kΩ) ≦ 1/(CI*(RI+RF)). Where 170kΩ is the
output impedance of the mid-rail generator, CB is the
mid-rail bypass capacitor, CI is the input coupling ca-
pacitor, RI is the input impedance, RF is the gain set-
TEL: 886-3-5788833
http://www.gmt.com.tw
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet G1431.PDF ] | |
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