AD1888

a FEATURES AC ’97 2.3 COMPATIBLE FEATURES 6 DAC Channels for 5.1 Surround 90 dB Dynamic Range 20-Bit PCM DACs S/PDIF Output Integrated Stereo Headphone Amplifiers Phone, Aux, and Line-In High Quality CD Input Selectable MIC Input Mono Output External Amplifier Power-Down Control Double Rate Audio (fS = 96 kHz) Power Management Modes 48-Lead LQFP and 48-Lead LFCSP Packages AC ’97 SoundMAX Codec AD1888 ® ENHANCED FEATURES Selectable Front and Rear MIC Inputs with Preamp Integrated PLL for System Clocking Crystal-Free Operation Variable Sample Rate 7 kHz to 96 kHz Jack Sense (Auto Topology Switching) Software Controlled VREF_OUT for MIC Bias Software Enabled Outputs for Jack Sharing Auto Down-Mix and Channel Spreading Modes FUNCTIONAL BLOCK DIAGRAM MIC1 MIC2 PHONE_IN CD_L CD_R AUX_L AUX_R LINE_IN_L LINE_IN_R AD1888 G XTAL_IN XTAL_OUT PLL DIFF AMP G M 16-BIT ⌺-⌬ ADC G M 16-BIT ⌺-⌬ ADC ADC SLOT LOGIC ID0 ID1 AC '97 INTERFACE RESET SYNC GA M GA M GA M GA M GA M GA GA M M AC '97 CONTROL REGISTERS GA M GA MONO_OUT M A M BIT_CLK SDATA_OUT DAC SLOT LOGIC M GA 20-BIT ⌺-⌬ DAC 20-BIT ⌺-⌬ DAC SDATA_IN LINE_OUT_L MZ A LINE_OUT_R MZ A M GA SPDIF TX SPDIF_OUT M M M M M M 20-BIT ⌺-⌬ DAC 20-BIT ⌺-⌬ DAC EAPD M GA EAPD CENTER_OUT MZ A LFE_OUT MZ A M G = GAIN A = ATTENUATION M = MUTE Z = HIGH-Z M GA GA JACK SENSE LOGIC VOLTAGE REFERENCE JS0 JS1 VREF VREFOUT SURR_L/ HP_OUT_L SURR_R/ HP_OUT_R HP M A 20-BIT ⌺-⌬ DAC 20-BIT ⌺-⌬ DAC HP M A M GA REV....