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Global Mixed-mode Technology Inc.
2W Stereo Audio Amplifier
G1420
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
„ Bridge-Tied Load (BTL), Single-Ended (SE)
„ Stereo Input MUX
„ Mute and Shutdown Control Available
„ Surface-Mount Power Package
24-Pin TSSOP-P
www.DataSheet4U.com
Applications
„ Stereo Power Amplifiers for Notebooks or
Desktop Computers
„ Multimedia Monitors
„ Stereo Power Amplifiers for Portable Audio
Systems
General Description
G1420 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, G1420 supports the Bridge-Tied
Load (BTL) mode for driving the speakers, Single-End
(SE) mode for driving the headphone. G1420 can
mute the output when Mute-In is activated. For the low
current consumption applications, the SHDN mode is
supported to disable G1420 when it is idle. The current
consumption can be further reduced to below 5µA.
G1420 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.
Ordering Information
ORDER
NUMBER
G1420F31U
Note: F3: TSSOP-24 (FD)
U: Tape & Reel
ORDER NUMBER
(Pb free)
G1420F31Uf
Pin Configuration
TEMP.
RANGE
-40°C to +85°C
PACKAGE
TSSOP-24 (FD)
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
G1420
24 GND/HS
23 NC
22 ROUT+
21 RLINEIN
20 RHPIN
19 RBYPASS
18 RVDD
17 NC
16 HP/LINE
15 ROUT-
14 SE/BTL
13 GND/HS
Thermal
Pad
Top View
TSSOP-24 (FD)
Bottom View
Note: Recommend connecting the Thermal Pad to the GND for excellent power dissipation.
14
Ver: 1.5
Aug 04, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
1

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Global Mixed-mode Technology Inc.
G1420
Absolute Maximum Ratings
Supply Voltage, VCC…………………..…..…….……...6V
Operating Ambient Temperature Range
TA…….…………………………….……….40°C to +85°C
Maximum Junction Temperature, TJ…….…….…150°C
Storage Temperature Range, TSTG……-65°C to+150°C
Reflow Temperature (soldering, 10sec)…………260°C
Power Dissipation (1)
TA 25°C…………………………………………..2.7W
TA 70°C…………………………………………..1.7W
TA 85°C………………….……………………….1.4W
Electrostatic Discharge, VESD
Human body mode..…………………….-3000 to 3000(2)
Note:
(1) : Recommended PCB Layout
(2) : Human body model : C = 100pF, R = 1500Ω, 3 positive pulses plus 3 negative pulses
www.DataSheetE4Ul.ecocmtrical Characteristics
DC Electrical Characteristics, TA=+25°C
PARAMETER
Supply Current
DC Differential Output Voltage
Supply Current in Mute Mode
IDD in Shutdown
SYMBOL
IDD
VO(DIFF)
IDD(MUTE)
ISD
CONDITIONS
VDD =3.3V
Stereo BTL
Stereo SE
VDD = 5V
Stereo BTL
Stereo SE
VDD = 5V,Gain = 2
VDD = 5V
Stereo BTL
Stereo SE
VDD = 5V
MIN
---
---
---
---
---
---
---
TYP
7
3.5
8
4
5
8
4
2
MAX
13
8
16
10
50
16
10
5
UNIT
mA
mV
mA
µA
(AC Operation Characteristics, VDD = 5.0V, TA=+25°C, RL = 4Ω, unless otherwise noted)
PARAMETER
SYMBOL
CONDITIONS
THD = 1%, BTL, RL = 4Ω
THD = 1%, BTL, RL = 8Ω
THD = 10%, BTL, RL = 4Ω
Output power (each channel) see Note
P(OUT)
THD = 10%, BTL, RL = 8Ω
THD = 1%, SE, RL = 4Ω
THD = 1%, SE, RL = 8Ω
THD = 10%, SE, RL = 4Ω
THD = 10%, SE, RL L = 8Ω
THD = 0.5%, SE, RL = 32Ω
PO = 1.6W, BTL, RL = 4Ω
Total harmonic distortion plus noise
THD+N
PO = 1W, BTL, RL = 8Ω
PO = 75mW, SE, RL = 32Ω
VI = 1V, RL = 10KΩ, G = 1
Maximum output power bandwidth
BOM G = 1, THD = 1%
Phase margin
RL = 4Ω, Open Load
Power supply ripple rejection
PSRR f = 120Hz
Mute attenuation
Channel-to-channel output separation
f = 1kHz
Line/HP input separation
BTL attenuation in SE mode
Input impedance
ZI
Signal-to-noise ratio
PO = 500mW, BTL
Output noise voltage
Vn Output noise voltage
Note :Output power is measured at the output terminals of the IC at 1kHz.
MIN
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
TYP
1.8
1.12
2
1.4
500
320
650
400
90
500
150
20
10
20
60
75
85
82
80
85
2
90
55
MAX UNIT
---
---
---
W
---
---
---
--- mW
---
---
---
---
---
m%
---
--- kHz
--- °
--- dB
--- dB
--- dB
--- dB
--- dB
--- MΩ
--- dB
--- µV (rms)
Ver: 1.5
Aug 04, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
2

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Global Mixed-mode Technology Inc.
G1420
(AC Operation Characteristics, VDD = 3.3V, TA=+25°C, RL = 4Ω, unless otherwise noted)
PARAMETER
SYMBOL
CONDITIONS
THD = 1%, BTL, RL = 4Ω
THD = 1%, BTL, RL = 8Ω
THD = 10%, BTL, RL = 4Ω
Output power (each channel) see Note
P(OUT)
THD = 10%, BTL, RL = 8Ω
THD = 1%, SE, RL = 4Ω
THD = 1%, SE, RL = 8Ω
THD = 10%, SE, RL = 4Ω
THD = 10%, SE, RL L = 8Ω
THD = 0.5%, SE, RL = 32Ω
PO = 1.6W, BTL, RL = 4Ω
www.DataSheetT4oUt.aclohmarmonic distortion plus noise
THD+N
PO = 1W, BTL, RL = 8Ω
PO = 75mW, SE, RL = 32Ω
VI = 1V, RL = 10KΩ, G = 1
Maximum output power bandwidth
Phase margin
Power supply ripple rejection
BOM
PSRR
G = 1, THD 1%
RL = 4Ω, Open Load
f = 120Hz
Mute attenuation
Channel-to-channel output separation
f = 1kHz
Line/HP input separation
BTL attenuation in SE mode
Input impedance
ZI
Signal-to-noise ratio
PO = 500mW, BTL
Output noise voltage
Vn Output noise voltage
Note :Output power is measured at the output terminals of the IC at 1kHz.
MIN
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
TYP
0.8
0.5
1
0.6
230
140
290
180
43
270
100
20
10
20
60
75
85
80
80
85
2
90
55
MAX UNIT
---
---
---
W
---
---
---
--- mW
---
---
---
---
---
m%
---
--- kHz
--- °
--- dB
--- dB
--- dB
--- dB
--- dB
--- MΩ
--- dB
--- µV (rms)
Ver: 1.5
Aug 04, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
3