PT8914 USB Speaker Controller with Class D Amp. DESCRIPTION The PT8914 is a cost-efficient single chip for USB speaker application. It integrated USB controller, 16 bit audio DAC and high power, high efficient Class-D audio amplifier in one chip. Only few external components needed in application circuits makes it suite for the USB powered speaker system. The I/O interface is totally follow the USB audio class specification, no special driver software needs to install on user’s computer and support most popular Operating System in the recent market. The PT8914 is a truly plug and play USB audio device. The embedded GPIO pins provide the mute and volume adjustment functions. FEATURES • Compliant with USB2.0 full speed specification. • Compliant with USB Audio class specification. • Compliant with USB HID class specification for volume, mute remote control. • Supply voltage: 4.5~5.5V • Built-in class-D audio amplifier with 1Watt output power for each channel. • Built-in PLL (48MHz for USB) • Key pad control for mute, volume up and volume down. • Packages: 24 pins SOP APPLICATION • USB Speaker BLOCK DIAGRAM Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan PT8914 APPLICATION CIRCUIT V1.2 2 December 2009 PT8914 ORDER INFORMATION Valid Part Number PT8914-S Package Type 24 Pins, SOP, 300mil Top Code PT8914-S PIN CONFIGURATION PIN DESCRIPTION Pin Name USBDP USBDM Vreg Test GND Vref VDD2 DACOR VOLINR VOLINL DACOL MUTE VOLUP/DN OUTLP GNDL VDDL OUTLN OUTRN VDDR GNDR OUTRP OSCO OSCI VDD1 V1.2 I/O I I Power I power Power Power O I I O I I O Power Power O O Power Power O O I Power Description Pin No. USB data plus 1 USB data minus 2 Regulator 3.3V power 3 Tie to high, tie to low to issue remote wake up signal 4 DAC ground 5 Reference voltage 6 DAC power 7 DAC output right channel 8 Volume in right channel 9 Volume in left channel 10 DAC output left channel 11 GPIO, Mute 12 GPIO, Volume up/down 13 Left channel positive output 14 Left channel ground 15 Left channel power 16 Left channel negative output 17 Right channel negative output 18 Right channel power 19 Right channel ground 20 Right channel positive output 21 Output for 12MHz oscillator 22 Input for 12MHz oscillator 23 USB 5V power 24 3 December 2009 PT8914 IMPORTANT NOTICE Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and to discontinue any product without notice at any time. PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No circuit patent licenses are implied. Princeton Technology Corp. 2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan Tel: 886-2-66296288 Fax: 886-2-29174598 http://www.princeton.com.tw V1.2 4 December 2009