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Global Mixed-mode Technology Inc.
G1402
Stereo Headphone Power Amplifier
Features
„ High performance Class AB amplifier
„ High signal-to-noise ratio
„ Low distortion
„ Low power consumption
„ Large output voltage swing
„ Excellent power supply ripple rejection
„ 3.0V to 6.5V supply voltage range
„ Surface-Mount package-SOP 8
www.DataSheetA4Up.cpomlications
„ CD-ROM
„ DVD-ROM
„ CD-R/W
„ MP3
„ Portable Stereo
General Description
The G1402 is an output rail-to-rail stereo audio power
amplifier housed in a 8-pin SOP package capable of
delivering 125mW of continuous power into 16loads
& 75mW into 32loads with the THD <0.1% per
channel.
The gain setting of the amplifiers can simply achieve
by setting two external resistors RI (input resistor) & RF
(feedback resistor) promptly.
The G1402 is a dual channel, low voltage, low power,
and high performance amplifiers. The quiescent
current is 3mA @ 5V typically. With excellent AC
performance (small THD), it can be designed into a
wide range of headphone driving applications.
Ordering Information
ORDER
NUMBER
MARKING
TEMP.
RANGE
PACKAGE
G1402P1X G1402 -40°C to +85°C
SOP-8L
G1402P1Xf G1402 -40°C to +85°C SOP-8L (Pb free)
Note: X Specify the packing type
U: Tape & Reel
T: Tube
Pin Configuration
OUTA 1
INA(neg) 2
INA(pos) 3
VSS 4
G1402
8 VDD
7 OUTB
6 INB(neg)
5 INB(pos)
SYMBOL
OUTA
INA(neg)
INA(pos)
VSS
INB(pos)
INB(neg)
OUTB
VDD
PIN DESCRIPTION
1 output A
2 inverting input A
3 non-inverting input A
4 negative supply
5 non-inverting input B
6 inverting input B
7 output B
8 positive supply
Ver: 1.2
Jun 28, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
1

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Global Mixed-mode Technology Inc.
Block Diagram
G1402
www.DataSheet4U.com
OUTA 1
INA(neg) 2
INA(pos) 3
VSS 4
8 VDD
7 OUTB
_ 6 INB(neg)
+ 5 INB(pos)
G1402
Absolute Maximum Ratings (Note1)
SYMBOL
VDD
Tstg
Tamb
ESD
PARAMETER
Supply voltage
Storage temperature
Operating ambient temperature
ESD voltage
CONDITION
HBM
MIN
0
-65
-40
-
Notes:
1. Absolute Maximum Ratings are limits beyond which damage to the device may occur.
MAX
7.0
+150
+85
2
Thermal Characteristics
SYMBOL
PARAMETER
Rth j-a
Thermal resistance from junction to ambient in free air SO8
VALUE
240
Test and Application Information
VDD
100k
3.9k
220µF
+
VOUTA
RL
UNIT
V
°C
°C
KV
UNIT
°C/W
VINA 2.2µF 3.9k
VINB 2.2µF 3.9k
1µF 100k
18
2_
3+
G1402
5
6
74
+
C6
100µF
3.9k
220µF
+
VOUTB
RL
Fig.1 Measurement circuit for inverting application
Ver: 1.2
Jun 28, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
2

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Global Mixed-mode Technology Inc.
G1402
Electrical Characteristics
VDD = 5V; VSS = 0V; TA = 25°C; fI= 1kHz; RL = 32connected to VDD/2; unless otherwise specified.
SYMBOL
PARAMETER
Supplies
VDD Supply voltage
Single
Dual
VSS Negative supply voltage
IDD Supply current
Ptot Total power dissipation
DC Characteristics
www.DataSheet4U.comVI(OS)
VCM
GV
Input offset voltage
Common mode voltage
Open-loop voltage gain
IO
RO
VDD-VOH
Maximum output current
Output resistance
Output Voltage Swing High
VOL-VSS
PSRR
Output Voltage Swing Low
Power supply rejection ratio
αCS
Channel separation
AC Characteristics
THD
Total harmonic distortion
fG Unity gain frequency
PO Maximum output power
CONDITION
no load
no load
RL = 5k
THD+N <0.1%
closed-loop
Sourcing current = 100mA
Sinking current = 100mA
fi = 1kHz;
Vripple(rms) = 100mVrms
RL=32,Cb=1µF, PO=70mW
note 2
open-loop; RL = 5k
note 1; RL = 16; f=1kHz
note 1; RL = 32; f=1kHz
MIN
3.0
3.0
1.5
-1.5
-
-
-50
0
60
-
-
-
-
-
-
-
-
-
-
TYP MAX UNIT
5.0 6.5 V
5.0 6.5 V
2.5 3.25 V
-2.5 -3.25
V
3.0 5.0 mA
15 25 mW
- 50 mV
- 3.5 V
90 - dB
70 - mA
0.1 -
0.4 1 V
0.5 1 V
70 - dB
65 - dB
< 0.1
5
125
75
-%
- MHz
- mW
- mW
Notes:
1. Values are proportional to VDD; THD+N < 0.1%
2. VDD = 5.0V; VO(P-P) = 4.0V (at 0 dB)
Ver: 1.2
Jun 28, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
3