Document
Global Mixed-mode Technology Inc.
G1422
2W Stereo Audio Amplifier
Features
General Description
The G1422 is a stereo audio power amplifier in 20pin TSSOP thermal pad package. 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 design in the notebook application, the G1422 supports the BridgeTied Load (BTL) mode for driving the speakers, Single-End (SE) mode for driving the headphone. For the low current consumption applications, the SHDN mode is supported to disable the G1422 when it is idle. The current consumption can be further reduced to below 2µA.
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Depop Circuitry Integrated 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), Single-Ended (SE) Shutdown Control Available Thermal protection Surface-Mount Power Package 20-Pin TSSOP-P
Applications
Stereo Power Amplifiers for Notebooks or Desktop Computers Multimedia Monitors Stereo Power Amplifiers for Portable Audio Systems
Ordering Information
ORDER NUMBER
G1422F2U Note:F2: TSSOP-20 (FD) U: Tape & Reel
ORDER NUMBER (Pb free)
G1422F2Uf
MARKING
G1422
TEMP. RANGE
-40°C to +85°C
PACKAGE
TSSOP-20 (FD)
Pin Configuration
G1422
SHUTDOWN GND/HS +OUTA VDD -OUTA -INA GND/HS +INA GND/HS 1 2 3 4 5 6 7 8 9 19 18 17 16 15 14 13 12 20 HP-IN GND/HS +OUTB VDD -OUTB -INB BYPASS +INB GND/HS
Thermal Pad
GND/HS 10
11 GND/HS
Top View TSSOP-20 (FD)
Bottom View
Note: Recommend connecting the Thermal Pad to the GND for excellent power dissipation.
Ver: 1.2 Jun 29, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
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
G1422
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) (2)
: Recommended PCB Layout : Human body model : C = 100pF, R = 1500Ω, 3 positive pulses plus 3 negative pulses
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Electrical Characteristics
DC Electrical Characteristics, VDD = 5.0V, TA=+25°C, unless otherwise noted PARAMETER
Supply Current DC Differential Output Voltage IDD in Shutdown Headphone High Input Voltage Headphone Low Input Voltage
SYMBOL
IDD VO(DIFF) ISD VIH VIL VDD = 5V
CONDITION
Stereo BTL STEREO SE VDD = 5V,Gain = 2 VDD = 5V
MIN
--------4 ---
TYP
8.5 4 5 0.1 -----
MAX
15 8 50 2 --0.8
UNIT
mA mV µA V V
(AC Operation Characteristics, VDD = 5.0V, TA=+25°C, RL = 4Ω, unless otherwise noted) PARAMETER SYMBOL CONDITION
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, SE G = 1, THD = 1% RL = 4Ω, Open Load f = 120Hz f = 1kHz
MIN
---------------------------------------------
TYP
2 1.25 2.5 1.6 550 340 700 440 92 300 100 15 2.5 20 65 75 80 80 85 2 90 55
MAX
---------------------------------------------
UNIT
W
mW
m%
Maximum output power bandwidth Phase margin Power supply ripple rejection Channel-to-channel output separation Input separation BTL attenuation in SE mode Input impedance Signal-to-noise ratio Output noise voltage
BOM PSRR
kHz ° dB dB dB dB MΩ dB µV (rms)
ZI Vn PO = 500mW, BTL Output noise voltage
Note :Output power is measured at the output terminals of the IC at 1kHz.
Ver: 1.2 Jun 29, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
2
Global Mixed-mode Technology Inc.
Typical Characteristics
Table of Graphs
G1422
FIGURE
2,4,6,9,11,15,17 1,3,5,7,8,10,12,13,14,16,18 20 19 22,23 21 24 25,26 27,28 29,30,31,32
THD +N Total harmonic distortion plus noise Output noise voltage Vn Supply ripple rejection ratio Crosstalk Open loop response IDD Supply current
vs Frequency vs Output Power vs Frequency vs Frequency vs Frequency vs Frequency Vs Supply Voltage vs Load Resistance Vs Load Resistance vs Output Power
PO Output power www.DataSheet4U.com PD Power dissipation
Total Harmonic Distortion Plus Noise vs Output Power
10 5 10 5
Total Harmonic Distortion Plus Noise vs Frequency
20kHz
2 1 0.5 % 0.2 0.1 0.05
2 1
Po=1.8W
1kHz
%
0.5
0.2
20 Hz
0.02 0.01 3m
VDD=5V RL=3Ω BTL Av=-2V/V
20m 50m 100m W 200m 500m 1 2 3
0.1 0.05
0.02 0.01 20
VDD=5V RL=3Ω BTL Av=-2V/V
50 100 200 500 Hz 1k 2k 5k 10k 20k
5m
10m
Figure 1
Figure 2
Total Harmonic Distortion Plus Noise vs Output Powe.