Document
Global Mixed-mode Technology Inc.
G1421
2W Stereo Audio Amplifier with No Headphone Coupling Capacitor Function
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 Eliminates Headphone Amplifier Output Coupling Capacitors Maximum Output Power Clamping Circuitry www.DataSheet4U.com Integrated Bridge-Tied Load (BTL), Single-Ended (SE), and Stereo Headphone Amplifier (HP-IN) modes Supported Stereo Input MUX Mute and Shutdown Control Available Surface-Mount Power Package 24-Pin TSSOP-P
General Description
G1421 is a stereo audio power amplifier in 24pin TSSOP thermal pad package. It can drive 1.8W 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, G1421 supports the Bridge-Tied Load (BTL) mode for driving the speakers, Single-End (SE) mode for driving the headphone. In the HP-IN mode, it can support a DC value to the phone-jacket and drive the headphone without the audio amplifier outputs coupling capacitors. G1421 can mute the output when Mute-In is activated. For the low current consumption applications, the SHDN mode is supported to disable G1421 when it is idle. The current consumption can be further reduced to below 5µA. G1421 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 enhances the hardware designing flexibility. G1421 also supports an extra function -- the maximum output power clamping function to protect the speakers or headphones from burned-out.
Applications
Stereo Power Amplifiers for Notebooks or Desktop Computers Multimedia Monitors Stereo Power Amplifiers for Portable Audio Systems
Ordering Information
ORDER NUMBER
G1421 Note: U: Tape & Reel (FD): Thermal Pad
ORDER NUMBER (Pb free)
G1421f
TEMP. RANGE
-40°C to +85°C
PACKAGE
TSSOP-24 (FD)
Pin Configuration
G1421
GND/HS TJ LOUT+ LLINEIN LHPIN LBYPASS LVDD SHUTDOWN MUTE OUT 1 2 3 4 5 6 7 8 9 24 23 22 21 20 19 18 17 16 15 14 13 GND/HS VOL ROUT+ RLINEIN RHPIN RBYPASS RVDD HP-IN HP/LINE ROUTSE/BTL GND/HS 14
Thermal Pad
LOUT- 10 MUTE IN 11 GND/HS 12
Top View TSSOP-24 (FD)
Bottom View
Note: Recommend connecting the Thermal Pad to the GND for excellent power dissipation.
Ver: 1.6 Aug 04, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
Supply Voltage, VDD……………………..………...…...6V Input Voltage, VI………………………-0.3V to VDD+0.3V 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)
G1421
Power Dissipation (1) TA ≤ 25°C…………………………………………..2.7W TA ≤ 70°C…………………………………………..1.7W TA ≤ 85°C………………….……………………….1.4W Electrostatic Discharge, VESD Human body mode Lout- pin………………………..…………-8000 to 8000V Other pins………………………………...-3000 to 3000(2)
: Recommended PCB Layout. : Human body model : C = 100pF, R = 1500Ω, 3 positive pulses plus 3 negative pulses
www.DataSheet4U.com
Electrical Characteristics
DC Electrical Characteristics, TA=+25°C PARAMETER SYMBOL
VDD =3.3V VDD = 5V
CONDITION
HP-IN HP-IN Stereo BTL VDD =3.3V Stereo SE Stereo BTL VDD = 5V Stereo SE VDD = 5V,Gain = 2 Stereo BTL VDD = 5V HP-IN Stereo SE VDD = 5V
MIN
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TYP
5.5 6.5 7 3.5 8 4 5 8 6.5 4 2
MAX
11 14 13 8 16 10 50 16 14 10 5
UNIT
Supply Current
IDD
mA
DC Differential Output Voltage Supply Current in Mute Mode IDD in Shutdown
VO(DIFF) IDD(MUTE) ISD
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 THD = 1%, BTL, RL = 8Ω THD = 10%, BTL, RL = 4Ω 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 PO = 1W, BTL, RL = 8Ω PO = 75mW, SE, RL = 32Ω VI = 1V, RL = 10KΩ, G = 1 G = 1, THD =1% RL = 4Ω, Open Load f = 120Hz f = 1kHz
MIN
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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
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UNIT
W
Output power (each channel) see Note
P(OUT)
mW
Total harmonic distortion plus noise Maximum output power bandwidth Phase margin Power supply ripple rejection Mute attenuation Channel-to-channel output separation Line/HP input separation BTL attenuation in SE mode Input impedance Signal-to-noise ratio Output noise voltage
THD+N BOM PSRR
m% kHz ° dB 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: 1.6 Aug 04, 2005
TEL: 886-3-5788833 http:/.