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Global Mixed-mode Technology Inc.
G1450
2.4W Stereo Audio Amplifier with DC Volume
Control
Features
„ 32 Steps DC Volume Control from +20dB
~-80dB
„ Depop Circuitry Integrated
„ Output Power at 1% THD+N, VDD=5V
--1.9W/CH (typical) into a 4Ω Load
--1.25W/CH (typical) into a 8Ω Load
„ Output Power at 10% THD+N, VDD=5V
--2.4W/CH (typical) into a 4Ω Load
--1.55W/CH (typical) into a 8Ω Load
„ Bridge-Tied Load (BTL) and Single-Ended (SE)
Modes Supported
„ Maximum Output Power Clamping Circuitry
Integrated
„ Ultra Low Shutdown Current
„ Thermal Shutdown Protection
„ SOP-16 Package Available
Applications
„ Notebooks
„ LCD Monitor or TV
Ordering Information
ORDER
NUMBER
G1450F81U
Note: F8: SOP-16 (FD)
1: Bonding Code
U: Tape & Reel
Pin Configuration
MARKING
G1450
General Description
The G1450 is a stereo audio power amplifier with dc
volume control in 16-pin SOP thermal pad package. It
can deliver 1.9W 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 sys-
tem design in the notebook application, the G1450
supports the Bridge-Tied Load (BTL) mode for driving
the speakers, Single-End (SE) mode for driving the
headphone. For the low current consumption applica-
tions, the shutdown mode is supported to disable the
G1450 when it is idle. The current consumption can be
reduced below 1µA.
The internal DC volume gain setting is ranged from
+20dB to -80dB with 32 steps. It is easily to get the
expected DC volume gain by applying the volume pin
with a suitable dc voltage.
The G1450 has embedded depop circuitry to suppress
the power-on or power-off transition noises. It also
supports the maximum output power clamping function
to protect the speakers from burned-out. Thermal pro-
tection circuitry is implemented to avoid unintentionally
damaging.
TEMP.
RANGE
-40°C to +85°C
PACKAGE
(Pb free)
SOP-16 (FD)
G1450
MUTE
SHUTDOWN
RIN-
BYPASS
GND
LIN-
VOLUME
VOLMAX
1
2
3
4
5
6
7
8
Thermal
Pad
16 ROUT-
15 VDD
14 ROUT+
13 SE/BTL
12 GND
11 LOUT+
10 VDD
9 LOUT-
SOP-16 (FD)
Note : Recommend connecting the Thermal Pad to the GND for excellent power dissipation.
Ver: 1.0
Dec 14, 2010
TEL: 886-3-5788833
http://www.gmt.com.tw
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