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G1438

更新时间： 2024-11-19 01:25:31
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描述
2W Stereo Audio Amplifier with DC Volume Control and Selectable Gain

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G1438 数据手册

  
G1438  
Global Mixed-mode Technology Inc.  
2W Stereo Audio Amplifier with DC Volume  
Control and Selectable Gain  
Features  
General Description  
„
0dB ~-78dB Internal DC Volume Gain Setting  
The G1438 is a stereo audio power amplifier in both  
28pin TSSOP and TQFN thermal pad package. It can  
deliver 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 de-  
sign in the notebook application, G1438 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 Shut-  
down mode is supported to disable the G1438 when it  
is idle. The current consumption can be reduced below  
2µA.  
Embedded  
„
„
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)  
PC-Beep Input  
Selectable Internal/External Gain Setting  
Shutdown Control Available  
Thermal Shutdown Protection  
Surface-Mount Power Package  
28-Pin TSSOP-P / 28pin TQFN Available  
„
„
„
„
„
„
The internal DC volume gain setting is ranged from  
0dB to -78dB. We can activate the internal DC volume  
control by setting the Mode pin high, and setting the  
Vol value to get the expected DC volume gain.  
Applications  
„
Stereo Power Amplifiers for Notebooks or  
Desktop Computers  
The G1438 is with the flexible for the user to select the  
internal embedded gain setting or external gains  
through the gain_sel pin. Setting the gain_sel pin low  
is to activate the internal gain settings, setting high for  
external gains.  
„
„
Multimedia Monitors  
Stereo Power Amplifiers for Portable Audio  
Systems  
Ordering Information  
ORDER  
NUMBER  
G1438F4U  
G1438R6U  
TEMP.  
RANGE  
PACKAGE  
(Pb free)  
MARKING  
G1438  
1438  
-40°C to +85°C  
-40°C to +85°C  
TSSOP-28 (FD)  
TQFN5X5-28  
Note: F4: TSSOP-28 (FD)  
U: Tape & Reel  
R6 : TQFN5X5-28  
Pin Configuration  
G1438  
28  
27  
26  
Right Out+  
VDD  
GND/HS  
Shutdown  
Gain Select  
Mode  
1
2
3
4
5
6
7
8
9
Left Gain1 22  
Beep In  
14  
Right Out-  
Right In  
13  
12  
GND/HS 23  
25 Right Gain2  
24 Right Gain1  
23 GND/HS  
HP Sense  
24  
Right Dock  
Mute  
Thermal  
Pad  
VDD  
25  
11 GND  
Bypass  
Thermal  
Pad  
22  
21  
Bypass  
DC Vol  
DC Vol  
GND/HS 26  
10  
9
GND  
HP Sense  
GND/HS  
Right Gain1 27  
VDD  
Mute  
Right Dock  
20  
19  
18  
Left Gain1  
Left Gain2  
Left Out-  
28  
Right Gain2  
8
Right In 10  
Beep In  
Left In  
11  
17  
12  
Left Dock 13  
GND/HS  
16 VDD  
14  
15 Left Out+  
Top View  
Bottom View  
TSSOP-28 (FD)  
G1438 TQFN5X5-28  
Note: Recommend connecting the Thermal Pad to the GND for excellent power dissipation.  
TEL: 886-3-5788833  
http://www.gmt.com.tw  
Ver: 1.1  
Nov 12, 2008  
1
1

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