G1412 Global Mixed-mode Technology Inc. Ground-Reference Popless Stereo Headphone Driver Features General Description 7mA Quiescent Current. Ground-Referenced Outputs Eliminate DC-Bias Voltages on Headphone Ground Pin Popless Function Embedded 70mW Per Channel into 16Ω loads Low Distortion Large Output Voltage Swing. ±1.8V to ±3.6V Dual Power Operating Range Low Power Consumption. Over-Temperature Protection UVLO Embedded TDFN2X2-8 &TQFN3X3-16 Packages The G1412 stereo headphone driver is designed for portable equipment where board space is limited. The G1412 uses the dual external power supplies PVDD/NVDD to produce a ground-reference output, eliminating the need for large DC-blocking capacitors, saving cost, board space, and component height. The G1412 is a dual channel, low voltage, low power, and high performance amplifiers, which can deliver up to 70mW per channel into a 16Ω load with small THD+N performance. The G1412 operates from a dual ±1.8V to ±3.6V supplies, consumes only 7mA of supply current. With excellent AC performance (small THD), it can be designed into a wide range of headphone driving application. Applications Cellular Phone Notebooks PDAs MP3 Players Portable Audio Equipment Ordering Information ORDER NUMBER TEMP. RANGE MARKING PACKAGE (Green) G1412RC1U 1412 -40°C ~ +85°C TDFN2X2-8 G1412R41U 1412 -40°C ~ +85°C TQFN3X3-16 Note: RC :TDFN2X2-8 1: Bonding Code U: Tape & Reel REMARK OBSOLETE R4:TQFN3X3-16 Pin Configuration Typical Application Circuit G1412 PGND 1 OUTL 2 NVDD 3 OUTR 4 Thermal Pad 8 PVDD 7 INL 6 INR 5 SHDN RF RI TDFN2X2-8 NC NC NVDD NC 12 11 10 9 3 4 INL 16 SVDD SHDNL Thermal Pad 2 PVDD 15 SGND 14 1 NC 8 INR 7 OUTR 6 SVSS 5 OUTL LEFT AUDIO OUTPUT + RI 13 SHDNR PGND LEFT AUDIO INPUT + RIGHT AUDIO INPUT GAIN = - ( RF RI RIGHT AUDIO OUTPUT ) RF G1412 TQFN3X3-16 Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. Ver: 1.5 Sep 30, 2009 TEL: 886-3-5788833 http://www.gmt.com.tw 1