Biforst Technology Inc. Make Sounds in Pure Digital Operation Voltage Range： Digital Amp：3.0 ~ 3.6V Speaker Driver：3.0 ~ 5.5V Operation Frequency Range： 11.2896MHz (When In CD 44.1KHz Sample Rate) 12.288MHz (When In DAT 48KHz Sample Rate) Sample Rate x 256 Support I2S, Left-Justified & Right-Justified Audio Data Input Interface Two-Channel Speaker Driver (1W at 5V each channel) BTL Functions: Two-Channel Speaker Driver Switch to Mono Output Can Select One Of Two Channels As Input Signal Driving Capacity Up to 1.5W at 5V Audio Volume Control： 32-Level Digital Audio Volume Control HSOP 28pin Benifits The longest sustained battery life with least heat dissipation of speaker driving system Exactly suitable Note-book/Desktop PC/LCD Monitor/TV Surround Sound Systems, Portable DVD/VCD/CD/MP3 Speakers and Headphones and Video Game Speakers Need low supply current ( < 1μA ) at 5V while no audio sound output Auto-Mute function while no digital audio input Allow both speaker driving and headphone driving on system No need gain setting (built-in 32 level digital volume control) With minimum external components and minimum power consumption while driving speaker Introduction The BI2008 is a stereo pure digital audio power amplifier single chip IC in a HSOP 28 Pins Package with bridge- tied- load (BTL) function. As a pure digital audio amplifier chip, The BI2008 allows digital audio source directly enter into amplifier chip, and connect to speakers without the use of external filter. It improves obviously in distortions, which come from A/D or D/A converters, and also in power efficiency. The advantages described above cause much better audio quality with longer sustained battery life to be the best choice for USB-powered speaker, Note-book, portable audio entertainment or portable DVD. Unlike other class-D amplifier chips with analogue input, BI2008 can accept three digital input interfaces (I2S, Left- Justified, Right-Justified). The design minimizes the input RC components and the power consumption of inside OP Amp. Simply for hearing, the maximum output of the BI2008 can be the same of traditional class AB output 4W per channel with 4Ω speakers. In fact, the maximum output of this digital amplifier is only 1 W per channel under 4Ω load with VDDA = 5V. The BI2008 can never trigger the USB’s over-current protection mechanism on PC or Notebook under normal operation. Even adding USB controller IC, the power consumption with loudest volume is operated at VDDA = 5.3V. While auto mute is active, the audio output will be completely disable and the power consumption Idd current will be reduced < 1μA. This auto mute function does save the system’s power. Biforst Technology Inc. 8F-3, No.26, Tai Yuen St., Jubei City, Hsin-Chu, Taiwan, R.O.C. Tel: 886-3-552-6521Fax: 886-3-552-6558 Email: [email protected] 豪發科技股份有限公司 302 新竹縣竹北市台元街 26 號 8 樓之三 電話: 886-3-552-6521 傳真: 886-3-552-6558 電子郵遞: [email protected]