Document
Global Mixed-mode Technology Inc.
G1428
2W Stereo Audio Amplifier
2X\6X\12X\24X Selectable Gain Settings
Features
Internal Gain Control, Which Eliminates External 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), Single-Ended (SE) Stereo Input MUX www.DataSheet4U.com PC-Beep Input Fully differential Input Shutdown Control Available Surface-Mount Power Package 24-Pin TSSOP-P
General Description
G1428 is a stereo audio power amplifier in 24pin TSSOP thermal pad package. It can drive 2.0W 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, G1428 supports the Bridge-Tied 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 G1428 when it is idle. The current consumption can be reduced to 160µA (typically). Amplifier gain is internally configured and controlled by two terminals (GAIN0, GAIN1). BTL gain settings of 2, 6, 12, 24V/V are provided, while SE gain is always configured as 1V/V for headphone driving. G1428 also supports two input paths, that means two different amplitude AC signals can be applied and chosen by setting HP/ LINE pin. It enhances the hardware designing flexibility.
Applications
Stereo Power Amplifiers for Notebooks or Desktop Computers Multimedia Monitors Stereo Power Amplifiers for Portable Audio Systems
Ordering Information
ORDER NUMBER
G1428F31U Note: U: Tape & Reel (FD): Thermal Pad
ORDER NUMBER (Pb free)
G1428F31Uf
MARKING
G1428
TEMP. RANGE
-40°C to +85°C
PACKAGE
TSSOP-24 (FD)
Pin Configuration
GND/HS GAIN0 GAIN1 LOUT+ LLINEIN LPHIN PVDD RIN LOUT-
1 2 3 4 5 6 7 8 9
24 23 22 21 20 19 18 17 16 15 14 13
GND/HS RLINEIN SHUTDOWN ROUT+ RHPIN VDD PVDD HP/LINE ROUTSE/BTL PC-BEEP GND/HS 14
Thermal Pad
LIN 10 BYPASS 11 GND/HS 12
Top View TSSOP-24
Bottom View
Ver: 1.2 Mar 31, 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
Note:
(1) (2)
G1428
Power Dissipation (1) TA ≤ 25°C …...…….….…………….….………..2.7W TA ≤ 70°C …………….………………..………..1.7W Electrostatic Discharge, VESD Human body mode..………………………………3000(2)
: Recommended PCB Layout : Human body model : C = 100pF, R = 1500Ω, 3 positive pulses plus 3 negative pulses
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Characteristics
SYMBOL
VDD VIH VIL VO(DIFF) IDD ISD
DC Electrical Characteristics, TA=+25°C PARAMETER
Supply voltage VDD High-Level Input voltage, VIH Low-Level Input voltage, VIL DC Differential Output Voltage Supply Current in Mute Mode IDD in Shutdown
CONDITION
SE/ BTL , HP/ LINE , SHUTDOWN , GAIN0 , GAIN1 SE/ BTL , HP/ LINE , SHUTDOWN , GAIN0, GAIN1 VDD = 5V,Gain = 2 VDD = 5V VDD = 5V Stereo BTL Stereo SE
MIN
4.5 3.5 ---------
TYP
5 ----5 7.5 4 160
MAX
5.5 --1 50 13 7 300
UNIT
V V V mV mA µA
(AC Operation Characteristics, VDD = 5.0V, TA=+25°C, RL = 4Ω, unless otherwise noted) PARAMETER SYMBOL CONDITION
THD = 1%, BTL, RL = 4Ω G=-2V/V THD = 1%, BTL, RL = 8Ω G=-2V/V THD = 10%, BTL, RL = 4Ω G=-2V/V THD = 10%, BTL, RL = 8Ω G=-2V/V THD = 0.1%, SE, RL = 32Ω PO = 1.6W, BTL, RL = 4Ω G=-2V/V Total harmonic distortion plus noise THD+N PO = 1W, BTL, RL = 8Ω G=-2V/V PO = 75mW, SE, RL = 32Ω VI = 1V, RL = 10KΩ, SE THD = 5% F=1kHz, BTL mode G=-2V/V CBYP=1µF f = 1kHz
MIN
-----------------------------
TYP
2 1.25 2.5 1.6 85 100 60 80 30 >15 68 80 80
MAX
---------------------------
UNIT
W
Output power (each channel) see Note
P(OUT)
mW
m%
Maximum output power bandwidth Power supply ripple rejection Channel-to-channel output separation Line/HP 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, G=-2V/V BTL, G=-2V/V, A Weighted filter
85 --See Table 2 --90 ----45 ---
Note :Output power is measured at the output terminals of the IC at 1kHz.
Ver: 1.2 Mar 31, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
2
Global Mixed-mode Technology Inc.
Typical Characteristics
Table of Graphs
G1428
FIGURE
1,2,7,8,13,14,19,21 3,4,5,6,9,10,11,12,15,16,17,18,20 22 27 23,24 25,26 28,29 30,31
vs Frequency THD +N Total harmonic distortion plus noise Output noise voltage Vn PO PD Supply ripple rejection ratio Crosstalk Output power Power dissipation vs Output Power vs Output Voltage vs Frequency vs Frequency vs Frequency vs Load Resistance vs Output Power
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Toal Harmon.