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
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