G1450 Global Mixed-mode Technology Inc. 2.4W Stereo Audio Amplifier with DC Volume Control Features 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 system 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 applications, the shutdown mode is supported to disable the G1450 when it is idle. The current consumption can be reduced below 1µA. 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 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 protection circuitry is implemented to avoid unintentionally damaging. Applications Notebooks LCD Monitor or TV Ordering Information ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Pb free) G1450F81U G1450 -40°C to +85°C SOP-16 (FD) Note: F8: SOP-16 (FD) 1: Bonding Code U: Tape & Reel Pin Configuration G1450 MUTE 1 16 ROUT- SHUTDOWN 2 15 VDD 14 ROUT+ 13 SE/BTL RIN- 3 BYPASS 4 GND 5 LIN- Thermal Pad 12 GND 6 11 LOUT+ VOLUME 7 10 VDD VOLMAX 8 9 LOUT- SOP-16 (FD) Note : Recommend connecting the Thermal Pad to the GND for excellent power dissipation. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.0 Dec 14, 2010 1